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螺纹的三针测量法主要用于测量精密螺纹的中径,适用于单件、小批生产的测量。但三针测量值M没有一定的控制范围,实际上只能在得知牙型半角(α/2),螺距(P)、M(测量值)后,计算出中径(d_2),看其是否符合图纸要求。这样,一方面操作者不便控制,另一方面计算极其烦琐(因为如果经测量、计算后判断中径d_2不符合图纸时,经过修磨后,还要实测α/2、P、M,再进行d_2的计算,如此反复)。现行的一般看法认为三针测量值M只是为了得到实际中径,而没有考虑用它来控制α/2、P和d_2。本文针对这个问题,讨论三针测量值的范围和它所能控制的范围。只要测量值
Threaded three-pin measurement is mainly used for measuring the diameter of the precision thread, suitable for single, small batch production measurement. However, the three-needle measuring value M does not have a certain control range. In fact, the median diameter (d_2) can only be calculated after knowing the tooth half angle (α / 2), pitch (P) and M Whether the drawings meet the requirements. In this way, on the one hand, the operator inconvenient control, on the other hand the calculation is extremely cumbersome (because if measured, calculated to determine the diameter d_2 does not meet the drawings, after grinding, but also measured α / 2, P, M, d_2 calculation, so repeated). The current general view holds that the three-needle measurement M is only for obtaining the actual median diameter and does not consider using it to control α / 2, P and d_2. This article addresses this issue by discussing the range of three-pin measurements and the range over which it can be controlled. Just measure the value