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大直径内螺纹的直接测量,目前还是个难题。我们以前对大规格螺纹零件加工都采用互配及大螺纹塞规等方法,给生产带来困难,迫切需要简便轻巧的内螺纹量具。故而我们克服重重困难,自制了一架M115～630大直径内螺纹千分尺,目前已正式使用到产品中去,收效很好。一、结构型式:它是由两部分组成。一是75～575内径千分尺;二是四组公制螺纹测头。
Direct measurement of large diameter internal thread, is still a problem. In the past, we used the method of interworking and large thread plugs to process the large-size thread parts, which brought difficulties to the production and urgently needed the handy and light internal thread gauge. Therefore, we overcome numerous difficulties and made a M115 ~ 630 large-diameter internal thread micrometer, which has been officially used in the products and has achieved good results. First, the structure type: It is composed of two parts. First, 75 ~ 575 diameter micrometer; Second, four sets of metric thread probe.