Cut off: 1. Choose a tool When cutting pipes, workpieces, and bars, the reduction of cutting force and the saving of materials are very important. Therefore, the insert should be as narrow as possible, and the groove shape can make the cutting narrower than the groove. In this way, good cutting control and surface finish can be obtained. 2. How to apply The blade should be as narrow as possible. This can help save materials and reduce cutting force, and also reduce environmental pollution. If possible, avoid cutting to the center. Reduce the feed rate by 75% before cutting to 2mm from the center of the workpiece, so that the tool life can be longer. The cutting process is stopped about 1mm before approaching the center of the workpiece, and the part will fall due to its own weight and length.