Quick Die Change

Please scroll down for an OVERVIEW of the following Products:
  • 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)
  • Hydraulic Die Lifters/Rollers
  • Hydraulic Control Units (Hydraulic Pump/Valves for Clamps and Lifters)
  • Pneumatic Die Lifters (Air Bag Lifters)
  • Mechanical ¼ Turn Set Clamps (Quick Set Clamps)
  • Mechanical Portable Hand operated Die Lifters
  • Mechanical (Stationary) Spring loaded Die Lifters/Rollers
  • Mechanical Spring Loaded Ball Cartridges
  • Swing Away Bolster Extensions
  • Lift Off Bolster Extensions
  • Detachable Heavy Duty Bolster Extensions with Legs
  • Traveling and Slotless Bolster Extensions

Hydraulic Clamping and Lifting

Hydraulic Nut Clamps

nut-clamps-pg4-graphic

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

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.

MODEL CONFIGURATION OPTIONS
HM Hydra-Mechanical Clamps
DL Die Lifter Dedicated Zone with Overpressure Relief
PS Pressure Switch
S Stationary
C Carriable
R Roll-Around
P Pedestal
B Bracket
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.

Weight 25 lbs.
Reservoir Capacity 2 1/2 qts.
Dimensions 14"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.

Weight 30 lbs.
Reservoir Capacity 2 1/2 qts.
Dimensions 14"L x 9"W x 11"H

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.

Weight 55 lbs.
Pedestal/Base adds 40 lbs.
Bracket adds 10 lbs.
Roll Around adds 50 lbs.
Reservoir Capacity 4 1/2 qts.
Dimensions Cabinet 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).

Weight 110 lbs.
Cabinet: 60 lbs.
Pedestal/Base adds 40 lbs.
Bracket adds 10 lbs.
Roll Around adds 50 lbs.
Reservoir Capacity 2 1/2 qts.
Dimensions Cabinet 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.

Weight 60 lbs.
Pedestal/Base adds 40 lbs.
Bracket adds 10 lbs.
Reservoir Capacity 2 1/2 qts.
Dimensions Cabinet 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.

Weight 65 lbs.
Pedestal/Base adds 40 lbs.
Bracket adds 10 lbs.
Reservoir Capacity 2 1/2 qts.
Dimensions Cabinet 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.

Weight 60 lbs.
Pedestal/Base adds 40 lbs.
Bracket adds 10 lbs.
Reservoir Capacity 4 1/2 qts.
Dimensions Cabinet 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.

Weight 65 lbs.
Pedestal/Base adds 40 lbs.
Bracket adds 10 lbs.
Reservoir Capacity 4 1/2 qts.
Dimensions Cabinet Only: 21"L x 10"W x 16"H
Pedestal/Base: 29"H
Bracket: 14"L x 10"W x 6"H

Air Lifting Systems

pneumatic-air-bag-die-lifters

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, 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.

Designed for standard ¾” and 1” T slots and available in an unlimited variety of lengths, 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 and mount the air system to the sides of the bolster.

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.

Please scroll down for APPLICATION and DIMENSIONAL DATA  for the following Products:
  • 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)
  • Hydraulic Die Lifters/Rollers
  • Hydraulic Control Units (Hydraulic Pump/Valves for Clamps and Lifters)
  • Pneumatic Die Lifters (Air Bag Lifters)
  • Mechanical ¼ Turn Set Clamps (Quick Set Clamps)
  • Mechanical Portable Hand operated Die Lifters
  • Mechanical (Stationary) Spring loaded Die Lifters/Rollers
  • Mechanical Spring Loaded Ball Cartridges
  • Swing Away Bolster Extensions
  • Lift Off Bolster Extensions
  • Detachable Heavy Duty Bolster Extensions with Legs
  • Traveling and Slotless Bolster Extensions

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 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-nut-clamps-standard-configurations
Model 200/200L Model 201/201L Model 205/205L
Bolster/Ram Interface T-Slot ¾” or 1” Threaded Hole (TH) T-Slot 1” only T-Slot ⅝”, ¾” or 1” Threaded Hole (TH)
Clamping Force at 5,000 PSI 10,000 lbs. 15,000 lbs. 8,000 lbs.
Clamping Stroke .29” .60” .25”
Standard Thread Size ¾” – 10 Hole Size*** ⅝” – 11×1.85 minimum 1” – 8 ⅝” – 11 Hole Size*** ½” – 13×1.85 minimum
A 2.50” 3.12” 2.00”
B Full 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”
**
Weight 3.0 lbs. 5.0 lbs. 8.5 lbs. 2.0 lbs. 3.0 lbs.
nut-clamp-chart-image-1 nut-clamp-chart-image-2 nut-clamp-chart-image-3 nut-clamp-chart-image-4 nut-clamp-chart-image-5 nut-clamp-chart-image-6 nut-clamp-chart-image-7 nut-clamp-chart-image-8 nut-clamp-chart-image-9 nut-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-nut-clamps-part-number

