Hydraulic Clamping Fundamentals


for use in environments were it is exposed to minute contaminates such as cast iron grit, or aluminum fines. The escaping air will assist in precluding the ingress of foreign material between the plunger and compression sleeve. The plunger will not retract as long as the air pressure is maintained, which could move the work-piece out of position when the hydraulic pressure is removed. An internal return spring will retract the plunger for clearance to load and unload the work-piece after the hydraulic locking pressure and the extend air pressure have been removed. The plunger is locked in place by applying hydraulic pressure to the internal compression sleeve through a separate hydraulic port, after the plunger has contacted the work-piece.

Work supports are supplementary support devices to be used in conjunction with rigid support and / or locating points in a fixture. They also supports reduce the effects of vibration and deflection, helping to maintain work-piece accuracy during machining operations. The work support also helps compensate automatically for minor part variations during loading and imposed deflections during clamping and machining operations. Work supports use a hydraulically compressed sleeve to lock the plunger in place once it has engaged the work-piece. On the Fluid Advance and Spring Advance work supports, the spring force on the plunger determines the contact force on the work-piece. In the case of the air advanced work support, adjusting the air inlet pressure on the plunger determines the contact force exerted against the work piece. TYPE AND FUNCTION (See catalog for specific work support dimensional, locating, and mounting data.) Air Advance Work Support This type of work support uses air pressure to advance the plunger to contact the work-piece. This allows the contact force of the plunger to be adjusted by means of an air regulator. By leaving the air pressure applied at all times, the plunger will function as if it were lifted by an air spring. As there is no internal seal to prevent the air from escaping the unit, you may observe air escaping from around the plunger. Because of this, air advance work supports are well suited

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