Reason:
1. The strength of the knife is not enough, too long or too small. Causes the tool to snap.
2. Improper operation by the operator.
3. The cutting allowance is not uniform. (for example, 0.5 is reserved for the side surface and 0.15 is reserved for the bottom surface)
4. Improper cutting parameters (such as too large tolerance, too fast SF setting, etc.).
Improvement:
1. Principle of using knife: it can be big but not small, short but not long.
2. Add the angle clearing procedure, and the margin shall be kept as uniform as possible (the margin of the side and the bottom shall be the same).
3. Reasonably adjust the cutting parameters and round the corner with large allowance.
4. Using the SF function of the machine tool, the operator can fine tune the speed to achieve a good cutting effect.
