. Railway mechanical engineer . and conductivity. The side and front angles of the double cutter are alwayscorrect, as fixed by the manufacturer, and sharf>ening isaccomplished by grinding the top surface at the requiredangle. Allowing 1/32 in. for each grinding, the cutter canbe ground 20 times on each side, as shown at A, Fig. 2, cally ground down to nothing at the cutter point, therebyeconomizing on high-speed steel. A unique feature is thevertical offset of the cutter holding bolts with respect to theholder center line which, by turning the tool-holder over,provides for adjusting the cu
. Railway mechanical engineer . and conductivity. The side and front angles of the double cutter are alwayscorrect, as fixed by the manufacturer, and sharf>ening isaccomplished by grinding the top surface at the requiredangle. Allowing 1/32 in. for each grinding, the cutter canbe ground 20 times on each side, as shown at A, Fig. 2, cally ground down to nothing at the cutter point, therebyeconomizing on high-speed steel. A unique feature is thevertical offset of the cutter holding bolts with respect to theholder center line which, by turning the tool-holder over,provides for adjusting the cutting point to the proper heightas it wears down. Another important feature is that tooldressing expense is eliminated, the cutters being purchasedfrom the manufacturer who makes them in quantity and December, 1922 RAILWAY MECHANICAL ENGINEER 727 naturally knows what heat treatment will give the best results. In the railroad shop tests referred to, the No. 12 tool, illustrated in Fig. 1, was first used in roughing down a Fig. 4—No. 18AA Roughing Tool In Driving Wheel Latlie Steel engine truck axle. The lathe was driven by a beltwhich started to slip before a fair chip could be taken. Thebelt slack was then taken up and a roughing cut taken, as illustrated. The reduction on the axle in this case was 1^in., the depth of cut being }i in. and the feed 1/16 in. Aspeed of SO ft. per min. was maintained. At the highestcapacity of this belt-driven lathe the tool showed no signsof distress. In Fig. 3 a No. tool was put in the car wheel latheand a pair of 36-in. steel car wheels applied ready for turn-ing the tires. On the roughing cut, a feed of ^ in. was used,the depth of cut being J4 in. and the speed 11 ft. per roughing cut was taken up to the flange and the flangeturned to the proper height in 15 min., two roughing toolsbeing used and two tires turned at the same time. Thesetires were finished with the usual forming tools held in thewheel lathe turret, 10 min.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
