螺纹环规的半角和螺距测定,目前还是一个困难的检定项目。以往的资料只谈到用石膏或伍德合金浇于螺纹环规内,得到模型后,再在工具或万能显微镜上测量螺纹螺距或半角。但是这一办法的最大缺点是手续麻烦,不同类型的螺纹环规都得逐个取得模型才能检查。因此浇铸法实际上只适用于研究性的工作。最近经过研究和实验,得到一种检查螺纹环规的新方法,手续简便,测量也准确。不过只适用于检查螺距,关于半角的检查,还在继续研究中。 Thread ring gauge half-pitch and pitch determination, is still a difficult test items. Previous data only talked about the use of gypsum or Wood alloy poured into the thread ring gauge, get the model, and then measure the thread pitch or half-angle on a tool or a universal microscope. But the biggest drawback of this approach is the inconvenience of the procedure. Different types of thread gauge have to be acquired one by one to check the model. So casting method is only suitable for research work. Recent research and experiments, to get a new method of checking thread ring gauge, the procedure is simple, accurate measurement. But only for checking the pitch, on the half-angle inspection, still continuing to study.