The accompanying drawing shows the way in which a die sinker may be equipped for cutting keyways in piston rods and valve stems and drift holes in drill and milling-machine sockets. Every machinist knows that it is quite a job to drill, chip, and rile a keyway in a piston rod or valve stem. A device of this kind has proved itself to be just the thing for such work, and it can be made in any "one-horse" shop with very little cost.

Cutting keyways on a die sinker

Fig. 147 - Cutting keyways on a die sinker.

Fig. 147 shows the device and the way in which the work is clamped. Stand A is machined, and a dovetail is cut across it-bottom to fit the dovetail of the knee of the machine. Slide B is machined to fit the top of . A, and slotted crank disk C is attached to shaft D. A T-slot is cut half way across the face of the disk (' to receive an adjustable crank-pin, which gives the slide B the stroke required for the keyways. Bracket E is attached to the side of the die sinker to receive a short shaft, one end of which carries pulley F, while the other end is connected by a universal coupling to the shaft D. Belt G passes over the driving shaft of the die sinker and around the pulley F, which drives the work to and fro while the keyway is being cut. The machine spindle is run at the required speed, and while the work is moving back and forth under the cutter it is fed up into the cutter by means of the elevating screw of the die sinker. This device is simple and practical in its construction, and is now used with perfect satisfaction in the shop where the writer works.