Quick Die Change

Hydraulic Clamping and Lifting

Hydraulic Nut Clamps

Use Nut Clamps with dies having slotted die plates or U-Slot brackets.

Use Nut Clamps with dies having slotted die plates or U-Slot brackets.

When to Use Nut Clamps:

nut-clamps-pg4-graphic2Use Nut Clamps with dies having slotted die plates and enough clearance for the Nut Clamp body (see chart). U-Slot brackets or ears may also be added to dies in some applications.

If systems are setup to have hydraulics removed during stamping, Hydra Mechanical (L style) clamps (with a mechanical lock) should be selected. If a dedicated hydraulic system is considered, the Fully Hydraulic clamps (with either multiple upper zone control or check valves) may be the preferred choice.

Clamp model and quantity should be selected to provide a total clamping force greater than the total (static and dynamic) force applied to the system during use.

 

How They Work:

nut-clamps-pg4-graphic3Nut Clamps are moved into position in a slot in the die plate (gaps between clamp and die/slot allow movement). When hydraulic pressure is applied, the clamp pulls upward on the T-bolt and the clamp body moves downward to clamp the plate. Hydraulic pressure is maintained during operation, or the Locking Nut (L style) is engaged to allow removal of clamp hydraulic pressure during stamping. To unclamp, hydraulic pressure is removed and clamps open under internal spring force. (Note: Reapplication of hydraulics is required to unlock the Locking Clamps (L) prior to releasing pressure and unclamping).

Hydraulic Ledge Clamps

Use Ledge Clamps (Fixed Clamp Height Rocker Clamps) with dies having a clamp plate that sticks out from the die body or has a large slot.

Use Ledge Clamps (Fixed Clamp Height Rocker Clamps) with dies having a clamp plate that sticks out from the die body or has a large slot.

When to Use Fixed Clamp Height Rocker Clamps

Ledge-ClampsUse Fixed Clamp Height Rocker Clamps with dies having an open ledge clamp plate or a slot in the die large enough to accommodate the clamp nose for full clamp engagement. Ledge brackets, bars, or ears may also be added to dies in some applications to accommodate the clamps and/or plates milled to set a common clamp height.

If systems are setup to have hydraulics removed during stamping, Hydra Mechanical (L style) clamps (with a mechanical lock) should be selected. If a dedicated hydraulic system is considered, the Fully Hydraulic clamps (with either multiple upper zone control or check valves) may be the preferred choice.

Clamp model and quantity should be selected to provide a total clamping force greater than the total (static and dynamic) force applied to the system during use.

How They Work:

Ledge-Clamps2Ledge Clamps are moved into position with the lower body stop set against the die plate (gaps between clamp and die/slot allow movement) or may be permanently mounted on one side to act as a side stop.

When hydraulic pressure is applied, the clamp nose moves downward onto the plate, clamping the die. Hydraulic pressure is maintained during operation, or the Locking Nut (L style) is engaged to allow removal of clamp hydraulic pressure during stamping. To unclamp, hydraulic pressure is removed and clamps open under internal spring force. (Note: Reapplication of hydraulics is required to unlock the Locking Clamps (L) prior to releasing pressure and unclamping).

Hydraulic Adjustable Rocker Clamps

Use Adjustable Rocker Clamps with dies having a cutout clamp position, narrow slot, extended clamp plate and/or variable clamp plate thickness.

Use Adjustable Rocker Clamps with dies having a cutout clamp position, narrow slot, extended clamp plate and/or variable clamp plate thickness.

When to Use Adjustable Rocker Clamps:

Use Adjustable Rocker Clamps with dies having a cutout clamp position, narrow slot in the die or for typical clamp plate applications with variable clamp plate thickness across several dies. Also, ledge brackets, blocks, bars, or ears may be added to dies in some applications to accommodate the clamps and/or small slots cut into the dies to accept the smaller clamp nose.

If systems are setup to have hydraulics removed during stamping, Hydra Mechanical (L style) clamps (with a mechanical lock) should be selected. If a dedicated hydraulic system is considered, the Fully Hydraulic clamps (with either multiple upper zone control or check valves) may be the preferred choice.

Clamp model and quantity should be selected to provide a total clamping force greater than the total (static and dynamic) force applied to the system during use.

How They Work:

The Adjustable Rocker Clamps are moved into position with the lower body stop set against the die plate (gaps between clamp and die/slot allow movement).

The center height adjustment knob is turned clockwise until the nose of the clamp touches the clamp plate.

When hydraulic pressure is applied, the clamp nose moves downward onto the plate, clamping the die. Hydraulic pressure is maintained during operation, or the Locking Nut (L style) is engaged to allow removal of clamp hydraulic pressure during stamping. To unclamp, hydraulic pressure is removed and clamps open under internal spring force. (Note: Reapplication of hydraulics is required to unlock the Locking Clamps (L) prior to releasing pressure and unclamping). After the clamp is released, the adjustment knob is turned to further open the clamp, as desired.

Hydraulic C Clamps

PFA_082808_03

Hydraulic, Fixed Clamp Height, Sliding Style C Clamp

“C” Clamps work in similar applications to our fixed height ledge clamps, but provided a different profile and customer preference. Using small Bolt-on guides, these clamps also work well in “slotless” press applications (bolsters with threaded holes only). Also, by reaching under and over the clamping plate and providing multiple ports, the clamp can be set “deeper” over the plate if needed, resulting in a lower installed profile.

Available in the single piston style Model 283 and double piston style Model 283D, “C” clamps require only 1.25″ to 1″ of die plate engagement, respectively, and may be modified at the nose to engage plates that have been pocketed to match clamp heights. Ledge brackets, bars, or ears may also be added to dies in some applications to accommodate the clamps. Clamp model and quantity should be selected to provide a total clamping force greater than the total (static and dynamic) force applied to the system during use.

Clamp sizing is done to provide a minimum .060″ clearance to the clamp plate and accommodate a wide range of slot neck height and clamp plate height combinations. For a given T-slot neck depth (N) and clamping plate height (CLH) the needed part number can be easily determined.

Hydraulic Die Lifters/Rollers

Use Hydraulic Die Lifters for effort free lifting of medium and heavy duty dies.

Use Hydraulic Die Lifters for effort free lifting of medium and heavy duty dies.

When to Use Hydraulic Die Lifters:

Use hydraulic die lifters when die weights are typically standard for medium to large presses. Dies with a small footprint relative to the die weight will typically require Hydraulic Die Lifters.

In addition to a large lifting force, hydraulic actuation allows for easy and controlled movement of the die only when desired, in contrast to spring loaded lifters, typically used in light die applications.

Inline rollers provide for movement along the rail and transverse rollers for movement 90 degrees to the slot direction. Ball roller rails allow for movement in any direction but are generally more limiting in overall die weights.

How they are used:

Hydraulic Die Lifter Rails are secured in the slots via the included mounting bracket. Stand offs ensure the rails are captured in the slots, yet move freely up and down prior to die insertion.

The rails are activated using a PFA Hydraulic Control Unit, placing them in the “lifted” position. The die is then inserted by “rolling” into the press and lowered by rotating the control valve to the “lower” position (venting pressure). After insertion, the die may be indexed into position using an additional pair of transverse rollers lifting the die, alternating use of the transverse lifters and inline lifters, using a single pair of ball roller rails, or by other means.

Hydraulic Power Units for Clamps and Rails

Quick Die Change QDC Hydraulic Clamp Control Quick Die Change QDC Hydraulic Clamp Control High Pressure Hydraulic Control Units (HC) are powered with commonly available air pressure and are made in a variety of configurations to optimize all QDC applications. From single valve (zone) carriables to multi-valve units, we’ve got just what you need to get the job done. Here’s a summary.

Hydra-Mechanical (HM) clamps, also known as locking clamps, are hydraulically actuated and then mechanically locked during press operations. They need to be re-pressurized in order for the mechanical locks to be released. HM in the module part number indicates the addition of a hydraulic pressure booster button to make unlocking simple and easy.

Hydraulic Die Lifter Rails provide exceptional lift capacity, but need to be lowered prior to clamping. DL in the part number indicates the addition of a pressure relief valve to help protect the rails in the event dies are clamped before rails are lowered.

Smaller carriable power units are designated as (C) while the larger stationary units can be ordered as Stationary (S) for your own mounting or Mounting Bracket (B), Stationary Pedestal (P) or Rolling Stand (R).

For systems employing hydraulic only (non-locking) clamps it is necessary to, as a minimum, cross connect Ram Clamps with half of them to a separate zone and provide connections to the press control to stop the press on loss of system pressure. Maintaining dedicated controller connections and using the Pressure Switch (PS) option is minimally required/recommended.

