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To trim the grinding wheel with a diamond pen, the distance between the nib and the surface of the sand is inaccurate, and the device is still in the machine tool attachment. The tool can only be judged by the operator's experience, and slowly turn the knife hand wheel so that the diamond tip is slowly approaching the dressing surface of the wheel. Sometimes due to vibration or uneven force on the arm, a little more, the tip of the pen will puncture a groove on the trim surface, and the sand will splash and easily hurt the operator's face and eyes. The tool can only be trimmed one end at a time, and the other end is changed in the same way. Sand after finishing