Different precision requirements:

1. The size of keyway milled by the two edge milling cutter can reach high accuracy, and the end face of the keyway milling cutter does not have a central hole, so it can directly feed down, instead of the common three edge milling cutter, which cannot directly feed down because of the central central hole.

2. The end mill with three edge milling cutter can not achieve the precision of keyway milling cutter. When the two milling cutters are milling, there is no difference in the three elements of milling.

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