MODELCONFIGURATION OPTIONS
HMHydra-Mechanical Clamps
DLDie Lifter Dedicated Zone with Overpressure Relief
PSPressure Switch
SStationary
CCarriable
RRoll-Around
PPedestal
BBracket

Air Lifting Systems

Quick Die Change QDC Air Lifter Rail

When to Use Pneumatic Die Lifters:

Use pneumatic die lifters for lighter dies in small to medium presses. Load capacity is approximately 1/2 of a hydraulic rail for inline cylindrical rollers and similar in lift force for the multi-directional ball rollers, but slot size can be much smaller and overall cost much lower. In many applications, performance is astounding. Fitting in slots as small as 1.250” total depth, very large lift capacities are produced with readily available 85 psi shop air. 1,800 lbf/ft/pair for narrow rails and 2,600 lbf/ft/ pair for wide rails is exceptional performance. Using shop Air eliminates the need for hydraulics and the associated complexities of adding hydraulic systems to the press.

Simple hand operated air valves (or electrically operated valves integrated with other press controls) can be used to actuate the lifters. For an available off the shelf air interface that connects to shop air and provides a Manual Hand Valve, Filter Regulator, and Lockout system, please see information PFA’s Air Package (DA-AP). Designed for standard ¾” and 1” T slots and available to accommodate any press bolster depth, PFA Pneumatic Die Lifters provide a low cost, easy to order, and simple to install option to be used in standalone or integrated applications. Simply add clamps and/or bolster extensions for a complete QDC system.

How They are Used:

Pneumatic Lifting bars with installed rollers are inserted into the T slots and captured between the separate air lift system installed on the front of the press and the guard attached to the back side of the T slot. The air lift bag or hose occupies the space under the rail in the wider slot section providing the lift force when pressurized. If the rail is sized shorter than the slot, a filler bar is added to maintain rail position in the slot. Rails are made to specific dimensions to match the T-slot and achieve the desired lifting height.

Air rail lifting height is specified by the customer to match the insertion height of other components, such as bolster extensions. Activating with 85 psi air, places the lifter “up” ready to receive the die. The die is loaded with the weight transferring from the bolster extensions to the lifters. Once the die is in the press, the lifters are lowered by closing the supply pressure and venting the lines (typically the valve both secures and vents the line).

Systems are provided with rails, guards, the pneumatic fittings, and hose to connect them together along with a relief valve. Customers provide any desired control valves for air and connect to an NPT port or may purchase an “Air Package” consisting of Lockout, Manual Valve, and Filter Regulator for easy integration.

Mechanical Clamping - Lifting - Extensions

Mechanical Quick Set Clamps

quick-set-clamp-photo

When to Use 1/4 Turn Quick Set Clamps:

Use mechanical quick set clamps with dies having slotted die plates and enough over slot clearance for the set clamp body.  U-Slot brackets or ears may also be added to the dies or a heel block added to the back of the clamp for some applications.

How they work:

To use, move clamp into position and manually hand tighten nut using the large diameter knurled surface.  Use a wrench to torque to the desired preload.  The large bronze alloy nut acts as an easy turning, anti-galling, large surface thrust bearing arrangement for superior performance.

Model 255 clamps require approximately 125 ft.-lbs. of torque to preload the clamp to 10,000 lbs. clamping force.  Model 259 clamps require approximately 350 ft.-lbs. to preload clamp to 20,000 lbs. clamping force (unlubricated threads).  Clamp preload should be limited to 20,000 lbs. and 40,000 lbs. respectively.

Options and features:

ARA vs. FRA.  Free Rotation (FRA) clamps use standard threaded bolts, while Anti-Rotation (ARA) models use modified threads to prevent the clamping plate from spinning about the bolt.

TSB vs. STN.  Forged T-Slot Bolts (TSB) are standard for production units.  In the case where a larger than standard clamp range is desired, the stud and T-Nut option (STN) is available.

HB Option.  In cases where customers desire to use the clamp in applications without slotted die plates, a heel block may be added to the clamp to support the back of the clamp.  (Clamping force is 50% of rating.)  For this option specify HBX.XX at the end of the part number.  (X.XX = clamping plate height in inches.)

Nut Retention Option.  In cases where customer desires to prevent the nut from coming off the bolt.  A stop mechanism is added to the top of the bolt.  Use TSL in place of TSB in the part number for this option.

Mechanical/Portable Die Lifters/Rollers

die-lifters-rollers

When to Use:

Stationary Spring Loaded Die Lifter Rails.  Providing multi-directional movement, these rails are used for medium to lightweight dies when die density is low.  They are also used when the need for mechanical only or unique layouts drive the decision process.  Springs automatically lift die when clamping is removed from the die.

Stationary Spring Loaded Ball Cartridges.  Installing an array of single ball cartridges also provides multi-directional die movement without operator involvement.  Cartridges can be placed anywhere in the bolster to avoid taking up slots needed for clamps.  Cartridges work great in
Non-Slotted Bolster applications.

Portable Die Lifters.  Hand operated lifters work well with common slots among presses, providing maximum ROI by allowing a single set of lifters to serve die changes on an entire group of presses.

How they work:

Spring loaded ball cartridges and spring loaded die lifter rails are permanently installed in the bolster.  During clamping, the clamp force compresses the springs and forces the balls below the surface.  When clamps are released, the spring forces lift the balls and the die with them.  The die is now ready for removal/repositioning.

Portable die lifters provide a large mechanical advantage by multiplying hand/handle motion to lift the die.  The large lever action easily lifts the die for either (1) die lifting only – insert in slot and lift the die allowing the die to be rolled onto a cart, etc. or (2) die lifting and movement onto a bolster extension, allowing die pickup with forks.

Bolster Extensions

bolster-extensions

bolster-extension-diagram
Unlimited Options. Bolster Extensions are available in a variety of types: lift-off, swing-away, detachable, traveling and slotless. PFA can easily customize mountings to meet most applications and can even provide complete custom solutions.

Fast and Easy. Cylindrical rollers on Bolster Extensions typically reduce the force necessary to move a die to about 1 to 3 percent of die weight. Moving the die into the press becomes fast and easy. Loading and unloading dies from Bolster Extensions is also easily done by forklift or crane, making extensions essential components of many Quick Die Change (QDC) systems.

Modular. By reviewing multiple press needs at one time, common QDC components can be selected. Bolster Extensions can often be used on more than one press, greatly saving on the per press cost of QDC.

Hydraulic Cylinder Style Nut Clamps

The Hydraulic Nut Clamps cover three basic sizes based on clamp force,  Model 205 at 8,000 lbf, Model 200 at 10,000 lbf, and Model 201 at 15,000 lbf.  The “Locked” designation (L) is added to the model number for the Locking screw that can be used to secure the clamp in position so Hydraulics can be removed during stamping.  Locking clamps are commonly referred to as Hydra-Mechanical Clamps (HM) as they are hydraulically clamped and mechanically locked.

After selecting the model and Locking if desired, the clamp part number is built up based on the model number and then the clamping plate height or clamp height (CLH) and T-slot size.  The clamping height is sized in ¼” increments for the small clamp heights and ½” increments above 2.00”.  Note that these types of clamps are designed to clamp on a plate when close to the clamp plate.  For varying clamp plate heights the clamp must be threaded up or down the threaded stud to achieve the starting clamp position close to the clamp plate and snug in the T-slot prior to clamping.

Fundamentally these clamps should not be adjusted in height without careful consideration of proper thread engagement in the Nut clamp and adequate stroke of the clamp to take up gaps between components.  See the specific Nut Clamp User Guide and/or Specification Drawing for details on recommended gaps and heights.

For selecting the appropriate components to achieve catalog clamping height (CLH), PFA assumes standard JIC T-Slot dimensions to fit the T-Slot and typically Neck height is assumed as .750” for 5/8” slot, .875” for 3/4” slot, 1.000” for 1” slot.

