Thread Wire Constant Calculator

Formula

The formula to calculate the Thread Wire Constant (C) is:

\[ C = \frac{1}{P} - (D \times 0.86603) \]

Where:

\( C \) is the thread wire constant (inches).
\( P \) is the pitch (threads per inch).
\( D \) is the wire diameter (inches).

What is a Thread Wire Constant?

The thread wire constant is a value used in precision measurement of screw threads. It is derived from the pitch of the thread and the diameter of the measuring wire used in the three-wire measurement method. This constant is critical for ensuring accurate and consistent measurements in machining and quality control processes.

Example Calculation

Consider an example where:

Pitch (P): 20 threads per inch
Wire Diameter (D): 0.05 inches

Using the formula to calculate the Thread Wire Constant:

\[ C = \frac{1}{20} - (0.05 \times 0.86603) = 0.05 - 0.0433 = 0.0067 \text{ inches} \]

This means that the thread wire constant for this example is 0.0067 inches.