Spring Advance Work Support This type of work support uses an internal spring to advance the plunger to contact the work-piece. The spring keeps the plunger extended when the work support is not loaded. Spring advanced work supports are often used when the extended plunger will not interfere with the work-piece positioning during loading and unloading. As spring force is always present on the plunger the work-piece could move when hydraulic pressure is removed. The plunger is locked in place by applying hydraulic pressure to the internal compression sleeve thru a separate hydraulic port after the work-piece compresses the plunger.
prevents the compression sleeve from engaging before the spring lifts the hydraulic piston that extends the plunger. The use of a power supply with too high a flow rate may cause the compression sleeve to engage the plunger before it can be lifted into position. Excessive flow rates may also accelerate the plunger so fast that it bounces off the work-piece and the compression sleeve engages before it can recontact the piece-part. The unit uses a separate spring to return the piston, and plunger after the hydraulic pressure is removed. This type of support works well when the plunger must be retracted to clear the work-piece for loading and unloading. The plunger is locked in place by applying hydraulic pressure to the internal compression sleeve after the spring has lifted the plunger to contact the work-piece.
Fluid Advance Work Support This type of work support uses hydraulic pressure to advance an internal hydraulic piston that pushes against a spring, which in turn advances the plunger to contact the work-piece. This piston always travels full stroke regardless of the hydraulic pressure. An internal restriction
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