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用三针测量螺纹时,是假设一个无限薄的元片,在轴向面与牙型对称地接触,实际应用的三针改变了这一假设,使三针与牙型之接触在顺螺纹线的法向方向,接触位置亦有改变,这就是要考虑螺纹升角引起测量误差的原因。这个误差在测量计算中的关系如下:
The three-pin measurement of the thread assumes an infinitely thin piece that comes into symmetrical contact with the tooth profile in the axial plane. The three pins actually used change this assumption so that the contact of the three pins with the tooth profile The normal direction, the contact position has changed, which is to consider the cause of measurement error caused by the thread angle. This error in the measurement of the relationship as follows: