. Automotive industries . Fig. I—Hartness automatic chucking lathe. Fig. 2—Showing chuck located 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 .ration on ring gear blank, in Fay automatic lathe with pneumatic fixture March 3, 1921 AUTOMOTIVE INDUSTRIES THE AUTOMOBILE 511 FIN BACKFACE-. Fig. (3—First operation on ring gear blank, h Hartness lathe. 151
. Automotive industries . Fig. I—Hartness automatic chucking lathe. Fig. 2—Showing chuck located 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 .ration on ring gear blank, in Fay automatic lathe with pneumatic fixture March 3, 1921 AUTOMOTIVE INDUSTRIES THE AUTOMOBILE 511 FIN BACKFACE-. Fig. (3—First operation on ring gear blank, h Hartness lathe. 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. can be maintained on the roughing cut and175 ft. on the finishing cut. It is not practicable togive cutting speeds for steel, because the hardness ofthe steel varies so much with the treatment it receivesprevious to machining. The maximum dimensions of work that can be handledin this lathe are 12 in. in diameter and 6 in. in of the machine is entirely automatic. All theoperator has to do is to chuck and remove the work andto start the lathe after a piece is chucked. The regularequipment provides for eleven changes of speed, from25 to 135 The feeds for the cutting tools are con-trolled by cams mounted on a large cam drum. This drumis driven by change gears for the feeding movements andis also .driven at high speeds for idle movements. Theclutches and gears are located in a
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
