C620车床上的脱落蜗杆是四头蜗杆。为了保证蜗杆的准确分度,决定在X62W万能铣床上加工。但通常铣削而成的蜗杆,在顺铣的一面光洁度高;而逆铣的一面光洁度低。实践证明,假如两面都作顺铣,光洁度都一样了。为此,采取了如下方法:一、自制30°指形角度铣刀,刀子的中径应比蜗杆法向内齿厚约小0.20～0.30毫米; The shedding worm on the C620 lathe is a four-headed worm. In order to ensure the accurate indexing worm, decided to X62W universal milling machine processing. However, the worm, which is usually milled, has a high degree of smoothness on one side of the down-milling and a low degree of finish on the side of the down-milling. Practice has proved that if both sides for milling, finish are the same. To this end, the following methods were adopted: First, the self-made 30 ° finger angle milling cutter, the diameter of the knife should be smaller than the worm tooth thickness about 0.20 ~ 0.30 mm;