Workpiece 1 is located by a V-block and the previously machined surfaces a are accurately located with respect to the slot d to be milled. Surfaces a are set into the vertical position by two floating plungers 3 which are spread by hydraulic plunger 4. Locating surfaces b of the plungers should be strictly vertical. Workpiece 1 is clamped when piston 5 is moved to the left by fluid delivered to the right end of its cylinder. At this, wedge 6, rigidly mounted on the end of the piston rod, actuates roller 2 which turns clamp 7 about fixed axis A to clamp the workpiece. The workpiece is released in the return strokes of plunger 4 and piston 5. At this, clamp 7 turns to an angle of 45° and plungers 3 are pushed inward by springs 8, enabling the workpiece to be removed.
$3881$LHP,GC$