1. The two-edged milling cutter is a keyway milling cutter. The keyway milling cutter is named after the keyway milling cutter. It is a fixed-size prop. If it enters the tool directly, it will be held up by the center hole and break Knife accident. Instead, the knife can only be entered from the side, or while the knife is moving, the knife can be entered.
2. The three-flute milling cutter is an ordinary end mill, and the outer diameter of the milling cutter does not have the same precision requirements as the keyway milling cutter.