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KA-2M-300型钻机上的卷扬偏心轴承，是一个容易磨损的零件。各钻探队都需要备用一些，以防检修时临时制作耽误时间。因此它是各钻探队的修配部门经常生产的钻机备件之一。我厂以前车制此零件的偏心孔时，是把轴承外径及端面长短车好后，划上偏心线，放在V形铁上用四爪卡盘，按线找正后，卡牢车制。这样找正很费时间，效率低质量也不够好。在技术革命运动中，我厂车工蔡盛富同志改进了一个卡具，使用这个卡具能省去找正时间，又能省掉一道划偏心线的工序，提高了效率，又保证了质量。现将此卡具介绍如下：
The hoisting eccentric bearing on the KA-2M-300 drilling rig is an easily worn part. All drilling teams need to be spared to prevent temporary delays during maintenance. It is therefore one of the rig spare parts often produced by the repair department of each drilling team. Our factory used to make eccentric holes for this part of the car. After the bearing OD and the length of the end face were good, they were marked with an eccentric line and placed on a V-shaped iron with a four-jaw chuck. After the alignment, the car was stuck. system. It is time-consuming, inefficient and of poor quality. In the technological revolutionary movement, Comrade CAI Sheng-fu of our factory has improved a fixture. Using this fixture can save time for correcting, and it can save a process of drawing an eccentric line, improving efficiency and ensuring quality. This card is introduced as follows: