The first is down milling. The rotation direction of the milling cutter and the feed direction of the cutting are the same. When the cutting starts, the milling cutter bites the workpiece and cuts off the last chip.

The second is up-cut milling. The rotation direction of the milling cutter is opposite to the feeding direction of the cutting. The milling cutter must slip on the workpiece for a period before starting to cut, starting with the cutting thickness of zero, and reaching the cutting thickness at the end of the cutting. maximum.

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