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The PROHOLD® hydraulically actuated 6" vise provides advanced mechanical and ergonomic features not available in any other vise on the market today.  These vises are perfect for vertical machining centers.  A single vise or a stack using the common internal hydraulic manifold can be mounted on a VMC and powered by an external PROHOLD® hydraulic power unit as seen in the setup immediately below. 

Multiple 6" vises can be stacked side by side and operated individually and powered by the same single pump unit because of the common internal hydraulic manifold built into each vise body.  These vises can be completely automated to work in robotized machining cells for completely unmanned operations.

The 6" hydraulic vise has two moving jaws with full 2.5" bi-directional jaw stroke on each jaw, allowing for precise positive clamping inward toward a centrally mounted dead jaw, or outward on dead jaws mounted on each end of the vise.  Each moving jaw exerts approximately 4 tons of clamping force at 3800psi hydraulic pressure.  There is a manual open/close valve and pressure gauge mounted on the front of the vise for individual manual control.  For automated control the manual valve can be replaced by a solenoid valve or cross-over plate with a DO3 mounting pattern.  Each vise has four internal accumulators and an internal check valve.  The internal check valve allows individual vises in a stack of vises to be operated without affecting any other vises in the stack. 

The vise is made out of a one-piece, flame-hardened and ground 1045 steel body.  Quick change top jaws are available with hardened steel inserts or fully machinable soft jaws [aluminum or steel].  The hardened insert jaws are designed so that parts from 0" to 19" can be easily clamped by just rotating the top jaw 180º and/or moving the dead jaw(s) from the center to one end of the vise body through a series of different quick changeable configurations as seen immediately below.

The weight of the vise without jaws is approximately 88 lbs.  Overall dimensions are 6.25" wide, 3.125" high, 22.5" long.  There is a top cavity cover plate on each vise made out of A2 hardened steel.   This cover keeps swarf and chips out of the internal cavity of the vise body.   There is a drain on the bottom center of the back cover plate that allows for gravity drainage of fluids.  This port can be used to admit a positive air pressure to purge fluids and fine swarf from entering the cavity in application environments like those generating fine cast iron particulate. 

It's a real jungle out there these days when it comes to manual vises and vise towers.  PROHOLD's new PACHYDERM™ VISE TOWER will keep you from wasting time, monkeying around with all of those manual, time-consuming clusters that make life hard on the operator.  The PROHOLD® PACHYDERM™ TOWER comes with four hydraulic vises mounted on a central 8"-square tower that has it's own internal hydraulic pumping unit and removable, rechargeable battery pack. 

No more messy hydraulic connections with the PROHOLD® PACHYDERM™.  Just load a charged battery pack in the top of the vise tower and you're good to go.  Batteries recharge in approximately 20 minutes, and can last for days, depending on the frequency of usage.  No more machine down time by pulling a hydraulic pump unit into the machining center after forgetting to disconnect hydraulic hoses. 
Since the PROHOLD® PACHYDERM™ TOWER is hydraulically actuated, its electrical control system allows it to be integrated into an automated cell with a horizontal machining center and robot to load and unload the tower, for a stand-alone, completely unmanned production system.   Or, you can still use its push-button controls to bust those manual vise clusters.   Toss those vise wrenches forever!