Why can't the stone cutting machine cut straight?

The reason why the cutting is not straight: too much force, the straight line is not straight.
The correct cutting process is as follows:
1. First pull down the angle wrench of the stone cutting machine.
2. Adjust the cutting angle of the stone cutting machine according to the thickness of the stone to be cut.
3. Then turn back the wrench of the stone cutting machine and buckle firmly.
4. When cutting, please place the part to be cut in the air and fix it.
5. Wear gloves with both hands and carry the stone cutting machine for cutting. Be steady and don't cut crookedly.