ed betiveen front bearings of toolhead bars, so as to avoid overhang. Fig. 3—Front view of Hartness automatic chucking lathe with tool headsm place. Cross feed for facing cuts is obtained by airing an angular motion to lower tool head bar. Fig. 4—Change gears of Hartness lathe. Fig. 5—Second op… … 151 OPERATION ON RING GEARS ON12 X 6 HARTNESS AUTOMATIC LATHE what can be done on this machine in the way of rapidproduction, it is stated that on cast iron, cutting speeds of125 ft. p.m. can be maintained on the roughing cut and175 ft. p.m. on the finishing cut. It is not practicable togive…
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