The preparation work that needs to be done for the pipe thread lathe before operation mainly includes the following:

1. Check whether the operating handle, switch, knob are in the correct position, whether the operation is flexible, and whether the limit and safety devices are complete and reliable.

2. Connect the power supply and run the vehicle at low speed without load. If there are any abnormalities, stop the machine for inspection or report to the repair personnel.

3. Check if the liquid level indication in the oil gauge is appropriate, if the oil circuit is unobstructed, and add sufficient lubricating oil at the designated location.

4. Run the low-speed empty vehicle for 3-5 minutes, and only start working after confirming that the lubrication, electrical system, and various parts are functioning properly.