a kind of wooden pulley, making a member of the turner's lathe. Of these there are several kinds; as Flat Mandrels, which have three or more little pegs or points near the verge, and are used for turning flat boards on. Pin Mandrels, which have a long wooden blank to fit into a round hole made in the work to be turned. Hollow Mandrels, which are hollow of themselves, and used for turning hollow work. Screw Mandrels, for turning screws, &c.