the CARRiage is moved along the ways by means of the lead screw when threading. or by a separate feed rod when using feeds. on most small lathes. however, a leadscrew-feed rod combination is used. in order to make left-hand threads and reverse the feed, the feed reverse lever is used. this lever reverses the lead screw. it should never bemoved when the machine is running.
the quick-change gearbox()typically has two or more sliding gear shifter levers. these are used to select feed or thrads perinch. on those lathes also equipped with metric selections, the threads are expressed in pitches() the carriage apron() contains the handwheel for hand feeding and a power feed lever that engages a clutch to a gear drive train in the apron.
hand feeding should not be used for long cuts as there would be lash of uniformity and a poor finsh would result. when using power feed and approaching a shoulder or the chuck jaws, diseng a the power feed and hand feed the carriage for the last 1/8 in. or so. the handwheel is used to