Standard Configurations
QDC hollow cylinder nut clamp part dimensional information PFA SMED
Model 200/200LModel 201/201LModel 205/205L
Bolster/Ram InterfaceT-Slot ¾” or 1”Threaded Hole (TH)T-Slot 1” onlyT-Slot ⅝”, ¾” or 1”Threaded Hole (TH)
Clamping Force at 5,000 PSI10,000 lbs.15,000 lbs.8,000 lbs.
Clamping Stroke.29”.60”.25”
Standard Thread Size¾” – 10Hole Size*** ⅝” – 11×1.85 minimum1” – 8⅝” – 11Hole Size*** ½” – 13×1.85 minimum
A2.50”3.12”2.00”
BFull Hydraulic (without lock)2.20”3.00”3.50”2.00”2.65”
Hydra Mechanical (L) (with lock)3.20”4.00”4.90”3.00”3.65”
D**CLH*
.50”
.75”
1.00”
1.25”
1.50”
1.75”
2.00”
2.50”
**
No Lock
3.50”
3.50”
4.00”
4.00”
4.50”
4.50”
5.00”
5.50”
**
Lock (L)
4.00”
4.25”
4.50”
4.75”
5.00”
5.25”
5.50”
6.00”
**
No Lock
3.50”
3.75”
4.00”
4.25”
4.50”
4.75”
5.00”
5.50”
**
Lock (L)
4.50”
4.75”
5.00”
5.25”
5.50”
5.75”
6.00”
6.50”
**
No Lock
4.00”
4.25”
4.50”
4.75”
5.00”
5.25”
5.45”
5.95”
**
Lock (L)
6.00”
6.25”
6.50”
6.75”
7.00”
7.25”
7.50”
8.00”
**
No Lock
3.25”
3.25”
3.75”
3.75”
4.25”
4.25”
4.75”
5.25”
**
Lock (L)
3.75”
4.00”
4.25”
4.50”
4.75”
5.00”
5.25”
5.75”
**
No Lock
3.15”
3.40”
3.65”
3.90”
4.15”
4.40”
4.65”
5.15”
**
Lock (L)
4.15”
4.40”
4.65”
4.90”
5.15”
5.40”
5.65”
6.15”
**
Weight3.0 lbs.5.0 lbs.8.5 lbs.2.0 lbs.3.0 lbs.
nut-clamp-chart-image-1nut-clamp-chart-image-2nut-clamp-chart-image-3nut-clamp-chart-image-4nut-clamp-chart-image-5nut-clamp-chart-image-6nut-clamp-chart-image-7nut-clamp-chart-image-8nut-clamp-chart-image-9nut-clamp-chart-image-10

*Clamp Height (CLH) based on standard JIC T-Slot dimensions. T-Slot dimensions are typically: (Neck height is .750” for 5/8” slot, .875” for 3/4” slot, 1.000” for 1” slot).

**D=Product height installed is related to clamp height needed for clamp plate thickness. Stock sizes listed, but others are easily available. Dimension is worst case based on the smallest slot neck height and includes 1/4” clearance for slot variation.

***For TH models, threaded rod will engage bolster 1.3” minimum and range from 1.35” to 1.75” typical. If application is unique, call PFA for assistance.

Identify Your Part Number

Example: 13,000 lb. die typically uses a 15,000 lb. clamp such as Model 201. Clamp plate thickness (CLH) is 1.0”. 1” T-Slot.

QDC hollow cylinder nut clamp part number specification PFA SMED

Hydraulic, Fixed Clamp Height, Rocker Style Ledge Clamps

Hydraulic Ledge Clamps are separated into single clamps and double clamps with the single clamps taking up a single T-slot (Models 425 and 428) and double clamps taking up two slots (Models 126 and 128).   Double clamps provide for significant force at 22,000 lbf and 26,000 lbf respectively, however distance between slots is specifically 12 inches and cannot be changed.  For large retrofit applications and medium force applications is it typical to use multiples of the single T-slot clamps Model 425 at 8,000 lbf clamp force and Model 428 at 10,000 lbf clamp force.

The “Locked” designation (L) is added to the model number for the Locking screw that can be used to secure the clamp in position so Hydraulics can be removed during stamping.  Locking clamps are commonly referred to as Hydra-Mechanical Clamps (HM) as they are hydraulically clamped and mechanically locked.  Units are also available with a handle to make moving the clamps easy for operators.

After selecting the model and Locking/Handle options, the clamp part number is built up based on the model number and then the clamping plate height or clamp height (CLH) and T-slot size.  The clamping height is sized in ¼” increments for the small clamp heights and ½” increments above 2.00”.  Note that these types of clamps are designed to clamp on a plate height that is fairly consistent as the clamping stroke of the clamp is designed to accommodate variations in T-slot to T-Nut gap and some gap to slide the clamp into position.  Fundamentally these are not adjustable clamp height clamps.  See Nut Clamps or Adjustable Rocker Clamps for clamps designed to accommodate moderate variations in clamp plate thickness.

For selecting the appropriate components to achieve catalog clamping height (CLH), PFA assumes standard JIC T-Slot dimensions to fit the T-Slot and typically Neck height is assumed as .750” for 5/8” slot, .875” for 3/4” slot, 1.000” for 1” slot).  See the specific Rocker Clamp User Guideand/or Specification Drawing for details on recommended gaps and heights.

Standard Configurations
QDC fixed height ledger rocker clamp dimensional information PFA SMED
Model 425Model 425LModel 428Model 428LModel 126Model 126LModel 128Model 128L
Clamping Force at 5,000 PSI8,000 lbs.10,000 lbs.22,000 lbs.26,000 lbs.
T-Nut SpacingN/AN/A6”6”
A4.25” no handle
4.50” with handle
4.25” no handle
4.50” with handle
12”12”
B**CLH*
.50”
.75”
1.00”
1.25”
1.50”
1.75”
2.00”
2.50”
**
No Lock
2.75”
2.75”
2.75”
3.00”
3.25”
3.50”
3.75”
4.25”
**
Lock (L)
4.25”
4.25”
4.25”
4.50”
4.75”
5.00”
5.25”
5.75”
**
No Lock
3.75”
3.75”
3.75”
3.75”
4.00”
4.25”
4.50”
5.00”
**
Lock (L)
4.25”
4.25”
4.25”
4.25”
4.50”
4.75”
5.00”
5.50”
**
No Lock
2.75”
2.75”
2.75”
3.00”
3.25”
3.50”
3.75”
4.25”
**
Lock (L)
4.25”
4.25”
4.25”
4.50”
4.75”
5.00”
5.25”
5.75”
**
No Lock
3.75”
3.75”
3.75”
3.75”
4.00”
4.25”
4.50”
5.00”
**
Lock (L)
4.25”
4.25”
4.25”
4.25”
4.50”
4.75”
5.00”
5.50”
**
CJaw Opening to Match CLH* + .18” gapJaw Opening to Match CLH* + .18” gapJaw Opening to Match CLH* + .18” gapJaw Opening to Match CLH* + .18” gap
D4.00” no handle
7.25” with handle
4.75” no handle
7.25” with handle
4.00” no handle
7.25” with handle
4.75” no handle
7.25” with handle
E.88” Max.1.14” Max..83” Max1.12” Max.
Weight (approx.)8 lbs.12 lbs.25 lbs.35 lbs.
ledge-clamp-chart-image-1ledge-clamp-chart-image-2ledge-clamp-chart-image-3ledge-clamp-chart-image-4ledge-clamp-chart-image-5ledge-clamp-chart-image-6ledge-clamp-chart-image-7ledge-clamp-chart-image-8

*CLH= Clamping height – Nominal Clamp Plate Thickness based on clamping plate being within 0.030” of nominal. Clamp plate may be thicker than CLH as desired but less than the 0.18” total gap available. Clamps are provided with “C” open dimension, which is the CLH + 0.18” gap to allow for an option of .090” die lifter rail clearance and .060”-.090” air clearance for moving clamp in and out of position – allows lifting and moving dies under open clamps if necessary. Difference between C dimension and Actual Clamping Height should not exceed 0.18” which is 1/2 of the 0.36” total stroke of the clamp. Clamping height is also based on standard JIC T-Slot dimensions for T-nut sizing. T-Slot dimensions are typically neck height .875” for 3/4” slot and 1.00” for 1” slot.

** B = Product Height Dimension is related to clamp height needed for clamp plate thickness. Stock sizes listed, but others are easily available. Allow 1/2” more for nominal variations.

***Handles (H) available on all models. Contact PFA for details.

Identify Your Part Number

Example: 8,000 lb. die. Use 8,000 clamp such as Model 425, clamp plate thickness (CLH) is 1.0” and has 3/4 T-Slot.
Locking (L) and Handle (H) are added directly after the main model number. Examples are 425, 425L, 425H and 425LH.

QDC fixed height ledger rocker clamp part number specification PFA SMED

Hydraulic "Ledge Like" and Narrow Style Adjustable Rocker Clamps

Standard Configurations
QDC adjustable rocker clamp standard configurations 835 image PFA SMED
Model 661    /    Model 661LModel 825    /    Model 825LModel 835    /    Model 835L
Clamping Force at 5,000 PSI3,500 lbs.8,000 lbs.17,000 lbs.
Stud Thread Size⅝” – 11¾” – 101” – 8
T-Nut/Slot Style¾” or 1”¾” or 1”1”
A5.25”7.5”9.6”
B1.75”2.50”4.00”
C**CLH*
1.0
2.0
3.0
*
Nominal Clamping Range
¾” – 1¼”
1¾” – 2¼”
2¾” – 3¼”
*
Nominal Clamping Range
⅞” – 1¾”
1⅞” – 2¾”
2⅞” – 3¾”
*
Nominal Clamping Range

1¼” – 2½”
2¼” – 3½”
*
D**CLH*
1.0
2.0
3.0

3.75”
4.75”
5.75”

4.75”
5.75”
6.75”

6.00”
7.00”
8.00”
E (Nose Over Plate).75”.87”1.00”
F (Width at Plate)1.10”2.00”2.60”
Weight (approx.)5 lbs.13 lbs.32 lbs.
rocker-clamps-chart-image-1rocker-clamps-chart-image-2rocker-clamps-chart-image-3

t-slot-bolt

*Nominal clamp height for part number selection. Actual clamp range for selected unit listed in chart. Customs available.

