Chapter VII: =details in Lathe Construction.=

=Live Spindle= of a lathe, the fit of 157
With coned journals 157
Methods of taking up the end motion of 158
Arranging the swing frame for the change gears 158
Taking up the wear of the back bearing 158
The wear of the front bearing of 158
=The Taper= for the live centre 159
=Methods= of removing the lathe centres 159
=Tapers= for the live centres 159
=Methods= of removing the dead centre 159
=Driving Cone=, arranging the steps of 159
Requirements of proportioning the steps of 159
Rules for proportioning the diameters of the steps of, when the
two pulleys are exactly alike and are connected by an open
belt 159 to 161
When the two pulleys are unlike 161 to 164
=Back Gear=, methods of throwing in and out 165
=Conveying= motion to the lead screw 165
=Attaching= the swing frame 166
=Feed Gear.= Arrangement for cutting worm threads or tangent
screws 167
=Feed Motion= for reversing the direction of tool traverse
in screw cutting 168
For lathe aprons 168
=Slide Rest=, weighted elevated 168
Double tool holder for 169
Gibbed elevating 169
=Examples= of feed motions 170
=Feed Regulators= for screw cutting 171
The star feed 172
=Ratchet Feeds= 173
=Tool Holding= devices, the various kinds of 173
=Tool Rest= swiveling 174
=Tool Holder= for compound slide rests 174
For octagon boring tools 175
=Lathe Lead and Feed Screws= 175
Lead screws, supporting, long 176
Position of the feed nut 177
Form of threads of lead screws 177
The effect the form of thread has in causing the nut to lock
properly or improperly 177
Example of a lead screw with a pitch of three threads per inch 177
Example of a lead screw with five threads per inch 178
Example with a lead screw of five threads per inch 179
Device for correcting the errors of pitch of 179
=Table= for finding the change wheels for screw cutting when
the teeth in the change wheels advance by four 180
For finding the change wheels when the teeth in the wheels
advance by six 180
Constructing a table to cut fractional threads on any lathe 181
Finding the change wheels necessary to enable the lathe to cut
threads of any given pitches 181
Finding the change wheels necessary to cut fractional pitches 181
=Determining= the pitches of the teeth for change wheels 182
=Lathe Shears= or beds 182
Advantages and disadvantages of, with raised V-guide-ways 182
Examples of various forms of 183
=Lathe Shears= with one V and one flat side 183
Methods of ribbing 184
The arrangement of the legs of 184
=Lathe Tailblock= 185
With rapid spindle motion 185
With rapid fastenings and releasing devices 185
The wear of the spindles of 185
Spindles, the various methods of locking 186
Testing, various methods of 187