Chapter XII: =examples in Lathe Work.=

=Technical Terms= used in the work 296
=Lathe Centres= 296
Devices for truing 297
Tools for testing the truth of, for fine work 298
Shapes of, for light and heavy work 299
=Centre Drilling=, attachment for lathes 300
The error induced by straightening work after 300
Machine 300
Combined centre-drill and countersink 300
Countersink with adjustable drill 300
Centring square 300
Centre-punch 300
Centre-punch guide 301
Centring work with the scribing block 301
Finding the centre of very rough work 301
Centre-drill chuck 302
The proper form of countersink for lathe work 302
Countersinks for lathe work 302
Various forms of square centres 303
The advantage of the square centre for countersinking 303
Novel form of countersink for hardened work 303
Chucks for centre-drilling and countersinking 303
Recentring turned work 304
=Straightening Work.= Straightening machine for bar iron 304
Hand device for straightening lathe work 305
Chuck for straightening wire 305
=Cutting Rods= into small pieces of exact length, tools for 305
=Roughing cuts=, the change of shape of work that occurs
from removing the surface by 306
Feeds for 306
Rates of feed for 307
=Finishing Work=, the position of the tool for 307
Finishing cast-iron with water 307
Specks in finished cast-iron work 307
Scrapers for finishing cast-iron work 307
Method of polishing lathe work 308
Filing lathe work 308
The use of emery paper on lathe work 308
The direction of tool feed in finishing long work 309
Forms of laps for finishing gauges or other cylindrical lathe
work 310
Forms of laps for finishing internal work 311
Grinding and polishing clamps for lathe work 311
Burnishing lathe work 311
=Taper Work=, turning 312
The wear of the centres of 312
Setting over the tailstock to turn 312
Gauge for setting over 313
Fitting 313
Grinding 313
The order of procedure in turning 313
The influence of the height of the tool in producing true 314
=Special Forms.= Curved work 314, 315
Standard gauges for taper work 316
Methods of turning an eccentric 317
Turning a cylinder cover 318
Turning pulleys 318
Chucking device for pulleys 318
=Cutting Screws= in the lathe 319
The arrangement of the change gears 319
The intermediate wheels 319
The compounded gears 320
Finding the change wheels to cut a given thread 320
Finding the change wheels for a lathe whose gears are
compounded 321
Finding the change gears for cutting fractional pitches 321
To find what pitch of thread the wheels already on the lathe
will cut 322
Cutting left-hand threads 322
Cutting double threads 322
Cutting screws whose pitches are given in the terms of the
metric system 322
Cutting threads on taper work 323
Errors in cutting threads on taper work 324