C** and D**= Product clamping range and height dimension is related to nominal Clamping Plate Thickness (CLH) chosen. Allow 1” height clearance for nominal variations and actuation.

Clamps are provided with T-Slot Bolt (A) or Fully Threaded Stud and T-Nut (B), depending on availability.

Identify Your Part Number

Example:  6,000 lb. die.  Use 8,000 clamps such as Model 825L, clamp plate thickness (CLH) is 1.0” and has 3/4 T-Slot.

QDC Adjustable Rocker Ledge Clamp for SMED part number specification
View/Download Hydraulic Adjustable Clamp Height Rocker Clamps (Narrow Ledge Like Clamps) User Guides:

Hydraulic, Fixed Clamp Height, Sliding Style C-Clamp

Standard Configurations
PFA C Clamp Hydraulic QDC SMED how to size
Model 283Model 283D
Clamp Force at 5,000 PSI6,700 lbs6,900 lbs.

 

Clamp Height CLHSlot Neck Depth (N) Range
.50”-.75”.75”-1.00”1.00”-1.25”.25”-1.50
¾”-50-75-100-125
1”-75-100-125-150
1¼”-100-125-150-175
1½”-125-150-175-200
1¾”-150-175-200-225
2”-175-200-225-250
**

*For a given N and CLH find the correct Dash No. or use H values (exact total clamp opening).
**Other sizes available. Please call PFA for details.

 

Dash No.H*
-501.560”
-751.810”
-1002.060”
-1252.310”
-1502.560”
-1752.810”
-2003.060”
-2253.310”
-2503.560
**
Identify Your Part Number

Example:  Application requires clamps with 6,000 lbs. clamp force.  T-slot is 3/4 and has a neck (throat) depth of .875”.  Clamp height (CLH) = 1”.  Enter top of chart with Neck Depth of .875” (.750-1.00) and side of chart with CLH value (1”) to obtain (-100) with an “H” value of 2.06”

PFA C Clamp Hydraulic QDC SMED specifications for Part number

Hydraulic Die Lifters / Rollers

How to Determine Available Die Lifter Rail Options

1. List out die sizes and weights. Calculate die load per foot, per pair of lift rails. (W=width in feet)
lifter-rail-dimension-1
Die 1 Weight ________ ÷ W = ________ lbs./ft./pair
Die 2 Weight ________ ÷ W = ________ lbs./ft./pair
Die 3 Weight ________ ÷ W = ________ lbs./ft./pair

Determine heaviest die per foot.
Heaviest die density lb./ft./pair = __________________

2. Measure T-Slot or Rectangular channel throat.
If A = .800 to 1.000, use Narrow Rails
If A = 1.000 to 1.25, use Wide Rails
If A = 1.25, contact PFA

3. For the heaviest die, check the number of available slots under the die: Number of available slots = _______________ (See Chart Below)

4. Take the die density from Part 1 and find the closest larger lbs./ft./pair from the chart below. Then move across the top to find your desired die lifter style keeping in mind the Narrow or Wide from Part 2 and the number of available slots from Part 3.

5. Record the rail model number and number of needed rails from the chart:
Model ___________________ Quantity _________
Model ___________________ Quantity _________
Model ___________________ Quantity _________

6. Select the Model you desire from the chart below.

7. For the selected model, confirm that the number of rails always supports the dies as follows:
[W ft.] x [Chart lbs./ft./pair] x [No. of Rails] / 2 = [Lift Capacity] >. [Weight lbs.]

Die 1 ______ x ______ x ______ ÷ 2 = ______ > ______
Die 2 ______ x ______ x ______ ÷ 2 = ______ > ______

Ensure lift capacity is greater than die weight.

lifter-rail-dimension-28. Use the Model Number and Bolster Length (V) to determine the rail length desired (see page 13). Lifter will be flush with the loading side and should be near the back side but less than length (V). (Continue with Step 9)

9. With the model and length determined, the profile and final shape of the rail must be calculated. Page 14 provides simple calculations to obtain the final information for the part number.

 

Note: Rail sizing is done for a nominal lift height of the die of approximately .060” – .080” above the bolster surface. If other heights above the surface are desired, contact PFA for easy sizing to those requirements.

Narrow Slot Wide Slot 
Die Density (lbs./ft./pair)Ball Rollers
317N/318N
(1,800 lbs./ft./pr.)
Cylinder Rollers
315N/316N
(1,800 lbs./ft./pr.)
Ball
317W/318W
(2,150 lbs./ft./pr.)
Rollers
315W/316W/322W
(4,000 lbs./ft./pr.)
Heavy Duty Rollers
327W/328W
(9,000 lbs./ft./pr.)
1,8002 Rails2 Rails
2,1503 Rails2 Rails2 Rails2 Rails
2,7003 Rails2 Rails3 Rails2 Rails
3,2254 Rails2 Rails3 Rails2 Rails
3,6004 Rails2 Rails4 Rails2 Rails
4,0005 Rails2 Rails4 Rails2 Rails
4,3005 Rails3 Rails4 Rails3 Rails2 Rails
4,5005 Rails3 Rails5 Rails3 Rails2 Rails
5,5006 Rails3 Rails5 Rails3 Rails2 Rails
6,000**********

**For large die densities, call PFA.

Model No.SlotRectangular
or T-Slot
Height
Low Profile
High Profile
LengthMax Load per foot
(lbs./ft./pr.)
Max Load Capacity
(lbs./pr.)
Rollers/ Pistons
(per rail)

Cylindrical Rollers

315N3/4” (.800)
Narrow
Rectangular1.495 (LP)
1.805 (HP)
9”
11”
14”
21”
24”
30”
33”
36”
40”
42”
45”
48”
54”
60”
66”
72”
84”
87”
90”
4,0003,000
4,000
4,000
7,000
8,000
10,000
11,000
12,000
13,000
14,000
15,000
16,000
18,000
20,000
22,000
24,000
28,000
29,000
30,000
04/03
05/04
05/04
08/07
09/08
11/10
12/11
13/12
14/14
15/14
15/15
18/16
20/18
22/20
24/22
26/24
28/28
29/29
30/30
rail-chart-image-1
316NT-Slot
315W1” (.995)
Wide
Rectangular
316WT-Slot
327W1” (.995)
Wide
Rectangular1.495 (LP)
1.805 (HP)
24”
30”
36”
42”
48”
54”
60”
66”
72”
78”
84”
96”
108”
120”
9,00018,000
22,000
27,000
32,000
36,000
40,000
45,000
49,000
54,000
58,000
63,000
72,000
81,000
93,000
16/08
20/10
24/12
28/14
30/16
34/18
38/20
42/22
46/24
50/26
54/28
60/32
68/36
72/40
rail-chart-image-2
328WT-Slot
322W1” (.995)
Wide
T-Slot1.495 (LP)
1.805 (HP)
24”
30”
36”
42”
48”
54”
60”
66”
72”
4,0008,000
10,000
12,000
14,000
16,000
18,000
20,000
22,000
24,000
14/08
18/10
22/12
26/14
30/16
34/18
38/20
42/22
46/24
rail-chart-image-3

Ball Rollers

317N3/4” (.800)
Narrow
Rectangular1.485 (LP)
1.720 (HP)
9”
10”
12”
19”
22”
24”
26”
29”
31”
33”
36”
39”
41”
44”
48”
50”
53”
58”
60”
62”
64”
66”
69”
72”
78”
1,8001,400
1,500
1,800
2,800
3,300
3,600
3,900
4,300
4,600
4,900
5,400
5,800
6,100
6,600
7,200
7,500
8,200
8,600
8,900
9,200
9,500
9,800
10,300
10,800
11,600
07/02
08/02
10/02
16/03
18/04
20/04
22/04
24/05
26/05
28/05
30/06
32/07
34/07
36/08
40/08
42/08
44/09
48/10
50/10
52/10
54/10
56/10
58/11
60/12
64/14
rail-chart-image-4
318NT-Slot
317W1” (.995)
Wide
Rectangular1.485 (LP)
1.720 (HP)
14”
19”
24”
29”
34”
39”
44”
48”
53”
58”
63”
68”
73”
78”
83”
88”
92”
2,1502,500
3,400
4,300
5,200
6,100
7,000
7,900
8,600
9,500
10,400
11,300
12,200
13,100
14,000
14,900
15,800
16,500
10/03
14/04
18/05
22/06
26/07
30/08
34/09
36/10
40/11
44/12
48/13
52/14
56/15
60/16
64/17
68/18
70/19
318WT-Slot

*Typical lengths – longer rails are available. Contact PFA for details.

Quick Die Change QDC Lifter Rail How to Size a Die lifter rail in a rectangular slot

How to Size a Rectangular Rail:

Recommended for all slots.
*Nominal .060” to .080” lift above surface of bolster.

