What guarantees the machining accuracy of machine tools?

1. Full closed loop control feed servo system

The position detection device (such as grating ruler, linear induction synchronizer, etc.) is installed on the moving parts of the machine tool (such as the workbench), and the position of the moving parts is fed back in real time. After being processed by the CNC system, the state of the machine tool is informed to the servo motor, and the servo motor automatically compensates the motion error through the system command. But because it puts the big inertia links such as lead screw, nut pair and machine tool table in the closed loop, it is difficult to debug the stable state of the system. In addition, such measuring devices as grating ruler and linear inductosyn are expensive and complex to install, which may cause oscillation, so the general machine tool does not use full closed-loop control.

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