本文介绍利用在立式测长仪上一顶针支架和一单针(圆柱)来测量中径的方法。如果没有立式测长仪也可以把顶针支架放在零级平板上,用其他量仪测出M值再算出丝锥中径d_2。现将用立式测长仪测量奇数槽中径d_2的计算方法简介如下: 将装有平面测帽的立式测长仪与带筋的方工作台接触并对好零位。然后把顶针架1放在仪器工作台6上,并把被测丝锥3(如图1)用小顶针2顶住 This article describes the use of a vertical length measuring instrument on a needle holder and a single needle (cylindrical) to measure the diameter of the method. If there is no vertical measuring instrument can also be thimble bracket on the zero level plate, with other measuring instrument measured M value and then calculate the tap diameter d_2. Now use vertical length measuring instrument to measure the odd groove diameter d_2 calculation method is as follows: Will be equipped with a vertical measuring cap vertical measuring instrument with the square side of the workbench with a rib contact and a good zero. Then the thimble holder 1 on the instrument table 6, and the measured tap 3 (Figure 1) with small thimble 2 to withstand