. Railway mechanical engineer . d, thusproviding a hard bearing surface without impairing thestrength. The apron is of the usual double wall or boxconstruction. The thread dial is placed at the right of theapron and can be readily disengaged from the lead screwwhen not in use. The new type of patented geared head for the machineillustrated now contains only 16 gears and three shafts be-sides the spindle, to produce the entire range of 16 spindlespeeds. These speeds are in geometrical progression and arecalculated to provide a proper cutting speed for all diame-ters likely to be turned on a 36-
. Railway mechanical engineer . d, thusproviding a hard bearing surface without impairing thestrength. The apron is of the usual double wall or boxconstruction. The thread dial is placed at the right of theapron and can be readily disengaged from the lead screwwhen not in use. The new type of patented geared head for the machineillustrated now contains only 16 gears and three shafts be-sides the spindle, to produce the entire range of 16 spindlespeeds. These speeds are in geometrical progression and arecalculated to provide a proper cutting speed for all diame-ters likely to be turned on a 36-in. lathe. The entire designand construction of the head makes it adaptable to the heavi-est class of lathe work, such as is found in railway shops,steel mills, etc. The greatest speed reduction tlirough theface plate drive is 237 to 1, and this unusually high ratiogives some idea of the available power. At the normalcountershaft speed the belt will deliver from 30 to ii hp. The lathe mav be arranged for motor drive h\ mounting. The American 36-ln. Heavy Geared Head Lathe hand, and the cutter is supported on the bottom and backedup against the feed of the cut. The cutter is held by hollow-set screws and there are no projecting screw heads to inter-fere with the proper setting of the holder in the tool holder is case-hardened inside and out, making it bothrigid and dural)le. a constant speed motor either of the direct or alternatingcurrent t\pe on top of the geared head. The motor is con-nected to the main driving shaft through three spur apron control is furnished, tlie motor can be startedand stop[>ed by means of a controller handwheel conveni-ently located on the right end of the carriage. The size of JuxE, 1918 RAILWAY MECHANICAL EXGIXEER 363 the motor depends upon the nature of the work to be han-dled and it is usually specified by the customer after athorough investigation of the uses to which the lathe is tobe put. All head gears run in oil. All the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
