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Threading Wires | Model Engineer

https://www.threadcheck.com/the-three-wire-method-of-measuring-pitch-diameter/technicalinfo/ https://everbright.com.tw/userdir/56_c.pdf (metric wires for Whitworth form threads) https://dx.doi.org/10.6028/nbs.lcirc.23r1923 (old, but comprehensive) The very best source on this is an old Van Keuren catalogue, but you have to buy a paper copy as none are online yet. For specific thread measurements, drill blanks (available from the likes of Zoro Tools) make serviceable measuring wires. If you did ...
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