From the lathe processing process, the drag and control of the medium car bed has the following requirements:
1. In order to ensure economic and reliable, the main drag motor generally choose cage-type asynchronous motor. In order to meet the requirements of the speed range, the general use of mechanical variable speed.
2. The start-up and stop of the spindle motor should be automatically controlled. Generally small and medium-sized lathes are direct started, when the motor capacity is large, commonly used YY-triangular buck start, in order to achieve rapid parking, generally using mechanical or electrical braking.
3. For turning threads, the spindle is required to be positive and reversed. Small lathe spindle is positive, reverses the main drag motor positive, reverse to achieve, when the main drag motor capacity is large, the spindle is positive, reverse commonly used electromagnetic friction clutch to achieve.
4. For tools and workpieces for cooling turning, a cooling pump should be provided. The cooling pump only needs to rotate in one direction and is interlocking with the spindle motor.
5. The control circuit shall be equipped with the necessary safety protection and safe and reliable local lighting.