. Railway mechanical engineer . ut 16 diameter by about 12 in. long. Their principal use inrailway work is the manufacture of special cocks and valvesused on locomotives, air pump piston heads and packingrings, nuts for side and main rods, oil or grease cups madefrom forgings or castings, parts for metallic packing, watergage parts, boiler fittings, piston rod and other nuts, pistonpacking rings and parts, nuts for flexible staybolts, knucklepins and bushings, or generally speaking, any articlefinished from castings or forgings within the size capacityof the machine, which are made in qu
. Railway mechanical engineer . ut 16 diameter by about 12 in. long. Their principal use inrailway work is the manufacture of special cocks and valvesused on locomotives, air pump piston heads and packingrings, nuts for side and main rods, oil or grease cups madefrom forgings or castings, parts for metallic packing, watergage parts, boiler fittings, piston rod and other nuts, pistonpacking rings and parts, nuts for flexible staybolts, knucklepins and bushings, or generally speaking, any articlefinished from castings or forgings within the size capacityof the machine, which are made in quantities of SO or moreat a time. The tools used on these machines differ materially fromthose used on automatic screw machines, principally be-cause the work is larger and made from castings or tools in many respects resemble those used on thelarger turret lathes for similar work. When the machinesare purchased they may be equipped with various forms oftool holders, turning tools and devices, which make it possi-. Fig. 14 Fig. 15 Fig. 16 Operations in Turning an Air Pump Piston Head Fig. 17 of these sleeves it would not be necessary to change thecams. To make set screws or similar articles would prob-ably require a complete change of collets, feed fingers andcams on the drum for feeding the tool slide. THE AUTOMATIC CHUCKING MACHINE The automatic chucking machine, shown in Fig. 3, is usedmostly for machining castings and forgings. It differs from ble successfully to machine a large variety of work withoutdesigning special tools. The cutting tools are generallymade from square high speed steel, similar to the bits usedin lathe tool holders. One form of turning tool holder, shown in Fig. 13, isused quite extensively. This, as shown, may be securedto the face of the turret by four bolts, the outer face beingdrilled and reamed to take tool holding bars such as those June, 1919 RAILWAY MECHANICAL ENGINEER 309 shown in Fig. 18, which in turn hold the high speed cutting
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
