Machinery's Handbook - 5: Finding Major Diameter
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WARNING: Machine tools present a safety hazard. Improper operation can result in severe injury. These topics are for non-laboratory study only and are not to be used in conjunction with the operation of any tool or machine described herein. Never use a machine tool without the supervision of a qualified instructor.
To cut a thread of 1-8 UNC-2A on the shaft of the preceding problem.

What is the diameter to turn on the shaft?

Turn to a table of the Unified Screw Threads chapter and look for the thread designation.

The major diameter of the thread must be between .998 and .983

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label: machiney's Handbook., blueprint, steel properties, speed and feeds, threads, measuremennt, over wires, press fits, slip fits