Inverting skill of hand mill grinding punch needle

1. preparation: prepare hand mill, grinding wheel and needle.

2. Angle adjustment: Insert the needle into the jaw and fix it. Adjust the angle between the needle tip and the grinding wheel as needed to minimize the contact area between them.

3. Height adjustment: adjust the height of the grinding wheel upward or downward, so that the contact position between the grinding wheel and the needle is just at the highest point of the needle.

4. Adjust the grinding wheel: After a period of time, the grinding wheel will wear out, so it is necessary to adjust the position of the grinding wheel until the grinder is completed.