Using the Three-Wire Method to Measure Threads
Dee Thread Measuring Wires.) 2. Subtract the constant from the measured value. Here’s the formula: E is the pitch diameter you are trying to find M is the measurement you took Const is the Constant value from the chart. E = M – Const The photo above is measuring a piece of ½"–13 threaded rod. The micrometer reads 0.5112". So the formula is:
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