Workpiece 1 is located by its three parallel cylindrical surfaces of which two bear against a flat surface of the body and the third is located by V-block 3. Workpiece 2 is located by two perpendicular V-blocks 4 and 5. When piston 6 moves downward by the action of fluid delivered to the top end of the cylinder, rocker arm 7, connected by turning pair A to the piston rod, actuates plungers 8 so that the workpieces are clamped and located by V-blocks 3 and 4. Plungers 8 are retracted with the V-blocks by springs 9 to release the workpieces.
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