The fit between the chuck and nut, first of all, I need to understand the fit between the tool and chuck, whether the cutting method is correct, and the quality of the tool itself are all factors that affect the jumping. On this aspect, I need to pay attention to the cleanliness of the clamp and nut, and there should be no dust. The cutting force should be correct, both too large and too small are not good, and it is also very important to have a small tool extension length. When necessary, attention should also be paid to the speed of the spindle motor. For those with low requirements for spindle speed, such as copper metal, a reasonable spindle speed can be chosen to reduce radial runout