Thread profile measuring method

摘要

A method includes: performing a scanning measurement of a female thread along first and second axes extending along a center axis of the thread and opposed to each other across the center axis; determining characteristic values of the thread from contour data of the thread obtained through the measurement; obtaining the contour data including first contour data associated with the first axis and second contour data associated with the second axis by performing the measurement; detecting a thread displacement along the center axis between a crest associated with the first axis and a crest associated with the second axis at each of first position and second position on the center axis; calculating inclination and deviation of the first and second axes from the thread displacements detected at the first and second positions; and adjusting an attitude of the thread for the measurement to eliminate the inclination and deviation.

主权项

1. A thread profile measuring method comprising:
scanning a thread along a first axis and a second axis extending along a center axis of the thread to obtain contour data of the thread, the first axis and second axis being opposed to each other across the center axis; detecting a first distance of thread displacement along the center axis between a thread crest on the first axis and a thread root on the second axis at a first position on the center axis; detecting a second distance of thread displacement along the center axis between a thread crest on the first axis and a thread root on the second axis at a second position on the center axis; calculating an inclination and a deviation of the first axis and the second axis from the first distance of thread displacement detected at the first position and the second distance of thread displacement detected at the second position; and adjusting an attitude of the thread to eliminate the inclination and the deviation.