1. Measure Slot Depth (ER) to center bottom:
ER = __________  (See chart on bottom of page 13)

2. Calculate amount of lift needed by piston to raise die desired amount (0.080*) for the chosen rail

ER + .080* – “H” (LP) = _______ Calculated Piston Stroke

3. Can piston stroke that much?
a. If calculated piston stroke is less than .36”, use LP in
part number and enter the calculated stroke.  STOP.

b.If piston stroke is larger than .36”, then try HP calculation:
ER + .080* – “H” (HP) = _______ Piston Stroke
If less than .36”, use HP in part number and
the calculated stroke

4. Verify lowered and raised positions fit slot for selected rail.
a. Is “H” less than (ER)?  If yes, ok.  If no, call PFA

b.Is (“H” – .080* + .36”) more than (ER)?
If yes, ok.  If no, call PFA

Quick Die Change QDC Lifter Rail How to Size a Die lifter rail in a T slot

How to Size a “T” Rail:

Only for T-Slots – See Page 13
*Nominal .060” to .080” lift above surface of bolster.

1. Measure Neck Height (D) and Full Width Depth (ET):
D = __________
ET = __________  (See chart on bottom of page 13)

2. Calculate amount of Flange Height for desired lift (.080*)

H (LP) – .080* – D = _______ Anticipated Flange Height

3. Is anticipated flange height adequate?
If flange is more than .25”, then ok.
If not, use calculation below for HP rail.
H (HP) – .080* – D = _______ Anticipated Flange Height
If more than .25”, ok.

4. Verify lowered and raised positions fit slot for selected rail.

a.Is “H” less than (ET)?  If yes, ok.  If no, call PFA

b.Is (“H” – .080* + .36”) more than (ET)?
If yes, ok.  If no, call PFA

Quick Die Change QDC Air Lifter Rail Part Number specification

** All flange and stroke dimensions are less than 1.000”, thus the decimal is omitted and fraction decimal entered.  For example, a .310” stroke is XXX=310.

*** Standard widths are shown as .800 and .995 for standard rails.  Use 0800 or 0995 for these units or other as desired.  For example, a 1.020 width is YYYY=1020.

For free sizing assistance and application support, please email or fax application dimensions and information to PFA.

Hydraulic Power Units for Clamps and Rails

Selection of the correct High Pressure Hydraulic Control Unit (HC) for the application should be done in consultation with your PFA representative.  Different options are selected to match installation kit requirements for cross connecting zones, check valves, die lifter reliefs, etc.

Feature summary for typical usage:

Option HM:  Hydra-Mechanical (HM) clamps, also known as locking clamps, are hydraulically actuated and then mechanically locked during press operations. They need to be re-pressurized in order for the mechanical locks to be released. HM in the module part number indicates the addition of a hydraulic pressure booster button to make unlocking simple and easy.

Option DL:  Hydraulic Die Lifter Rails provide exceptional lift capacity, but need to be lowered prior to clamping. DL in the part number indicates the addition of a pressure relief valve to help protect the rails in the event dies are clamped before rails are lowered.

Mounting Options C, S, B, P and R:  Smaller carriable power units are designated as (C), while the larger stationary units can be ordered as Stationary (S) for your own mounting or with a Mounting Bracket (B), Stationary Pedestal (P), or Rolling Stand (R).

Option PS:  For systems employing hydraulic only (non-locking) clamps, it is necessary to provide multiple zones to Ram Clamps for redundant sources of pressure.  Typical installation recommendations show half of the upper clamps interspersed or cross-connected on one zone and the remaining clamps on a separate zone to ensure 50% clamping force if one zone experiences an unexpected loss of pressure   The controller is also dedicated to the press and a pressure switch (PS) is added to the controller to provide integration with the press control to stop the press on loss of system pressure. Maintaining dedicated controller connections and using the Pressure Switch (PS) option is minimally required/recommended when using non-locking clamps.

Option PC:  Check valves to each clamp is also an option often requested by customers using non-locking clamps.  Each clamp has an inline pilot operated check valve and allows use of a single zone for all upper clamps.  To provide pilot pressure to open the clamps, an opening pilot circuit (PC) is added to the zone used to operate the upper clamps.

 

COMMON SPECIFICATIONS
  • Air inlet pressure/150 psi maximum/70 psi minimum
  • Oil temperature range of 50˚-120˚F
  • All hydraulic hose fittings are 37 flare
  • Internal air regulator is pre-set to approximately 70 psi for 5,000 psi hydraulic output to the clamps
  • 0-10,000 psi gauges for each circuit except electrically actuated module
  • Mechanical valves are low friction with metal to metal seals and check valves to isolate each hydraulic circuit. Electronic valves are 24 VDC poppet valves.

 

Part Combinations and Recommended Module Options
  • Hydraulic Die Lifters Only – Choose a single hydraulic circuit (1 zone) carriable module for convenient use and storage. Great for single or multiple systems. Example: HC-105C-DL
  • Hydra-Mechanical Locking Clamps Only – Choose a two hydraulic circuit (2 zone) carriable or larger roll-around module for greater convenience. HM booster is added for “L” clamp. Typically one hydraulic circuit is connected to the Ram Clamps and the other to the Bolster Clamps.  Example: HC-125C-HM; HC-120S-HM
  • Hydra-Mechanical Locking Clamps and Die Lifter Combination – Choose a three hydraulic circuit (3 zone) module when Hydra-Mechanical Locking Clamps and Die Lifters are used.  Example: HC-130R-HM-DL
  • Hydraulic-Only Clamps* – Choose a three hydraulic circuit (3 zone) module and cross connect top clamps to two separate zones. Since there are no locks, this will be a dedicated always connected controller with pressure sensing switch. Example: HC-130S-PS
  • Hydraulic-Only Clamps* with Die Lifters – Choose a four hydraulic circuit (4 zone) module when cross connecting a dedicated controller for non-locking clamps with Die Lifters.  Example HC-140S-PS-DL

* Clamps may also be secured with check valves to each clamp and operated with pilot control from the power unit Pilot Circuit (PC) option. Call PFA for details.

Mechanical Valve Power Units

HC-105C-DL

HC-105C-DL
one Zone, One Hydraulic Circuit With DL Option

This carriable unit is most often used to supply power to several machines. It may also be mounted for dedicated operation on a specific machine.

Weight25 lbs.
Reservoir Capacity2 1/2 qts.
Dimensions14"L x 9"W x 11"H

125C-HM Two Zone Two Hydraulic Circuits

HC-125C-HM
Two Zone, Two Hydraulic Circuits with HM Option

This carriable unit is most often used to supply hydraulic power to clamps which are mechanically locked during die operations. Two circuits are provided, one for the Ram Clamps and the other for the Bolster Clamps. It may also be mounted for dedicated operation on a specific machine.

Weight30 lbs.
Reservoir Capacity2 1/2 qts.
Dimensions14"L x 9"W x 11"H

HC-120P-HM TWO ZONE, TWO HYDRAULIC CIRCUITS WITH HM OPTIONS

HC-120P-HM
Two Zone, Two Hydraulic Circuits with HM Options

This unit is most often used for the same applications as the HC-125C-HM but dedicated to a single press or rolled to multiple presses. It is available in either the Stationary (S), Pedestal (P), Bracket (B) or Rolling (R) mounting configurations. Typically used with more complex configurations on custom applications, this unit is the first in the large box modules.

Weight55 lbs.
Pedestal/Base adds 40 lbs.
Bracket adds 10 lbs.
Roll Around adds 50 lbs.
Reservoir Capacity4 1/2 qts.
DimensionsCabinet Only: 21"L x 10"W x 16"H
Pedestal/Base: 29"H
Bracket: 14"L x 10"W x 6"H
Roll Around: 34"H

HC-130R-HM-DL

HC-130R-HM-DL
Three Zone, Three Hydraulic Circuits with HM and DL Options

This unit is most often used to supply hydraulic power to Hydra-Mechanical (HM) “Locking” Clamps and Die Lifters. Three circuits are available, one for the top Ram Clamps, one for the Bolster Clamps and a third which supplies hydraulic pressure to the Die Lifters (DL). The unit is placed on a pedestal attached to a base with easy rolling casters. It can also be placed on a customer supplied mount (HC-130S-HM-DL), a shelf bracket (HC-130B-HM-DL) or a pedestal (HC-130P-HM-DL).

Weight110 lbs.
Cabinet: 60 lbs.
Pedestal/Base adds 40 lbs.
Bracket adds 10 lbs.
Roll Around adds 50 lbs.
Reservoir Capacity2 1/2 qts.
DimensionsCabinet Only: 21"L x 10"W x 16"H
Pedestal/Base: 29"H
Bracket: 14"L x 10"W x 6"H
Roll Around: 34"H

HC-130S-PS

HC-130S-PS
Three Zone, Three Hydraulic Circuits with PS Option

This unit is most often used as a dedicated always connected power unit for supplying hydraulic-only clamps. Two zones each supply hydraulics to half of the Ram Clamps for cross connected capability, with the third zone powering the Bolster Clamps. The PS option ties into the press control for press shut down on loss of system pressure. Available in B (HC-130B-PS) and P (HC-130P-PS) mounting configurations.

