. Railway mechanical engineer . e vibration as far as possible, and ahall tlirust bearing takes up the heavy working strains. Poweris transmitted to the spindle through a phosphor-bronze driv-ing pinion and a large herringbone gear. This type of drivereduces back lash to a minimum and gives a steady drivingtorciue. The back gears, as well as all change gears, are])ermanently in mesh, and all changes can be performed withrapidity and without danger of engaging more than one setof gears at a time. The spindle drives a large spur gear connected to the feed-reversing mechanism, which is operated f
. Railway mechanical engineer . e vibration as far as possible, and ahall tlirust bearing takes up the heavy working strains. Poweris transmitted to the spindle through a phosphor-bronze driv-ing pinion and a large herringbone gear. This type of drivereduces back lash to a minimum and gives a steady drivingtorciue. The back gears, as well as all change gears, are])ermanently in mesh, and all changes can be performed withrapidity and without danger of engaging more than one setof gears at a time. The spindle drives a large spur gear connected to the feed-reversing mechanism, which is operated from the feeds are obtained by two sets of geared cones,which in turn are actuated by a handwheel and lever on theheadstock. The carriage longitudinal and cross feeds areeffected Ijy independent sets of worm gears which are engagedIjy large friction cones. The positive feeds consist of a largesplit nut made of phosphor-bronze and an effective safetydevice is provided. One lever on the apron (ontnils the start-. Motor Driven Engine Lathe Designed for High Production ing motor drive. In the latter arrangement the motor is boltedto the bed and the armature shaft connected directly to themain driving shaft,,doing away with Ijelts, tension idlers andchain drives. The changing from belt to motor drive or viceversa can be made at anv time and at a small cost. ing. stojjping and reversing of the spindle, and one lever con-trols the engaging, tripjjing and reversing of the ■\rrangement is made to automatically trip either the frictionor the positive feeds at any point along the carriage attention has been paid to the cross sections and 412 MECHANICAL ENGINEER Vol. 94, No. 6 proportions of the ways of the bed. The guiding surface ofthe vees is inclined at 15 deg. to the perpendicular and thesupporting surface at 15 deg. to the horizontal. The verticaldepth is at least twice as great as in the usual construction and, due to the broad s
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
