WORKPIECE STOP ASSEMBLY FOR CONTRACTING COLLET CHUCKS

摘要

The application discloses a workpiece stop assembly for use in connection with contracting collet chucks. The stop assembly is received internally of the chuck and has a fixed position with respect to the spindle of the lathe or screw machine with which the chuck is associated. When a workpiece is received in the chuck, its inner end is seated against the workpiece stop before the collet chuck is actuated. The collet chuck is closed upon the workpiece by reason of an axial withdrawing movement of the chuck. Normally this can result in an undesirable axial shifting of the workpiece. However, the workpiece is prevented from axial displacement by reason of the workpiece stop, which remains fixed in its position while the chuck moves axially to grip the work. The workpiece stop assembly of the present invention is especially adapted for use in association with collet chucks intended for the gripping of workpieces of smaller diameter.