MACHINE-SHOP PRACTICE 



425 



etc. These products are cut and turned from round bar 

 stock. 



The speed lathe is specially designed for high-speed work 

 hence its name. It is employed mainly for such opera- 



FIG. 198. Engine Lathe. 



A. Reverse 



B Back Gear Lever 



C Back Gears 



D Spindle Cone 



F Face Plate 



G Saddle 



H Tool Post 



Ball 



7 Compound Rest R Cross-Feed 



J Tail-Stock Crank 



K Tail-Stock Hand- S Cross-Feed Lever 



Wheel Knob 



L Lathe Bed T Apron Nut Cam 

 O Apron Hand-Wheel U Rack 



Q Apron Clutch F Lead Screw 



tions as center drilling, polishing, reaming, and hand-turning 

 small pieces of work. 



489. Size of Lathe. The size of the lathe is expressed 

 by stating the length of the bed, and the largest diameter it 

 will swing on centers. The "swing" is found by measuring 

 from the point of the head-stock center to the "ways" on 

 the bed, and multiplying by two. The length of a lathe's 



