lathe-bearer

(lavH’bar’ér), n. Same as lathe- carrier. The grinder is laid upon the lathe-bearers or other support. O. Byrne, Artisan’s Handbook, p. 140, lathe-carrier (laru’kar’i-ér), ». An appliance fastened to an object under operation in a lathe. It causes the object to rotate with the mandrel and faceplate of the live head by means of a projection which collides with the stud or pin on the latter. Also called lathedog, lathe-bearer. lathe-center (latH’sen’tér), ». A piece of hardened steel, round and tapered, having the smaller end cut off squarely and the larger end of the form of a cone. One of these centers is fitted to a socket in the nose of the mandrel of the live headstock, and the other into a socket in the spindle of the dead head-stock: The former is called the live-center; the latter, the dead-center. The piece to be turned (for example, a piece of shafting) is prepared for placing in the lathe by centrally countersinking the ends. The conical ends of the lathe-centers are made to engage the countersunk ends of the piece in the countersinks, and the spindle of the dead head-stock is then clamped in position, The piece to be turned is then clamped to the mandrel by means of a chuck or a Jathe-carrier. The spindle of the dead head-stock is usually provided with an adjusting screw and a clamping-screw by which the dead-center is adjusted to and firmly held in position.