CHAPTER VI.

=THE LATHE.=

=Lathe=, the importance and advantages of 129 Classification of lathes 129 Foot 130 Methods of designating the sizes of 130 Bench 130 Power 130 Hand 130 Slide Rest for 131 American form of, their advantages and disadvantages 132 English forms of 132 For spherical work 132 Methods of taking up lost motion of 133 =Engine Lathe=, general construction of 133 The construction of the shears of 134 Construction of the headstock 134 Construction of the bearings 134 Construction of the back gear 135 Means of giving motion to the feed spindle 135 Construction of the tailstock 135 Method of rapidly securing and releasing the tailstock 136 =Lathe Tailstock=, setting over for turning tapers 136 =Engine Lathe=, construction of carriage 137 Feed motion for carriage or saddle 137 =Lathe Apron=, Construction of the feed traverse 138 Construction of the cross-feed motion 138 =Engine Lathe=, lead screw and change wheels of 139 Feed spindle and lead screw bearings 139 Swing frame for lead screw 139 Lead screw nuts 140 With compound slide rest 140 Construction of compound slide rest 141 Advantages of compound slide rest 141 For taper turning 142 Taper-turning attachments 142 With compound duplex slide rest 143 Detachable slide rest 143 Three-tool slide rest for turning shafting 143 With flat saddle for chucking work on 143 =The Sellers Lathe= 143 Construction of the headstock and treble gear 144 Construction of the tailstock and method of keeping it in line 145 Construction of the carriage and slide rest 145 Methods of engaging and disengaging the feed motions 146 =Car Axle Lathe=, with central driving motion and two slide rests 147 The feed motions of 148 =Self-Acting Lathe=, English form of 148 =Pattern Maker's Lathe= 148 Brake for cone pulley 149 With wooden bed 149 Slide rest for 149 =Chucking Lathe=, English 149 Feed motions of 150 =Pulley Lathe= 150 =Gap or Break Lathe= 151 =Extension Lathe= 151 =Wheel Lathe= 151 =Chucking Lathe= for boring purposes 152 =Lathe= for turning crank axles 152 Construction of the headstock 153 Construction of the feed motions 154 For turning crank, Arrangements of the slide rests 154 Application of the slide rest to a crank 155