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RE: pitch diameter

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From memory. A thread is considered a cantilever beam, with a point load applied at the middle of the span, and the section properties taken at the middle of the span. Pitch diameter is midway between the major diameter and the minor diameter. Check Marks Handbook of mechanical engineering, or the machinery’s handbook, mechanical engineering design by Shigley, or schaums outline series on machine design.


Conrad Harrison

B.Tech (mfg & mech), MIIE, gradTIEAust



South Australia