Weight60 lbs.
Pedestal/Base adds 40 lbs.
Bracket adds 10 lbs.
Reservoir Capacity2 1/2 qts.
DimensionsCabinet Only: 21"L x 10"W x 16"H
Pedestal/Base: 29"H
Bracket: 14"L x 10"W x 6"H

HC-140S-PS-DL

HC-140S-PS-DL
Four Zone, Four Hydraulic Circuits with PS and DL Options

This unit is used in dedicated always connected applications and operates three zones for clamps exactly like the 130S-PS above, but adds a fourth zone to operate the Die Lifters. Available in B (HC-140B-PS-DL) and P (HC-140P-PS-DL) mounting configurations.

Weight65 lbs.
Pedestal/Base adds 40 lbs.
Bracket adds 10 lbs.
Reservoir Capacity2 1/2 qts.
DimensionsCabinet Only: 21"L x 10"W x 16"H
Pedestal/Base: 29"H
Bracket: 14"L x 10"W x 6"H

Electronic Valve Power Units

Electronic-Valve--Power-Units
Electronic valve versions of our historically popular Mechanical Valve Power Units, provide for a new approach to QDC control. Removing the control interface and shifting that to a remote location allows customers to create or use any control method they choose to operate, lock out, and/or key control the system, and provides the freedom to locate the box itself in a hidden or out of the way location.

Valves to the clamps are normally open which results in constant system pressure to the clamps regardless of power availability. DL circuits have normally closed valves which must be activated to provide pressure to the Die Lifters.

HC-173S-PS
Three Zone Electronic Valves, Three Hydraulic Circuits

This unit is used as a dedicated always connected power unit for supplying hydraulic-only clamps. Two zones each supply hydraulics to half of the Ram Clamps for cross connected capability with the third zone powering the Bolster Clamps. The PS option ties into the press control for press shut down on loss of system pressure. Available in B (HC-173B-PS) and P (HC-173P-PS) mounting configurations.

Weight60 lbs.
Pedestal/Base adds 40 lbs.
Bracket adds 10 lbs.
Reservoir Capacity4 1/2 qts.
DimensionsCabinet Only: 21"L x 10"W x 16"H
Pedestal/Base: 29"H
Bracket: 14"L x 10"W x 6"H
HC-174-PS-DL
Four Zone Electronic Valves Four Hydraulic Circuits

This unit is used in dedicated always connected applications and operates three zones for clamps exactly like the HC-173S-PS above, but adds a fourth zone to operate the Die Lifters. Available in B (HC-174B-PS-DL) and P (HC-174P-PS-DL) mounting configurations.

Weight65 lbs.
Pedestal/Base adds 40 lbs.
Bracket adds 10 lbs.
Reservoir Capacity4 1/2 qts.
DimensionsCabinet Only: 21"L x 10"W x 16"H
Pedestal/Base: 29"H
Bracket: 14"L x 10"W x 6"H
View/Download Hydraulic Control Units (Hydraulic Pump/Valves for Clamps and Lifters) User Guides:

Pneumatic (Air Bag) Die Lifters

PFA Quick Die Change Model 948 and 950 Pneumatic Air Die Lifter Rail Schematic Drawing
Standard Rail Configurations
Model No.SlotRectangular
or T-Slot
Max Load per foot
(lbs./ft./pr.)
LengthMax Load Capacity
(lbs./pr.)
Rollers/ Pistons
(per rail)
Cylindrical Rollers948N3/4” (.800)
Narrow
T-Slot1,80012”
18”
24”
30”
36”
42”
48”
54”
60”
66”
72”
1,800
2,700
3,600
4,500
5,400
6,300
7,200
8,100
9,000
9,900
10,800
4
6
8
10
12
14
16
18
20
22
24
Cylindrical Rollers
948W1” (.995)
Wide
T-Slot2,60012”
18”
24”
30”
36”
42”
48”
54”
60”
66”
72”
2,600
3,900
5,400
6,500
7,800
9,100
10,400
11,700
13,000
14,300
15,600
4
6
8
10
12
14
16
18
20
22
24
Cylindrical Rollers
Ball Rollers950N3/4” (.800)
Narrow
T-Slot1,80012”
18”
24”
30”
36”
42”
48”
54”
60”
66”
72”
1,800
2,700
3,600
4,500
5,400
6,300
7,200
8,100
9,000
9,900
10,800
11
17
23
29
35
41
47
53
59
65
71
Ball Rollers
950W1” (.995)
Wide
T-Slot2,60012”
18”
24”
30”
36”
42”
48”
54”
60”
66”
72”
2,600
3,900
5,400
6,500
7,800
9,100
10,400
11,700
13,000
14,300
15,600
11
17
23
29
35
41
47
53
59
65
71
Ball Rollers

How to determine available Die Lifter Rail Options

1. List out die sizes and weights.  Calculate die load per foot, per pair of lift rails.  (W=width in feet)

Die 1 Weight ________ ÷ W = ________ lbs./ft./pair
Die 2 Weight ________ ÷ W = ________ lbs./ft./pair
Die 3 Weight ________ ÷ W = ________ lbs./ft./pair

Determine heaviest die per foot. Heaviest die density lb./ft./pair = __________________

channel-throat-diagram2. Measure T-Slot or Rectangular channel throat.
If A = .800 to 1.000, use Narrow Rails
If A = 1.000 to 1.25, use Wide Rails
If A = <.800 or >1.25, contact PFA

3. For the heaviest die, check the number of available slots under the die:  Number of available slots = _______________

4. Take the die density from Part 1 and find the closest larger lbs./ft./pair from the chart below.  Then move across the top to find your desired die lifter style keeping in mind the Narrow or Wide from Part 2 and the number of available slots from Part 3.  (*Assume 85psi air available)

Die
Density
(lbs./ft./pair)
Narrow Slot
948N
(1,800 lbs./ft./pr.)
Wide Slot
948W
(2,600 lbs./ft./pr.)
1,8002 Rails2 Rails
2,6003 Rails2 Rails
3,6004 Rails3 Rails
3,9005 Rails3 Rails
4,5005 Rails4 Rails

For larger die weights or fewer available slots mechanical or hydraulic die lifters are recommended.

5. Record the rail model number and number of needed rails from the chart: Model ___________________    Quantity _________

6. For the selected model, confirm that the number of rails always supports the dies as follows:

[W ft.] x [Chart lbs./ft./pair] x [No. of Rails] / 2 = [Lift Capacity] > [Weight lbs.]

Die 1 ______ x ______ x ______ ÷ 2 = ______  >  ______
Die 2 ______ x ______ x ______ ÷ 2 = ______  >  ______

Ensure lift capacity is greater than die weight.

7. With model number and quantity determined, select the rail length desired.   Lifter will be flush with the loading side and should be near the back side but not longer than the bolster slot. Nominal lengths are 12”, 18”, 24”, 30”, 36”, 42”, 48”, 54”, 60”, 66”, 72”, +++    Length = ___________________

If slot is longer than nominal, add filler bar length to end of part number.    Filler = ___________________

8. Finally, the profile and final shape of the rail must be calculated below.

How to Size a “T” Slot:

t-slot-diagram1. Measure Neck Height (D), Full Width Depth (ET) and B:
D = ___________
ET = ___________
B = ___________
C = ET – D = ___________

2. Determine Nominal Lift (N)
Typically N = .085” or .125” (1/8” max)
Choose N = ___________________

3. Calculate Tab Height (T)
T = C – N – .250” = ___________________ (.xxx)

4. Calculate Rail Height (H)
H = ET – .250 = ___________________ (H.HHH)

For Narrow Rail (.800 < A < 1.00) confirm slot fit
B ≥ 1.300” C ≥ .500” ET ≥ 1.250”

For Wide Rail (1.00 < A < 1.25) confirm slot fit
B ≥ 1.700” C ≥ .575” ET ≥ 1.300”

Air or Pneumatic Die Lifter Rail for QDC Quick Die Change SMED part number specification

Mechanical 1/4 Turn Quick Set Clamps

Standard Configurations

Model 255 clamps are designed for 3/4” T-Slots and Model 259 for 1” T-Slots. The part number references the “bolt length”, which is not the clamping height, but rather the complete length of the bolt. The charts show nominal clamping height for standard T-Slots. The bolt length can be selected for the part number below.

