. Railway mechanical engineer . ig. 4 shows a method of milling throttle quadrant latcheswith a cutter similar to that shown in Fig. 3. The latchesarc Iield in a vise, two rows, six latches in a row, makine12 latches completed in one setting of the machine and withtwo traverses of the table. The time for this operation mill-mg the teeth in 12 latches is 40 min. or about 3 min. perlatch. The cutter is 3 in, in diameter, 1 >4 in. wide, witha lJ4-in. arbor hole and is of carbon steel. Theface of the cutter is formed, on the segment of a circle having 72S 726 RAILWAY MECHANICAL ENGINEER Vol. 93
. Railway mechanical engineer . ig. 4 shows a method of milling throttle quadrant latcheswith a cutter similar to that shown in Fig. 3. The latchesarc Iield in a vise, two rows, six latches in a row, makine12 latches completed in one setting of the machine and withtwo traverses of the table. The time for this operation mill-mg the teeth in 12 latches is 40 min. or about 3 min. perlatch. The cutter is 3 in, in diameter, 1 >4 in. wide, witha lJ4-in. arbor hole and is of carbon steel. Theface of the cutter is formed, on the segment of a circle having 72S 726 RAILWAY MECHANICAL ENGINEER Vol. 93, No, 12 the same center as that of the cutter for cjuadrants, givingthe latch the proper radius on the face, allowing the teethto fit each other and making a much better job than whenthe latch was milled straight. A set of forging machine dies used for manufacturingsuperheater element tubes is shown in Fig. 5. This isdone on a 2-in. Ajax forging machine. The tubes are ofsteel tubing and tlie end is upset with these dies in two. Fig. 4 operations and two heats. The first operation does abouthalf the upsetting and the second operation completes theupsetting and forms the end to its proper shape. The tubesare then taken to a turret lathe and the ball joint is are then taken to the pipe shop where they are bent,threaded elbows applied, and bands applied. This shopmanufactures all superheater unit tubes for renewals, andthey have proved to be just as good or better than those
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
