CHAPTER IX.

=DRIVING WORK IN THE LATHE.=

=Drivers=, carriers, dogs, or clamps, and their defects 222 Lathe clamps 222 Equalizing drivers 223 The Clements driver 223 Driver and face plate for screw cutting 223 Forms of, for bolt heads 224 Adjustable, for bolt heads 224 For threaded work 225 For steady rest work 225 For cored work 225 For wood 225 =Centres= for hollow work 226 For taper work 226 =Lathe Mandrels=, or arbors 227 Drivers for 227 For tubular work 227 Expanding mandrels 227 With expanding cones 228 With expanding pieces 228 Expanding, for large work 228 For threaded work 228 For nuts, various forms of 229 For eccentric work 229 =Centring devices= for crank axles 230 =The Steady Rest= or back rest 231 Steady rest, improved form of 232 Cone chuck 232 Steady rest for square and taper work 233 The cat head 233 Clamps for 233 Follower rests 234 =Chucks and Chucking= 234 Simple forms of chucks 234 Adjustable chucks for true work 235 Two-jawed chucks 236 Box body chucks 237 Reversible jawed chucks 237 Three and four-jawed chucks 237 Combination chucks 237 The wear of scroll chuck threads 237 Universal chucks 238 The wear of chucks 240 Special forms of chucks 241 Expanding chucks for ring-work 241 Cement chuck 241 Chucks for wood-working lathes 242 =Lathe Face Plates= 243 Face plates, errors in, and their effects 243 Work-holding straps 244 Face plate, clamping work on 245 Forms of clamps for 245 Examples of chucking work on 246, 247 For wood work 247 =Special Lathe Chuck= for cranks 248 =Face Plate Work=, examples of 249 Errors in chucking 250 Movable dogs for 250 The angle plate 251 Applications of 251 Angle plate chucking, examples of 251 Cross-head chucking 251-253