Fig. 711.
The stop motion for the forward motion of m, and that therefore determines the length of turret traverse forward, and hence the distance each tool shall carry its cut along the work, is shown in [Fig. 711]. The end of the screw a abuts against the stop b in the usual manner; it is, however, threaded through the eye of a bolt c, as well as through the end of the turret slide, so that it may be locked by simply operating the nut d. Thus the use of a wrench is obviated, and the adjustment is more readily effected.
Fig. 712.
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Fig. 713.
[Figs. 712] and [713] represent a screw machine by the Pratt and Whitney Company, of Hartford, Connecticut, and having Parkhurst’s patent wire or rod feed for moving the work through the hollow spindle and into position to be operated upon by the tools. The reference letters correspond in both figures.