Our factory has many parts for drilling, tapping and reaming on the lathe. It is both laborious and time-consuming to use the tailstock replacement tool. To this end, we designed a rotary chuck as shown. The outer cone of the taper shank 1 is matched with the taper hole of the lathe tailstock, the taper shank 1 and the rotating cone 5 are clearance fit, the contact slope is 45°, 3 jackets