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-ledge-clamps-standard-configurations
Model 425 Model 425L Model 428 Model 428L Model 126 Model 126L Model 128 Model 128L
Clamping Force at 5,000 PSI 8,000 lbs. 10,000 lbs. 22,000 lbs. 26,000 lbs.
T-Nut Spacing N/A N/A 6” 6”
A 4.25” 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”
**
C Jaw Opening to Match CLH* + .18” gap Jaw Opening to Match CLH* + .18” gap Jaw Opening to Match CLH* + .18” gap Jaw Opening to Match CLH* + .18” gap
D 4.00” 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” Max 1.12” Max.
Weight (approx.) 8 lbs. 12 lbs. 25 lbs. 35 lbs.
ledge-clamp-chart-image-1 ledge-clamp-chart-image-2 ledge-clamp-chart-image-3 ledge-clamp-chart-image-4 ledge-clamp-chart-image-5 ledge-clamp-chart-image-6 ledge-clamp-chart-image-7 ledge-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-ledge-clamps-part-number

Hydraulic "Ledge Like" and Narrow Style Adjustable Rocker Clamps

Standard Configurations
QDC adjustable rocker clamp standard configurations
Model 661    /    Model 661L Model 825    /    Model 825L Model 835    /    Model 835L
Clamping Force at 5,000 PSI 3,500 lbs. 8,000 lbs. 17,000 lbs.
Stud Thread Size ⅝” – 11 ¾” – 10 1” – 8
T-Nut/Slot Style ¾” or 1” ¾” or 1” 1”
A 5.25” 7.5” 9.6”
B 1.75” 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-1 rocker-clamps-chart-image-2 rocker-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-clamp-part-number

Hydraulic, Fixed Clamp Height, Sliding Style C-Clamp

Standard Configurations
c-clamp-drawing
Model 283 Model 283D
Clamp Force at 5,000 PSI 6,700 lbs 6,900 lbs.

 

Clamp Height CLH Slot 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*
-50 1.560”
-75 1.810”
-100 2.060”
-125 2.310”
-150 2.560”
-175 2.810”
-200 3.060”
-225 3.310”
-250 3.560
**
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”

C Clamp Quick Die Change QDC

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.)
1,800 2 Rails 2 Rails
2,150 3 Rails 2 Rails 2 Rails 2 Rails
2,700 3 Rails 2 Rails 3 Rails 2 Rails
3,225 4 Rails 2 Rails 3 Rails 2 Rails
3,600 4 Rails 2 Rails 4 Rails 2 Rails
4,000 5 Rails 2 Rails 4 Rails 2 Rails
4,300 5 Rails 3 Rails 4 Rails 3 Rails 2 Rails
4,500 5 Rails 3 Rails 5 Rails 3 Rails 2 Rails
5,500 6 Rails 3 Rails 5 Rails 3 Rails 2 Rails
6,000 ** ** ** ** **

**For large die densities, call PFA.

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

Cylindrical Rollers

315N 3/4” (.800)
Narrow
Rectangular 1.495 (LP)
1.805 (HP)
9”
11”
14”
21”
24”
30”
33”
36”
40”
42”
45”
48”
54”
60”
66”
72”
84”
87”
90”
4,000 3,000
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
316N T-Slot
315W 1” (.995)
Wide
Rectangular
316W T-Slot
327W 1” (.995)
Wide
Rectangular 1.495 (LP)
1.805 (HP)
24”
30”
36”
42”
48”
54”
60”
66”
72”
78”
84”
96”
108”
120”
9,000 18,000
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
328W T-Slot
322W 1” (.995)
Wide
T-Slot 1.495 (LP)
1.805 (HP)
24”
30”
36”
42”
48”
54”
60”
66”
72”
4,000 8,000
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

317N 3/4” (.800)
Narrow
Rectangular 1.485 (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”
1,800 1,400
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
318N T-Slot
317W 1” (.995)
Wide
Rectangular 1.485 (LP)
1.720 (HP)
14”
19”
24”
29”
34”
39”
44”
48”
53”
58”
63”
68”
73”
78”
83”
88”
92”
2,150 2,500
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
318W T-Slot

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

qdc-how-to-size-a-rectangular-rail

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

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

** 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.

Pneumatic (Air Bag) Die Lifters

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.)
1,800 2 Rails 2 Rails
2,600 3 Rails 2 Rails
3,600 4 Rails 3 Rails
3,900 5 Rails 3 Rails
4,500 5 Rails 4 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”

pneumatic-die-lifter-part-number

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.
C D E
0 – 1 0” 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 – 3 1.875” 3.125” 2.75” 4.0” 2.5” 6.0”
2½ – 4 2.375” 4.125” 3.25” 5.0” 3.0” 7.0”
3 – 5 2.875” 5.125” 3.75” 6.0” 3.5” 8.0”
3½ – 6 3.375” 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.
C D E
0 – ½ 0” .6” .75” 1.6” 2.4” 2.5” 4.0”
¾ – 1½ .75” 1.6” 1.75” 2.6” 2.5” 5.0”
1¾ – 2½ 1.75” 2.6” 2.75” 3.6” 2.5” 6.0”
2¼ – 3½ 2.25” 3.6” 3.25” 4.6” 3.0” 7.0”
2¾ – 4½ 2.75” 4.6” 3.75” 5.6” 3.5” 8.0”
3¼ – 5½ 3.25” 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 Set Clamp Lightning Time Saver
Quick Die Change QDC Set Clamp Lightning Time Saver

