Fig. 505.
[Fig. 505] represents a 28-inch swing lathe by the Ames Manufacturing Company, of Chicopee, Massachusetts. It is provided with the usual self-acting feed motion and also with a compound slide rest. The swing frame for the studs carrying the change wheels for screw cutting here swings upon the end of the lead screw, the same spindle that carries the driving cone for the independent feed rod which is in front of the lathe, also carries the driving gear for the change wheels used for screw cutting.
Fig. 506.
Fig. 507.
The construction of the compound rest is shown in [Figs. 506] and [507]. n is the nut for the cross-feed screw (not shown in the cut) and is carried in the slide a. a and the piece l above it are virtually in one, since the latter is made separate for convenience of construction and then secured to it firmly by screws. b is made separate from c also for convenience of construction and fixed to it by screws; l is provided with a conical circular recess into which the foot b of c fits. e is a segment of a circle operated by the set screw f to either grip or release b. The bolt d simply serves as a pivot for piece b c; at its foot c is circular and is divided off into the degrees of a circle to facilitate setting it to any designated angle.