在液压元件生产中，加工平面上的“Ｏ”型密封槽时，其直径尺寸一般由刀具外径来保证。而槽深测量通常用带深度的卡尺及深度尺测量．用卡尺测量时，由于垂直度无法保证，并且受工人熟练程度影响、误差大、很难准确，因此经常因“Ｏ”型槽深超差引起液压元件的漏油现象．用深度 In the production of hydraulic components, the “O” type seal groove on the machining plane, its diameter size is generally guaranteed by the tool diameter. The groove depth measurement is usually measured with depth caliper and depth gauge. When measuring with a caliper, due to verticality can not be guaranteed, and by the proficiency of workers, the error is large, it is difficult to accurately, so often because of the “O” type groove depth caused by ultra-poor oil leakage phenomenon. With depth