Features

Standard features of Wardcraft’s medium-duty bolster extensions include:

• 2,500-lb extension arm capacity
• 4,000-lb roller capacity
• Various standard lengths
  • 18”
  • 24”
  • 30”
  • 36”
• Three styles—lift-off, fold-over and swivel

Wardcraft Extension Arms Literature

• J-228 Medium Duty Lift Off Bolster Extensions
• J-235 Medium Duty Swivel Bolster Extensions

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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.

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When the original die is removed and a new die is positioned on the TEE-LIFT® system, the air is released, bringing the rollers and rails below the bolster surface and leaving the die securely in place. The weight of a die will determine whether the die can be positioned manually or mechanical assistance is required for loading/unloading

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• 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.

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• The Electro-permanent system does not lose holding force with loss of power.
  
• A spring safety key switch must be turned to the enable mode at the same time the mag or de-mag button is pushed eliminating the possibility to mag or de-mag inadvertently.
  
• A bottom dead center interlock prevents de-mag unless press is closed.
  
• Proximity switch puts the press into e-stop if a die separates from the magnet and ensures the die is flat enough with no air gaps to be properly held.
  
• CSS system checks the internal wiring in the magnet and controller to ensure correct system magnetization is achieved.
  
• MSD system checks the magnetic field to ensure the die is magnetic and no mechanical damage to the system has occurred during a die change and double checks the aire gap check of the proximity switch.

EASY TO INSTALL

• MBS is easy to install: using bolts to mount magnetic plates to existing T-slots or tapped holes.
• Its modularity allows adaptability for any need.
  
• No modifications to the press are required. MBS is made to fit your press.
  
• The new reduced thickness of the modules allows you to save press daylight. Bigger dies can be used in smaller presses.

FAST AND EASY

• One operator, with no tools, can operate all the die-clamping easily and in total safety, while staying outside the press.
  
• Load the die, close the press and press the button for the upper, then the lower.

SAFE AND UNIFORM

The MBS technology is not affected by electrical breakdowns; the die will stay in position even without power supply, with the same strength indefinitely. This uniform clamping force allows repeatability and constant quality of the stamping process by eliminating any flexing of the die shoe.

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