CHAPTER VIII.

=SPECIAL FORMS OF THE LATHE.=

=Watchmaker's Lathes= 188 Construction of the headstock 188 Construction of chucks for 188 Expanding chucks for 188 Contracting chucks for 188 Construction of the tailblock 189 Open spindle tailstocks for 189 Filing fixture for 189 Fixture for wheel and pinion cutting 189 Jewelers' rest for 189 =Watch Manufacturers' Lathe= 190 Special chucks for 190 Pump centre rest 190 =Lathe=, hand 191 Screw slotting 192 With variable speed for facing purposes 192 Cutting-off machine 193 Grinding Lathes 193 With elevating rest 194 Universal 195 Special chucks for 196 The Morton Poole calender roll grinding lathe 196 The construction of the bed and carriages 197 Principles of action of the carriages 197, 198 Construction of the emery-wheel arbors and the driving motion 198, 199 The advantages of 199 The method of driving the roll 200 Construction of the headstock 200 The transverse motion 200 =The Brown and Sharpe Screw Machine=, or screw-making lathe 200 Threading tools for 203 Examples of the use of 203 =The Secor Screw Machine=, construction of the headstock 204 The chuck 205 The feed gear 205 The turret 205 The cross slide 205 The stop motions 206 =Pratt and Whitney's Screw Machine= 206 Parkhurst's wire feed, construction of the headstock, chuck and feed motion 207 Box tools for 208 Applications of box tools 208 Threading tool for 208 Cutting-off tool for 208 =Special Lathe= for wood working 208 The construction of the carriage and reducing knife 209 Construction of the various feed motions 209 Construction of the tailstock 209 =Lathes for irregular forms= 210 Axe-handle 210 Back knife gauge 210 Special, for pulley turning 211 =Boring and Turning= mill or lathe 211 Construction of the feed motions 213 Construction of the framing and means of grinding the lathe 214 Construction of the vertical feed motions 215 =The Morton Poole= roll turning lathe 215 Construction of the slide rest 216 The tools for 216 =Special Lathes= for brass work 216, 217 =Boring Lathe= with traversing spindle 218 For engine cylinders 219 Cylinder, with facing slide rests 219 With double heads and facing rests 220 =Lathe for turning Wheel= hubs 221