À Visser (Mini)
Piston Avancé Hydraulique
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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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Supporting underneath a clamp
(see design Considerations)
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Optional Mounting Base
(USA only)
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7500 psi max
Simple Effet
CARACTÉRISTIQUES: 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 mini threaded-body version shown here is amazingly compact. Manifold mounting capability allows space-saving low-height installation. Hardened contact bolt furnished.
TAILLES: Available in two sizes, with USA or metric threads, with each size also available in a long-stroke version — see Dimensions page for part numbers. Load capacity at 7500 psi:| | 1500 Lbs (USA & Metric) | | | 2200 Lbs (Metric only) |
MOUVEMENT D'APPUI: 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. When fluid pressure is applied, the precision sleeve grips the plunger, locking it securely. The plunger retracts again when pressure is released.
PRÉCISION: 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 .00016" per 100 lbs machining load.
CONSIDÉRATIONS DE CONCEPTION: 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 a contact bolt (furnished). 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.
MONTAGE: Several possible mounting methods: 1) install support directly into a flat-bottom tapped hole in the fixture – see drawings for hole-preparation instructions; 2) install support into a Mounting Base or Modular Work Support Adaptor, for vertical mounting; 3) install support into a Mounting Block, for horizontal mounting; 4) install support into a Feeder Cap and mount through a fixture wall (secure with a Jam Nut). In all cases, hydraulic sealing is accomplished by a Sealing Washer (furnished) placed directly underneath the support. Tighten to the recommended seating torque of 50 ft-lbs.
CONNEXION HYDRAULIQUE: For manifold mounting, fluid passages must be drilled as shown in the drawings. Do not use NPT fittings.
CONSTRUCTION: Plunger > Steel, case hardened. Body > Steel, black oxide finish. Sealing Washer > Delrin. |
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