. Railway mechanical engineer . lled 1/04 in. largerthan the segments are to be cut. By using a triple head andthree we can mill .56 expanders at one setting, mak-ing body -4 long enough to hold 12 instead of eight. Thesame feed is used with three cutters, as the machine candrive them with ease. By using this we save on oneoperation alone five segments out of eight; that is, we canrip eight with this jig as quickly as we could rip three withthe old mandrel. Another advantage is that when the eightsegments are finished they are all separate segments. On theold style mandrel t
. Railway mechanical engineer . lled 1/04 in. largerthan the segments are to be cut. By using a triple head andthree we can mill .56 expanders at one setting, mak-ing body -4 long enough to hold 12 instead of eight. Thesame feed is used with three cutters, as the machine candrive them with ease. By using this we save on oneoperation alone five segments out of eight; that is, we canrip eight with this jig as quickly as we could rip three withthe old mandrel. Another advantage is that when the eightsegments are finished they are all separate segments. On theold style mandrel there are three to break apart, then grindor file. Jig L sed in Milling laps and Reamers A sjjecial jig, Fig. 5. was designed so that three spiralreamers can be milled at the same time. The angle plate /is made of cast iron; the spindles or centers are made of24 in. tool steel hardened and drawn. The inside centerremains stationary, while the other two can be moved in andout. The three head centers are all movable. The object in. Fig. 5—Tap and Reamer Milling Jig having the spindles or centers move in or out is to make eachof the three milling cutters stop at the head of the reamerswhen milling spiral flutes. The spindles and centers canbe adjusted .so (hat any ordinarj spiral can be cut on areamer. The center spindle ^ is placed in the socket of theindex head and is geared to the other two, so that all threewill rotate in the same direction. The dead centers areplaced in a single stand, two set screws j?, tx-ing tolock tiic three dead centers. The gears are cut .sjiiral, thusovercoming practically all lost motion. The two back livespindles are graduated .so that when reamers are milled toht dejrrees or any other spiral, the spindle can Ix: setlore the reamers are placed in the jig so that the cutterswill the end of the flute at the same time. When the jig is ready for operation the index head turnsind the reamers turn with it, just as if all was solid. TheDing cut
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