Model 255
TSB Nominal Clamp Height**
Clamp Range B*
(Standard 3/4” Slot)
Min.     Max.
A+B*
Min.     Max.
CDE
0 – 10”1.125”.75”2.0”2.0”2.5”4.0”
1 – 2.875”2.125”1.75”3.0”2.5”5.0”
2 – 31.875”3.125”2.75”4.0”2.5”6.0”
2½ – 42.375”4.125”3.25”5.0”3.0”7.0”
3 – 52.875”5.125”3.75”6.0”3.5”8.0”
3½ – 63.375”6.125”4.25”7.0”4.0”9.0”
Model 259
TSB Nominal Clamp Height**
Clamp Range B*
(Standard 1” Slot)
Min.     Max.
A+B*
Min.     Max.
CDE
0 – ½0”.6”.75”1.6”2.4”2.5”4.0”
¾ – 1½.75”1.6”1.75”2.6”2.5”5.0”
1¾ – 2½1.75”2.6”2.75”3.6”2.5”6.0”
2¼ – 3½2.25”3.6”3.25”4.6”3.0”7.0”
2¾ – 4½2.75”4.6”3.75”5.6”3.5”8.0”
3¼ – 5½3.25”5.6”4.25”6.6”4.0”9.0”

* T-Slot neck height (dimension A) is assumed to be .875” for 3/4” slots and 1” for 1” slot.

** TSL Style with retaining ring incure a 1/4” reduction in maximum clamp height.

Suffix – STN may replace – TSB if fully threaded stock and T-Nut is cleared for no minimum clamping heights.  Maximum clamping height for STN is calculated as follows:
Model 255 BMAX = E – 3.25
Model 259 BMAX = E – 4.00

Quick Die Change QDC Quick Set turn Clamp Lightning fast Time Saver when installing dies
Quick Die Change QDC Quick Set turn Clamp Lightning fast Time Saver when installing dies - part number specification

Stationary Spring Loaded Die Lifter Rails

How to Determine Available Die Lifter Rail Options

1. List out die sizes and weights.  Calculate die load per foot, per pair of lift rails.  (W=width in feet)
Die 1 Weight ________ ÷ W = ________ lbs./ft./pair
Die 2 Weight ________ ÷ W = ________ lbs./ft./pair
Die 3 Weight ________ ÷ W = ________ lbs./ft./pair

Determine heaviest die per foot. Heaviest die density lb./ft./pair = __________________

2. Measure T-Slot or Rectangular channel throat.
If A = .800 to 1.000, use Narrow Rails
If A = 1.000 to 1.25, use Wide Rails
If A = <.800 or >1.25, contact PFA

3. For the heaviest die, check the number of available slots under the die:  Number of available slots = _______________

4. Take the die density from Part 1 and find the closest larger lbs./ft./pair in the chart to the right.  Then move across the chart to find the minimum number of slots, keeping in mind the Narrow or Wide from Part 2 and the number of available slots from Part 3.  If your application does not support the number of slots needed, see page 11 (Hydraulic Die Lifters/Rollers) or call PFA for assistance.

5. Record the rail model number and number of needed rail slots from the chart: Model ___________________    No. of Slots _________

6. For the selected model, confirm that the number of rails always supports the dies as follows:  [W ft] x [Chart lbs./ft./pair] x [No. of Rails] / 2 = [Lift Capacity] > [Weight lbs.]

Die 1 ______ x ______ x ______ ÷ 2 = ______  >  ______
Die 2 ______ x ______ x ______ ÷ 2 = ______  >  ______

Ensure lift capacity is greater than die weight.

8. Use the Model Number and Bolster Length (V) to determine the slot length to fill.  Lifters should start at the loading side of the bolster and end near the other side for maximum versatility.

9. Use slot dimensions to determine rail part numbers.  Use of multiple 7”, 10” or 12” rail sections versus one long rail is recommended to take advantage of stock parts and flexible installations.

Quick Die Change QDC Spring Loaded Die Lifter Rail - ball roller specification
Quick Die Change QDC Spring Loaded Die Lifter Ball roller Rail
Bolster Dimensions QDC Quick Die Change for How to Size a die lifter rail
Quick Die Change QDC T-Slot Diagram PFA How to size a lifter and die rail in T slot
Die Density
(lbs./ft./pair)
Narrow SlotWide Slot
357N
(1,800 lbs./ft./pr.)
357W
(2,000 lbs./ft./pr.)
1,8002 Rail Slots2 Rail Slots
2,0003 Rail Slots2 Rail Slots
2,7003 Rail Slots3 Rail Slots
3,0004 Rail Slots3 Rail Slots
3,6004 Rail Slots4 Rail Slots
4,0005 Rail Slots4 Rail Slots

 

Length
(in)
357N Max
Load Capacity
(each section)
357W Max
Load Capacity
(each section)
Ball Rollers
(each section)
7600 lbs.690 lbs.6
10800 lbs.920 lbs.8
12900 lbs.1035 lbs.9

Other sizes available. Please contact PFA for details.

Spring Loaded Ball Cartridges

Quick Die Change QDC Spring Loaded Ball roller Die Lifter Installation diagram
Part No.Allowable Load
lbs. per Cartridge
Ball DiameterabHole A
+.005   -000
Hole B
+.005   -000
Hole C
+.005   -000
MR-305-1245 lbs.¾1⅛.750”1.130”1.110”
MR-305-1345 lbs.13/161⅛.813”1.130”1.110”
MR-305-1570 lbs.15/3215/161⅛.937”1.130”1.110”
MR-305-1670 lbs.15/3211⅛1.000”1.130”1.110”
MR-305-19115 lbs.1-3/161⅜1.187”1.375”1.355”
MR-305-21115 lbs.1-5/161⅜1.312”1.375”1.355”
MR-305-25150 lbs.1-9/161.562”1.770”1.750”
MR-305-26200 lbs.1⅝1.625”1.770”1.750”

1 – Use hole information for mode exact dimensions and proper bolster modifications.

2 – Please note difference in hole depth.  Drill point allows cartridge to sit deeper due to chamfer on bottom of cartridge housing.

Damaged cartridges can readily be extracted and replaced.  Thread a 4-40 UNC screw into the thread hole and pull cartridge out.

Model 305 allows movement of dies in any direction.  A push of about 2-4% of die weight is usually required to move a die.

Install a pattern of Model 305 on a press bolster.  Keep die weight and footprint in mind to ensure that a die can be adequately supported.  When a die is clamped, the die lifter cartridges under the die will compress.

Quick Die Change QDC Spring Loaded Die Lifter - Image of sizes

Hand Operated and Portable, Mechanical Die Lifters and Lifter Systems

Model 710.  The popular and portable Mechanical Die Lifter Rail is typically installed in a slot in the bolster with rollers up.  The lifters are mechanically actuated by hand to the lifted position prior to die insertion and then released to lower the die.  (Note: The amount of force required to elevate the die varies with handle position and is in the range of 1.5% to 2.5% of die weight.  2,000 lb. die = 30-50 lbs.) To allow portable lifters to be taken from press to press, slots are shimmed to a common slot depth among presses.  Model 710 lifters are used with standard Bolster Extensions.

The lifter is inserted, handle up, under the die.  When the handle is moved to the horizontal position the die lifter expands .085” to lift the die approximately .060” above the bolster surface.  Available in .80” Narrow (N) 3/4” slot and 1.03” Wide (W) 1” slot versions, these portable units can be used in multiple presses, greatly reducing QDC equipment costs.

Model 706.  A mechanically actuated die lifter which is used, rollers down, to move dies from “slotted” Bolster Extensions or a die transfer table onto the bolster and vice-versa. With rollers down, this acts to add wheels to the die.  (See page 30 for the combined Model 706 lifter and Bolster Extension options).

Model No.Standard LengthsMax  Load Capacity per pair
710N (3/4” slot)24”/30”/36”/42”/48”8,000 lbs.
710W (1” slot)
706N (3/4” slot)24”/30”/36”/42”/48”8,000 lbs.
706W (1” slot)
Quick Die Change QDC  Mechanical Die Lifter Portable part number specifications
Quick Die Change QDC  Mechanical Die Lifter Inline Roller Rail Portable 706 an 710
Quick Die Change QDC  Mechanical Die Lifter Portable model 710 in slots
Quick Die Change QDC  Mechanical Die Lifter Portable - slot requirements
Quick Die Change QDC  Mechanical Die Lifter Portable model 710 rollers up
Quick Die Change QDC  Mechanical Die Lifter Portable model 706 rollers down

Lift-Off Bolster Extensions

Model No.TypeStyleABCDEApproximate Weight
520Lift-OffStandard
6,000 lbs./pair
14”/16”6”910 Bkt
2.50”
6088 Bkt
2.62”
910 Bkt
4.20”
6088 Bkt
6.80”
910 Bkt
4.25”
6088 Bkt
3.62”
15/20 lbs.
20”/24”/28”/32”8”25/35/40/45 lbs.
36”/40”10”910 Bkt ONLY 2.50”910 Bkt ONLY 4.20”910 Bkt ONLY 4.25”60/65 lbs.
540Lift-OffHeavy-Duty
8,000 lbs./pair
14”/16”6”918 Bkt
3.00”
918 Bkt
7.82”
918 Bkt
5.00”
15/20 lbs.
20”/24”/28”/32”8”25/35/40/45 lbs.
36”/40”10”60/65 lbs.

