Fig. 5. Elevation of Turret and Tools for Finishing Flywheels—First Operation
The outside of the wheel rim is next finish-turned with cutter V ([Fig. 5]) held in an extension turret tool-holder the same as the roughing tool T. At the same time, the bore is finished by a cutter in boring-bar D ([Fig. 4]). The side of the rim and the hub of the wheel are also finished at this time by two facing cutters H and K, held in tool-holders on the face of the turret. When the finishing cuts on the rim and hub are being taken, the work is supported by a bushing on the boring-bar which enters the bore of the wheel, the boring cutter and facing tools being set in such relation to each other that the final boring of the hole is completed before the facing cuts are taken.
The web of the wheel is next finish-faced with the facing cutter held in the holder E, and the taper surface on the inside of the rim is finished by the tool L, at the same time. While these last operations are performed, the work is supported by a bushing on a supporting arbor J, which enters the bore of the wheel. The bore is finally reamed to size by a reamer F held in a “floating” reamer-holder. When the reaming operation is completed, a clearance groove N is cut on the inside of the rim, using a tool G held in the carriage toolpost. The first cycle of operations on the flywheel is now completed.
Fig. 6. Second Cycle of Operations on Flywheel
The flywheel is then removed from the chuck, turned around, and held in “soft” jaws for the second cycle of operations, the jaws fitting the outside of the wheel rim. (Soft unhardened jaws are used to prevent marring the finished surface of the rim.) The operations on this side are very similar to those performed on the other side. First, the side of the rim, the inside of the rim, the web, and hub are rough-turned, using tools held in the carriage toolpost. The inside of the rim and the web are then finished by a cutter held in a tool-holder at P, [Fig. 6], which is bolted to the face of the turret. The work is supported during this operation by a bushing held on a supporting arbor U, having a pilot which enters a bushing in the chuck. Finally, the rim and hub are finished, by the facing cutters R and S, the work being supported by an arbor, as before.
These operations illustrate the methods employed in automobile factories, and other shops where large numbers of engine flywheels, etc., must be machined.