圆形工件径向通孔的对称度,在批量生产的产品中应予控制和检测,例如柴油机喷油泵柱塞偶件的柱塞套,当进回油孔是同轴线时,即应检测其对称度,但在测量时通常十分不方便。这里介绍一种用废旧外径千分尺改制为对称度检具,检测柱塞套进回油孔的方法,使用此方法十分方便。 Circular workpiece radial through-hole symmetry, should be controlled and tested in mass production of products, such as the diesel engine plunger plug plunger sleeve, when the oil return hole is coaxial, it should be detected Its symmetry, but in the measurement is usually very inconvenient. Introduced here with a discarded micrometer micrometer restructuring for the symmetry of seizure, detection of the plunger sleeve back into the hole method, the use of this method is very convenient.