Please order at least one mounting bracket for each extension arm. Bolster extensions are ordered as each.
To order a pair, order 2 extensions.

Lift-off Bolster Extensions provide for easy removal during press operations and allow a single pair to be used on multiple presses.  For maximum utility, install mounting brackets on several presses and use a single pair of Bolster Extensions.  Available in a variety of models for a variety of applications.

Model 520 is a “standard duty” lift-off Bolster Extension with rollers, which allows convenient loading and unloading of dies to/from press bolsters. Die weight capacity per pair is 6,000 pounds.  Model 540 is the “heavy duty” version at 8,000 lbs./pair.

Load/unload dies using forklift, die cart or crane. The force required to roll dies on/off the Bolster Extensions is in the range of 1% to 3% of the die weight.

Lift-Off Bolster Extensions are produced in several other models:  522, 522B and 530 for use with Model 706 Mechanical Die Lifters and  bolsters without slots for die lifters.  (See page 30).

Bracket Height (E Dimension) is the height of the bracket itself – not the distance from the bolster surface.  For a typical nominal 0.090” roller height above the bolster surface, the bottom of the mounting bracket would be located at the following distances from the bolster surface:  Model 910 Bracket = 4.6”, Model 6088 Bracket = 4.0”, Model 918 Bracket = 5.2”.  For complete mounting details contact PFA.

Quick Die Change QDC  Bolster Extension Lift Off part number specification
Quick Die Change QDC  Bolster Extension Lift Off Model 520 and 540
Quick Die Change QDC  SMED Bolster Extension Lift Off Mounting

Swing-Away Bolster Extensions

Designed as a permanent solution, Swing-Away Bolster Extensions are always available, yet easily moved out of the way, as needed.  Extensions are rated for 6,000 lbs per pair and available up to 40 inches in length, fitting comfortably into most die applications where swing-away extensions are practical.

In applications where extension arms will be stored outward or where the extension separation on the press is greater than 2x the length, arms of the same size work nicely.  For inward storage where arms need to overlap, ordering the next smaller size extension for one side along with a nesting spacer is recommended*. This makes the hinge location different between the two arms and allows one extension to store closer to the bolster than the other arm (See illustration).

Model No.Recommended Spacer Assembly*AB
527-16
527-18
527-20
2” Thick
P/N: 6580
16.41”
18.41”
20.41”
7.20”
527-24
527-28
527-32
4” Thick
P/N: 14688
24.41”
28.41”
32.41”
9.15”
527-36
527-40
4” Thick
P/N: 14689
36.05”
40.21”
11.90”

*When using different model (length) arms in a nesting application, use only arms with matching “B” dimensions.

For spacer assemblies use style and model number only. Example:  BE-14688

Quick Die Change QDC  Bolster Extension Swing Away part number specification
Quick Die Change QDC  SMED Bolster Extension Swing Away model 527
Quick Die Change QDC  SMED Bolster Extension Swing Away model 527

For non-nesting application, order same size extensions.
Example – for 28” application:
• Qty. 2   BE-527-28

For nesting application, order one extension shorter with a spacer assembly.  Example – for a 28” application:
• Qty. 1   BE-527-28 extension
• Qty. 1   BE-527-24 extension
• Qty. 1   BE-14688 spacer assembly

Detachable Bolster Extensions

Designed for larger load applications, Models 524 and 524HD Detachable Bolster Extensions provide maximum flexibility for press access and easy movement to other presses.  A gate latch and lock pin easily secure the bolster extensions to Model 914 mounting brackets for semi-permanent integrity during die loading and unloading operations.  Steel wheels allow for strong rigid support of the extensions during use and comfortable rolling to another press, if used as part of a modular multi-press QDC system.

The Detachable Bolster Extensions are custom made to match the application height requirements with a +/-
2 inch height adjustment for leveling and some flexibility for variations in press heights.  Extension height from the floor to the top of the rollers is specified by a height dimension in the part number.

While the 524 series is designed to be ordered and provided as a standardized production part, customizations of the 524 are available for a variety of unique requirements up to 60,000 lbs./pair.  Please contact PFA with application details.

Bracket Height is for the bracket only and not the distance from the die lifter roller surface or bolster surface.  For a nominal .090” roller height above the surface, the bottom of the mounting bracket will be 6.0” below the surface.  Minimum bolster thickness is 5”.   For complete mounting details contact PFA.

Quick Die Change QDC  SMED Bolster Extension Removable part number specification
Quick Die Change QDC SMED Bolster Extension Removable with Leg 524 and 524HD
Model – Length
Model No.
ADie Weight
524-36
524-42
524-48
524-60
524-72
524-84
**
36.00”
42.00”
48.00”
60.00”
72.00”
84.00”
**
16,000 lbs./pair
524HD-36
524HD-42
524HD-48
524HD-60
524HD-72
524HD-84
**
36.00”
42.00”
48.00”
60.00”
72.00”
84.00”
**
35,000 lbs./pair

**Other sizes available. Call PFA for details.

Quick Die Change QDC  SMED Bolster Extension Removable with Leg 524 and 524HD
View/Download Detachable Heavy Duty Bolster Extensions with Legs User Guides:

Traveling & Slotless Bolster Extensions

Traveling Bolster Extensions

Models 522 and 522B

Quick Die Change QDC  SMED Bolster Extension Traveling model 522  for use with mechanical lifters
Model No.ABWeight
52214”6.00”15 lbs.
16”6.00”20 lbs.
20”8.00”25 lbs.
24”8.00”35 lbs.
28”8.00”40 lbs.
32”8.00”45 lbs.
36”10.00”60 lbs.
40”10.00”65 lbs.
53014”6.00”15 lbs.
16”6.00”20 lbs.
20”8.00”25 lbs.
24”8.00”35 lbs.
28”8.00”40 lbs.
32”8.00”45 lbs.
36”10.00”60 lbs.
40”10.00”65 lbs.
PFA traveling bolster extension for Quick DIe Change SMED model 530

*For Bridge in T-Slot applications, add a “B” to the Model Number. Contact PFA for application assistance.

Slottless Bolster Extensions

Model 530 for Bolsters without slots for Die Lifters

Quick Die Change QDC  SMED Bolster Extension Traveling Slotless for Press without T slots to use
Quick Die Change QDC  SMED Bolster Extension Traveling and Slotless - Mounting
Please select the appropriate USER GUIDE for installation, use, and repair recommendations.

NOTE: All products are assumed to be operated by PFA hydraulic sources at standard pressures of 5,000 psi hydraulic. For other pressures and pressure sources, contact PFA for further recommendations. Selection of any product for any application is the responsibility of the customer PFA assistance and recommendations are not a substitute for proper review and selection by customer. PFA Terms of Sale apply. Dimensions are provided for reference only and subject to change without notice. Contact PFA regarding critical dimensions for any application prior to ordering.

 

Hydraulic Cylinder Style Clamps (Nut Clamps):
Hydraulic Fixed Clamp Height Rocker Clamps (Ledge Clamps)
Hydraulic Adjustable Clamp Height Rocker Clamps (Narrow Ledge Like Clamps)
Hydraulic Fixed Clamp Height Sliding Clamps (C Clamps)
  • CC-283
  • CC-283D
Hydraulic Die Lifters/Rollers
  • DR-315/316 (Single Inline Cam Roller)
  • DR-317/318 (Inline Ball Roller)
  • DR-322W (Cross Double Cam Roller)
  • DR-327/328 (Inline Double Cam Roller)
Hydraulic Control Units (Hydraulic Pump/Valves for Clamps and Lifters)
Pneumatic Die Lifters (Air Bag Lifters)
  • PR-948
Mechanical ¼ Turn Set Clamps (Quick Set Clamps)
  • MC-255
  • MC-259
Mechanical Portable Hand operated Die Lifters
  • MR-706 (Rollers Down)
  • MR-710 (Rollers Up)
Mechanical (Stationary) Spring loaded Die Lifters/Rollers
  • MR-357
Mechanical Spring Loaded Ball Cartridges
  • MR-305
Swing Away Bolster Extensions
  • BE-527
Lift Off Bolster Extensions
  • BE-520
  • BE-540
Detachable Heavy Duty Bolster Extensions with Legs
Traveling and Slotless Bolster Extensions.
  • BE-522

Reserved for future use.

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With a proven, production manufactured, customizable, and off-the-shelf solution from PFA, your applications work every time. Using a KOR-LOK® Side-Action System results in shorter design and manufacturing time, leading to shorter concept-to-production schedules. Quick Die Change (QDC) clamps are in stock and ready to ship, so you can start saving time and money today. From spare parts to complex solutions (which may take a few days to produce please), PFA is the answer to faster production and lower costs.