Atlas & Craftsman Part Number 9-19. Approximately 3/4 x 1 x 1-1/16 overall, ACME 1/2 x 10 Left Hand Threads, 3/8 diameter mounting post. Should fit the following Craftsman & Atlas Lathes: All 9 inch, 10D models and some older 12 inch lathes. If your lathe has a 5/8 diameter leadscrew across the front and.
This taper allows the standard hole in the work to vary according to the usual shop practice and still provides a drive to the work when the mandrel is pressed into the hole. Commercial mandrels are made of tool steel, hardened and ground with a slight taper (usually 0.0005 inch per inch). A mandrel is simply a round piece of steel of convenient length which has been center drilled and ground true with the center holes. Since the mandrel surface runs true with respect to the lathe axis, the turned surfaces of the work on the mandrel will be true with respect to the bore of the piece. Then press the piece on a mandrel tightly enough so the work will not slip while being machined Clamp a dog on the mandrel, which is mounted between centers. The headstock spindles LATHES are made from a special quality of alloy steel manu factured to exacting specifications of analysis and heat treatment.
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