. Railway mechanical engineer . travel ofliyi in., were finished with a feed of 23^ in. per minute forthe body cut and J4 •• I^r minute for the radius at the baseof the tongue. The four rods were completed in 3 hours and45 minutes, including the set-up time, and the spiral cutterwas operating at a speed of 60 ft. per minute. The inside faces of a heavy main rod strap (Fig. 3) wererough milled from the solid block with the 2^-in., threefluted cutter at the rate of one inch per minute. The faceof the cut was 5 3^ in. deep and the total length of the cutin along one side, across the end and out a
. Railway mechanical engineer . travel ofliyi in., were finished with a feed of 23^ in. per minute forthe body cut and J4 •• I^r minute for the radius at the baseof the tongue. The four rods were completed in 3 hours and45 minutes, including the set-up time, and the spiral cutterwas operating at a speed of 60 ft. per minute. The inside faces of a heavy main rod strap (Fig. 3) wererough milled from the solid block with the 2^-in., threefluted cutter at the rate of one inch per minute. The faceof the cut was 5 3^ in. deep and the total length of the cutin along one side, across the end and out along the otherside, was 74 in. In finishing the outside faces of thesestraps, with a depth of cut varying from % in. to 1^ work is performed with a feed of from 1 in. to l^^ )er minute. In these heayj cutting operations the lower endof the cutter is supported in an outboard bearing mountedon a bracket which in turn is bolted to the end of the spindlehousing. In machining the openings in the crosshead end of main. Fig. 2—Milling Jaw in Side Rod Knccl<le Pin Connection rods the cut is prepared by setting up the rods on the miller,drilling a single hole at one corner of the opening, largeenough to receive the helical milling cutter and millingaround the edges as laid out. The solid block is then re-moved without further drilling, leaving sufficient stock onthe surfaces for a smooth finishing cut. This operation wasperformed on a pair of heat treated chrome vanadium steelrods, machined together, in 4 hrs. 30 min., including set-uptime. The opening for the -wrist pin brasses was 6fi by 8 in. long and the wedge slot 2% in- wide by 4%in. long. The face of the cut on the two rods was 104 i-The roughing cut progressed at the rate of % in. per the finishing cut at the rate of IJ^ in. per min. In profiling circular surfaces of rod ends (Fig. 4), therods are drilled and mounted on mandrels centered on thetable and machined by the use of the rotary feed.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
