1. Improper selection of saw blades, such as coarse teeth when sawing thin plates and pipes.
2. The sawing angle is too large when sawing.
3. The sawing movement suddenly swings too much and the sawtooth has too violent impact.
4. When a few teeth of the saw blade are broken, they should be trimmed even on the grinder, that is, the adjacent 2-3 teeth will be ground down into a concave arc. And polish the broken teeth. If not dealt with immediately, the teeth behind the cracked teeth will crack one after another.