Fluid-advanced Work Supports have a plunger that is normally retracted for clear loading. Applying fluid pressure gently advances the plunger to the work piece then automatically locks it securely.
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These Work Supports have a long stroke to provide a large adjustment range.
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7500 psi max
Single Acting
FEATURES: Work Supports automatically adjust to the proper height for supporting a work piece, then lock securely to become fixed rests. Support plunger is held by a precision sliding-fit pressure sleeve that provides incredible accuracy and repeatability. Fluid-advanced Work Supports provide extra loading clearance and are ideal for work pieces that are too light to depress a spring-loaded plunger. The flange-base version shown here has a high load capacity and provides many mounting options.
SIZES: Available in one size, with USA or metric plunger threads — see Dimensions page for part number. Load capacity at 7500 psi:
SUPPORT ACTION (FLUID ADVANCED): Plunger is normally retracted for clear work piece loading and unloading. Applying fluid pressure gently advances the plunger to the work piece, where it contacts with light spring force. As fluid pressure increases, the precision sleeve grips the plunger, locking it securely. The plunger retracts again when pressure is released.
ACCURACY: Height repeatability within +/-.0002". Such excellent repeatability is possible because of two design features: 1) the sliding-fit pressure sleeve holds the plunger absolutely vertical even while unlocked, avoiding any inaccuracy due to locking a tilted plunger, and 2) locking force is entirely radial, so the plunger remains absolutely stationary during the locking process. Elastic deflection of the plunger is only .00003" per 100 lbs machining load.
DESIGN CONSIDERATIONS: If the work piece is light enough that plunger contact could lift it, use a Sequence Valve to delay advancing the work support until after the work piece is clamped. Do not exceed maximum fluid flow rate in table; otherwise the support could lock prematurely before the plunger is fully extended. Do not use the plunger to lift loads. The support plunger must always be protected against penetration of contaminants by the plastic plug furnished, or a contact bolt (order separately) When supporting underneath a clamp, use a Sequence Valve to delay clamping until the Work Support has reached sufficient load capacity to resist the clamping force. Support load capacity should be at least 2 times clamping force at all times, to resist not only static clamping force, but also dynamic forces due to clamping-arm momentum and machining forces.
MOUNTING: The flange base has two through holes and two tapped holes for mounting. Several possible mounting methods: 1) fasten to top of fixture plate with two socket-head cap screws, either inserted through the flange base from above, or threaded into the flange base from below; 2) Mount through a bored hole in the fixture plate, fastening with two socket-head cap screws, either inserted through the flange base from below, or threaded into the flange base from above; 3) Mount through a tapped hole in the fixture plate, securing with a lock ring; 4) Mount through a bored hole in the fixture plate, securing with one or two lock rings.
FLUID CONNECTION: 1/4" BSPP port. Do not use NPT fittings.
CONSTRUCTION: Plunger > Steel, case hardened. Body > Steel, black oxide finish. |
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