The end mill is used to process the plane or cylindrical surface, so its outer diameter is relatively loose, while the keyway milling cutter is used to process the keyway. Its outer diameter directly affects the quality of the keyway and the key, so the tolerance Strict; there are keyway milling cutters with only two margins in order to machine holes, and end mills with more than two margins.
The end face of the end mill has a central hole, while the end face of the keyway milling cutter has no central hole. Therefore, the end mill cannot be fed directly downward, and the deeper it is, the center hole will withstand. The keyway milling cutter can feed directly downwards.

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