群钻是我国工人阶级创造的先进刀具,它具有切削轻快、耐用、精度高等优点。但由于它钻形复杂,有三尖七刃,所以刃磨比较困难,影响了它的推广与使用。为了解决这个问题,我们在JMW-81A型万能刃磨夹具的基础上,研制了一套附件,与刃磨夹具配套使用,成功地解决了群钻的刃磨问题。 Group drilling is an advanced tool created by the working class in our country. It has the advantages of cutting light, durable and high precision. However, due to its complicated drilling shape, there are three sharp seven blade, so sharpening more difficult, affecting its promotion and use. In order to solve this problem, we developed a set of accessories based on the JMW-81A universal sharpening jig and used it in combination with the sharpening jig to successfully solve the problem of sharpening the group drills.