一、问题的提出自一九七七年以来,我厂某位置指示器因电位器组件与电刷之间摩擦大而影响装配的问题越来越严重,每批少则几件、十几件,多则一半左右。如:一九八○年三月份装配的一批产品,200件就有115件不好,高达57％。为此,曾作了大量的工作,如:复测电刷的硬度、接触压力;检查电位器工作表面质量及操作工艺等均符合产品图纸或工艺资料的要求; First, the problem raised Since 1977, I plant a position indicator due to friction between the potentiometer components and brushes and affect the assembly of the more serious problems, each batch of as few as a few, a dozen , As many as about half. Such as: a batch of products assembled in March 1980, there are 115 cases of 200 is not good, up to 57%. To this end, has made a lot of work, such as: the hardness of the re-test brush, contact pressure; check the potentiometer work surface quality and operating processes are in line with product drawings or process data requirements;