Measurement of Screw Threads Parameters using Two-Wire or Three-Wire Methods
Angle of thread (α), in metric thread is:
The value of the (T) dimension underwire, can be calculated using the expression
The expression (E) of effective diameter using three-wire method:
How are the wires arranged in the three-wire method?
Determine the pitch of screw if distance across 10 threads measured using scale is 15 mm.