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测量螺纹中径一般采用三针测量法,因此正确选择三针直径很重要。锯齿形螺纹由于螺纹型面不对称,所以,正确选择三针直径尤为重要。如果三针直径放置在螺纹沟槽中,与螺纹牙形角的两边接触,其切点恰好在螺纹中径上,那么,该三针直径称为最佳三针直径。用最佳三针直径测量螺纹中径时,牙形角误差对测量结果无影响。对于锯齿形
Measuring thread diameter is generally used three-pin measurement method, so the correct choice of three-pin diameter is very important. Serrated thread As the thread profile asymmetric, so the correct choice of three-pin diameter is particularly important. If the three-pin diameter is placed in the thread groove and comes into contact with both sides of the thread angle, the point of tangency is exactly on the middle diameter of the thread, then the three-needle diameter is called the best three-needle diameter. With the best three-needle diameter measurement thread diameter, the tooth angle error has no effect on the measurement results. For serrated