nes. The latest improvements .in thisdirection being to first turn the blanks and then roll thethreads on thread rolling machines. THE MODERN CLOCK. 243 The pinion arbors, after they have been cut to length, arecentered on one end by a milling machine having a conicalcutter made for the purpose.… … Fig. 76. Slide Gauge Tools and Rack. stances, is all that is necessary to hold them. At one timeit was the practice to drive these collets by hand. One wasplaced on the point of the arbor, and the point was thenplaced over a piece of steel, with a series of holes in itof such depths that the…
Clocks and watches
Internet Archive · Boston Library Consortium · Public Domain Mark 1.0. Free to use for anything.
