. Railway mechanical engineer . finish the work in the foregoing se-quence is 8 minutes. It requires two chuckings to finishwork all over, the second chucking consisting of roundingthe end and threading surface E. Reducing Valve Stem A reducing valve stem, as shown in Fig. 6, can be finishedcomplete in one chucking from a steel bar on a 2 54 in. by 26in. combination flat turret lathe equipped for bar work.(1) The stock is fed against the bar stop bracket. (2)Surface A is turned by cutter held in a universal turner atthe first turret position. (3) Surface B is turned and endD is rounded by cutt
. Railway mechanical engineer . finish the work in the foregoing se-quence is 8 minutes. It requires two chuckings to finishwork all over, the second chucking consisting of roundingthe end and threading surface E. Reducing Valve Stem A reducing valve stem, as shown in Fig. 6, can be finishedcomplete in one chucking from a steel bar on a 2 54 in. by 26in. combination flat turret lathe equipped for bar work.(1) The stock is fed against the bar stop bracket. (2)Surface A is turned by cutter held in a universal turner atthe first turret position. (3) Surface B is turned and endD is rounded by cutters held in a multiple cutter roller the fourth turret position, (o) The corner of surface Eis rounded and the work i- cut oft by cutters held in a slidetool at the fifth turret position. The time required to finishcomplete is 11 minutes. Prosser Flue Expamler Machining a prosser flue expander from a steel bar canbe accomplished in one chucking on a 2% in. by 11 in. handscrew machine in the following sequence of operations: (1). Fig. 7—Tooling of Hand Screw Machine for Making Prosser Flue Expander The stock is fed up to the bar stop held in the first turretposition. (2) Surface A is turned by a cutter held in auniversal turner bolted to the turret face at the secondturret position as shown in Fig 7. (3) Hole C is drilledby a drill held at the third turret position. (4)Hole B is drilled by drill held in fourth turret position.(5) Contour D and groove E are formed by cutters heldin a form block bolted on the front of the cut C B iir- L 1 II- -iBi- ~
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
