Abstract: A cutting tool chuck holds a collet so as to be easily changed. In the cutting tool chuck, a fastening collar (12) is screwed on a chuck sleeve (14). The fastening collar (12) is provided with an internal guide groove (24), deep recesses (24a) formed in a side surface of the guide groove (24), and shallow recesses (24b) formed in the same side surface. A drive shaft (16) is axially slidably fitted in the chuck sleeve (14) with end portions (26a) of a drive shaft control member (26) laterally projecting from the drive shaft (16) and fitted in the guide groove (24). A collet (20) is detachably mounted on the front end of the drive shaft (16). The fastening collar (12) is turned so as to position the end portions (26a) of the drive shaft control member (26) at positions on the side surface of the guide groove (24) other than the deep recesses (24a) to hold the collet (20) on the drive shaft (16).

Abstract: A vacuum chuck for a lathe, including a vacuum connector assembly to be mounted within a spindle bore of a lathe. A tapered portion of an outer end of a vacuum tube centrally locates the outer end of the vacuum tube in a spindle bore. A resilient sleeve is radially expanded over a tapered inner end of the vacuum tube, within the spindle bore, centralizing the vacuum tube radially within the spindle bore, fastening the vacuum tube securely within the spindle bore, and sealing off the space between the vacuum tube and the inner surface of the spindle bore.