Collet stop apparatus

The apparatus includes a body (222) that fits within the bore of a collet (228). An expandable sleeve (223) slides over the body (222). The body (222) includes a flange (240) on one end. A nut (224) is threaded over the other end of the body, with the sleeve (223) disposed between the flange (240) and the nut (224). As the nut is threaded toward the flange (240), the sleeve (223) is wedged between the flange (240) and nut (224), and forced to expand against the collet (228), thereby to fix the position of the stop apparatus body (222) relative to the collet (228). A rod (226) is slidable within the stop apparatus body (222) and may be locked in position relative to the body (222) for providing a stop face (235) for limiting penetration of a work piece (241) that is held by the collet (228).