Thread measurement methods

(1) thread angle measurement
The thread angle also known as tooth type angle. The angle between the axis perpendicular to the plane of the side of the thread with the thread of the flank angle of the thread flank angle thread angle of the measurement, measurements can be achieved. Threaded approximate contour sampling, the sampling points on both sides of the thread segment-linear least squares fitting.
(2) measuring a distance between
The pitch of a point is defined as the distance between adjacent thread corresponding to the point on the thread. Parallel to the axis of measurement must thread.high pressure hydraulic fittings
③ pitch circle diameter measurement
A diameter line perpendicular to the axis of the distance of the pitch circle diameter, the diameter line is an imaginary line. [4]
Measurement results
Machine vision technology, automatic detection system design thread parameters measurement and standard thread samples thread angle, spacing and diameter parameters were measured. Test results showed that in the thread parameters within a predetermined error range. Reliable and high efficiency characteristics, further investigation, visual inspection, and can be used in the production practice hydraulic valve block