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
Quick Die Change QDC Spring Loaded Die Lifter Rail
Bolster Dimensions QDC Quick Die Change
Slot Dimensions QDC Quick Die Change
Die Density
(lbs./ft./pair)
Narrow Slot Wide Slot
357N
(1,800 lbs./ft./pr.)
357W
(2,000 lbs./ft./pr.)
1,800 2 Rail Slots 2 Rail Slots
2,000 3 Rail Slots 2 Rail Slots
2,700 3 Rail Slots 3 Rail Slots
3,000 4 Rail Slots 3 Rail Slots
3,600 4 Rail Slots 4 Rail Slots
4,000 5 Rail Slots 4 Rail Slots

 

Length
(in)
357N Max
Load Capacity
(each section)
357W Max
Load Capacity
(each section)
Ball Rollers
(each section)
7 600 lbs. 690 lbs. 6
10 800 lbs. 920 lbs. 8
12 900 lbs. 1035 lbs. 9

Other sizes available. Please contact PFA for details.

Spring Loaded Ball Cartridges

Quick Die Change QDC Spring Loaded Die Lifter
Part No. Allowable Load
lbs. per Cartridge
Ball Diameter a b Hole A
+.005   -000
Hole B
+.005   -000
Hole C
+.005   -000
MR-305-12 45 lbs. ¾ 1⅛ .750” 1.130” 1.110”
MR-305-13 45 lbs. 13/16 1⅛ .813” 1.130” 1.110”
MR-305-15 70 lbs. 15/32 15/16 1⅛ .937” 1.130” 1.110”
MR-305-16 70 lbs. 15/32 1 1⅛ 1.000” 1.130” 1.110”
MR-305-19 115 lbs. 1-3/16 1⅜ 1.187” 1.375” 1.355”
MR-305-21 115 lbs. 1-5/16 1⅜ 1.312” 1.375” 1.355”
MR-305-25 150 lbs. 1-9/16 1.562” 1.770” 1.750”
MR-305-26 200 lbs. 1⅝ 1.625” 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

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 Lengths Max  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
Quick Die Change QDC  Mechanical Die Lifter Portable
Quick Die Change QDC  Mechanical Die Lifter Portable
Quick Die Change QDC  Mechanical Die Lifter Portable
Quick Die Change QDC  Mechanical Die Lifter Portable
Quick Die Change QDC  Mechanical Die Lifter Portable

Lift-Off Bolster Extensions

Model No. Type Style A B C D E Approximate Weight
520 Lift-Off Standard
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.
540 Lift-Off Heavy-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
Quick Die Change QDC  Bolster Extension Lift Off
Quick Die Change QDC  Bolster Extension Lift Off

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* A B
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
Quick Die Change QDC  Bolster Extension Swing Away
Quick Die Change QDC  Bolster Extension Swing Away

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  Bolster Extension Removable
Quick Die Change QDC  Bolster Extension Removable
Model – Length
Model No.
A Die 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  Bolster Extension Removable

Traveling & Slotless Bolster Extensions

Traveling Bolster Extensions

Models 522 and 522B

Quick Die Change QDC  Bolster Extension Traveling Slotless
Model No. A B Weight
522 14” 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.
530 14” 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.
traveling-bolster-part-number

*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  Bolster Extension Traveling Slotless
Quick Die Change QDC  Bolster Extension Traveling Slotless
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)
  • RC-425
  • RC-425L (Hydra-Mechanical, Locking)
  • RC-428
  • RC-428L (Hydra-Mechanical, Locking)
  • RC-126
  • RC-126L (Hydra-Mechanical, Locking)
  • RC-128
  • RC-128L (Hydra-Mechanical, Locking)
Hydraulic Adjustable Clamp Height Rocker Clamps (Narrow Ledge Like Clamps)
  • RC-661
  • RC-661L (Hydra-Mechanical, Locking)
  • RC-825
  • RC-825L (Hydra-Mechanical, Locking)
  • RC-835
  • RC-835L (Hydra-Mechanical, Locking)
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)
  • HC-105 ALL
  • HC-125 ALL
  • HC-120 ALL
  • HC-130 ALL
  • HC-140 ALL
  • HC-171,172,173, 174 ALL
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
  • BE-524
  • BE-524HD
Traveling and Slotless Bolster Extensions.
  • BE-522

Reserved for future use.