1. The installation of the saw blade on the hacksaw machine must be tightened, and the workpiece must be securely clamped and placed horizontally and perpendicular to the saw blade. 2. The vise should be installed so that the center of the saw material is in the middle of the saw bow stroke. When cutting at an angle or square material, it must be tightened after rotating the vise. 3. Before starting work, check whether the hydraulic device is working properly at all positions of the gate valve handle. When the car is empty, the control handle should be placed in the "stationary" or "open" position. When cutting, place the handle in the feed position to slowly lower the saw blade and make contact with the workpiece. Then switch to "slow feed". Wait until the work is confirmed to be normal before turning to the required feed rate. 4. The coolant must be sufficient and clean. 5. It is strictly prohibited to change the speed during the operation of the machine tool, and the saw blade must not be stopped before it is lifted. After work, place the handle in a non working position and cut off the power.