The transmission mechanism of precision machining: it is composed of some gear shafts and gear pieces, and the torque of the prime mover is driven to the escapement speed regulating mechanism, which drives the pointer displacement and rotation. By using the escapement action of the escapement gear tooth and fork, the spring torque is transmitted to the speed regulating assembly, and the spring torque is relaxed at the same speed. Hand chain and automatic winding watch two kinds.

The power source of these two machines is powered by the spring in the movement, driving the gear and then pushing the watch hand, but the way of power source is different. The mechanical watch on the hand is manually refined, and the thickness of the movement is thinner than that of the general automatic watch, and the relative weight of the whole watch is lighter. A process in which the external dimensions or properties of a workpiece are changed with a machining machine.

According to the temperature state of the workpiece to be processed, it is divided into cold processing and hot processing. Cold processing is generally processed at room temperature, and does not cause chemical or phase changes in the workpiece, called cold processing. Cold processing can be divided into cutting processing and pressure processing according to the difference in processing methods. Under the action of the conveying device, the workpiece to be machined passes through each processing equipment according to its process sequence.

All processing tasks, such a production line is called a machining production line. Machine processing production line distribution line and automatic line. Automatic line is on the basis of the assembly line, the use of control system, the workpiece conveying between each machine tool, transposition, and clamping and auxiliary device action are realized automatic control, and according to the pre-designed program automatic work of the production line.