Three-Wire Thread Measurement
Three-wire measurement over a 60-degree thread: best wire W = 0.57735 x pitch, acceptable wire range, and measurement over three wires M = E + 3W - 1.51553 x pitch from the user-supplied pitch diameter (first-principles thread geometry).
Formula and source
Best wire W = P / (2 cos30) = 0.57735 x P (range 0.560P to 0.650P); measurement over three wires M = E + 3W - 1.51553 x P for a 60-degree thread.
The three-wire measurement-over-wires method for 60-degree threads and the best-wire / 1.51553 constant - first-principles geometry as in Machinery's Handbook (Industrial Press), by name; public domain.
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