ABSTRACT
The production of more complicated parts often requires several settings to obtain the desired accuracy and, in addition, resort must be made to various other methods and aids. The face-plate is used for holding work which cannot be held conveniently in a chuck, for doing operations not suited to the chuck and for finishing work which has been partly turned in the chuck. Many lathe jobs require that the turned surface shall be conical instead of cylindrical in shape, and the production of such a surface is called taper turning. To many persons connected with the lathe—including some teachers of its technique—the be-all and end-all of lathework is the cutting of a screw. Left-hand threads must be cut by reversing the lead-screw so that it rotates opposite to the work, and hence cutting with the tool moving from left to right.
