[Illustration: Fig. 113]
[Illustration: Fig. 114]
The piece _H_ can be permanently attached to the rod _F_. We show
separate at Figs. 113 and 114 the slide _G N_ on an enlarged scale from
Fig. 109. Fig. 114 is a view of Fig. 113 seen in the direction of the
arrow _e_. All joints and movable parts should work free, in order that
the center _I_ may be readily and accurately set. The parts _H F_ are
shown separate and enlarged at Figs. 115 and 116. The piece _H_ can be
made of thick sheet brass securely attached to _F_ in such a way as to
bring the V-shaped groove at right angles to the axis of the rod _F_. It
is well to make the rod _F_ about 1/8" in diameter, while the sliding
center _I_ need not be more than 1/16" in diameter. The cone point _n_
should be hardened to a spring temper and turned to a true cone in an
accurately running wire chuck.
[Illustration: Fig. 115]
[Illustration: Fig. 116]
The hollow cone end _m_ of _I_ should also be hardened, but this is best
done after the hollow cone is turned in.
Pages:
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214