Fixture for disk parts with radial slots - has high-pressure oil jet to force workpiece against location surface of positioning fingers

摘要

The fixture provides precise locatoin for the finish machining of disk like parts with one or more radial slots and with or without a central hole. The workpiece or workpiece stack (21) is first approximately located on the worktable. Then positioning fingers (4,20) and a central mandrel are lowered into position in the workpiece slots and central hole with clearance in the region of 0.1 to 0.5 mm. A shoulder on the mandrel lightly nips the workpiece to prevent accidental movement. Oil under pressure is then admitted through passages (8,9) and orifices (10,11) to push against sides (12) and (13) of the workpiece slots, thus moving the workpiece bodily and bringing the opposite surfaces (16) and (17) of the slots firmly against the hardened location surfaces (18,19) of the positioning fingers (4). Finally the workpiece is clamped and the positioning members withdrawn. USE/ADVANTAGE - Workpiece can be located within 2 micron.