在仪表制造业中,有些零件的孔深要求很严,由于零件的孔径较小,游标卡尺的测深杆无法进入孔内测量,故常借助于由工具部门制造的深度规来进行间接测量。由于制造深度规需要较长的周期,且又提高了产品的制造成本和使产品不能及早投放市场。这种情况在试生产和小批量生产中更为突出。我厂在过去的生产中已经使用如图所示的测量工具来对小孔深度进行测量。它是在通用 In the instrumentation industry, some parts have tight hole depth requirements. Indirect measurements are often made using depth gauges made by the tool department due to the small diameter of the part and the fact that the Vernier calipers can not enter the hole. Due to the need for longer manufacturing depth gauge cycle, but also increased the manufacturing cost of the product and the product can not be put on the market early. This situation is more prominent in the trial production and small batch production. In the past, our factory has used the measuring tools shown in the figure to measure the depth of holes. It is in common use