Attachment of workpieces on a lathe

A kit of components for use in attaching and securing workpieces on a lathe having a rotary driven shaft, said workpieces comprising hubless brake drums and rotors of various sizes, each of which is provided with an end wall with a central hole therein, said kit being adapted to attach and secure said workpieces in a manner such that said end wall is maintained in a position substantially perpendicular to the axis of rotation of the shaft, said kit comprising:

• (a) an arbor mount comprising a substantially cylindrical tube portion with an enlarged terminal member at one end thereof, said arbor mount having a central bore therethrough such that the axis of the central bore of the arbor mount is substantially coincident with the axis of the tube portion, said central bore of the arbor mount being adapted to receive the shaft in sliding engagement therewith so that said arbor mount may be positioned over the shaft;
• (b) a first backing plate having a generally circular configuration with a first side and a second side and a central hole therethrough, which hole has a diameter that is greater than the outside diameter of the tube portion of the arbor mount so that said tube portion will pass through the central hole of the first backing plate, said first side of said first backing plate being adapted to receive in mating relationship the terminal member of the arbor mount, said first backing plate being adapted to be positioned over the tube portion of the arbor mount in mating relationship with the terminal member thereof, behind a workpiece;
• (c) a second backing plate having a generally circular configuration with an outside diameter greater than that of the first backing plate, said second backing plate having a first side and a second side and a central hole therethrough, which hole has a diameter that is greater than the outside diameter of the tube portion of the arbor mount so that said tube portion will pass through the central hole of the second backing plate, said first side of said second backing plate being adapted to receive in mating relationship the terminal member of the arbor mount, said second backing plate being adapted to be positioned over the tube portion of the arbor mount in mating relationship with the terminal member thereof, behind a workpiece;
• (d) a first centering cone having a larger end and a smaller end, and having a central bore therethrough such that the axis of the central bore of said first centering cone is substantially coincident with the axis of the cone, said bore of the first centering cone being adapted to receive the tube portion of the arbor mount in sliding engagement therewith, said first centering cone being adapted to be positioned over the tube portion of the arbor mount with its smaller end preceding its larger end and secured against the end wall of a workpiece;
• (e) a second centering cone having a larger end and a smaller end, and having a central bore therethrough such that the axis of the central bore of said second centering cone is substantially coincident with the axis of the cone, said bore of the second centering cone being adapted to receive the tube portion of the arbor mount in sliding engagement therewith, said second centering cone having a diameter at its larger end that is greater than the diameter at the larger end of the first centering cone, said second centering cone being adapted to the positioned over the tube portion of the arbor mount with its smaller end preceding its larger end and secured against the end wall of a workpiece;
• (f) means for securing a centering cone on the tube portion of the arbor mount against the end wall of a workpiece;
• (g) a compression cup having a base portion and a sidewall extending from the periphery thereof, said base portion having a central hole therethrough that is adapted to receive the tube portion of the arbor mount, and said sidewall terminating in a peripheral edge that is located so as to correspond with the periphery of the first backing plate, said compression cup being adapted to be positioned and secured over the arbor mount so that compressive forces may be applied to the end wall of a workpiece between the peripheral edge of the sidewall of the cup and the periphery of the first backing plate;
• (h) means for securing the compression cup over the arbor mount.