The overhead crane in the workshop slowly lifted several tons of machine tools to the predetermined position, and four screw jacks that had already been prepared on the ground were ready in full swing. The installation accuracy of this precision lathe is required to reach 0.05 millimeters, and any slight tilt may affect the subsequent machining accuracy. The screw jack is the core weapon of this "millimeter level battle".

The installer loosened the locking nut on the top of the jack, turned the rocker clockwise, and the screw slowly lifted the machine base under the drive of mechanical force. The pointer of the dial gauge vibrates slightly as the height changes. When the value stabilizes at 0.02 millimeters, the master immediately rotates the handle in reverse to lock the screw. The four support points seem to be endowed with scale perception, gradually adjusting the machine tool to horizontal through repeated fine-tuning.

Compared with hydraulic equipment, the mechanical self-locking characteristics of screw jacks are fully advantageous at this moment. Even under heavy pressure, as long as the locking device is in place, the height will not experience any settlement. This "rock solid" characteristic allows the installation team to calmly measure the parallelism of the guide rail, ensuring that each set of data meets the factory standards.

When the last anchor bolt is tightened, the installation team leader uses a level to perform final verification. At the moment when the bubble remained stable, the four screw jacks completed their mission - with millimeter level precision, they established a benchmark for precise operation of this machine tool and laid a solid foundation for subsequent efficient production.