. Railway mechanical engineer . cam shaft on practically allsingle spindle automatic machines, makes one completerevolution for each piece manufactured. To the cam drumor cam disks secured on this shaft the various cams forcontrolling the operations of the machine are secured. Thiscam shaft is driven on the belted machines by a separatebelt, the pulleys or gears being changed to obtain differentspeeds. On motor driven machines the speed is oftenchanged by rheostatic control. An explanation of the usesfor the various cams will be made in order to give an ideaof the work involved when changing f
. Railway mechanical engineer . cam shaft on practically allsingle spindle automatic machines, makes one completerevolution for each piece manufactured. To the cam drumor cam disks secured on this shaft the various cams forcontrolling the operations of the machine are secured. Thiscam shaft is driven on the belted machines by a separatebelt, the pulleys or gears being changed to obtain differentspeeds. On motor driven machines the speed is oftenchanged by rheostatic control. An explanation of the usesfor the various cams will be made in order to give an ideaof the work involved when changing from one job to an-other and not for the purpose of explaining the design ofthe cams. With the machine shown in Fig. 1 the slide on the turretface is made to travel in a horizontal direction by camsC and D, mounted on the left hand drum, working on a rollsecured to bar B. The cam D is for feeding the turret slideup to and over the work and cam C for the reverse direc-tion, the length from the right to the left hand side of these. Fig. 3—An Automatic Clnucl<ing Turret Latiie cams being sufficient to cause the turret to travel the maxi-mum length the machine is designed for. With the machinein question the turret is indexed by separate other forms the indexing is done when the turret is atits extreme right hand travel, similar to hand screw ma-chines. Cams F, f (at the right, but not shown in the il-lustration) on the same drum are for tightening and loosen-ing the chuck or collet, forcing the spring collet into theinclined spindle head or nose E. This does not differ toany great extent from turret lathe practice. The cam G onthe same drum is for feeding the bar, and in this case thecam draws the feed tube backwards over the bar, the weightshown drawing on the chain which forces the feed tube tothe right and feeds the bar as soon as the pin P passesover the peak of the cam. The cam disk K at the rightof the machine is cammed to operate the front and rear€3it-of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
