What are the characteristics of linear motion repetitive positioning accuracy in precision parts processing

In precision parts processing, the positioning accuracy of CNC lathes is the measurement of the positional accuracy that the moving parts of the machine tool can achieve under the control of the CNC system. Based on the measured positioning accuracy values of a CNC lathe, the best machining accuracy that the workpiece can achieve on the machine can be determined.

The main detection content of positioning accuracy includes: linear motion positioning accuracy, linear motion repetitive positioning accuracy, etc. Today, we need to understand the linear motion repetitive positioning accuracy.
This accuracy is the basic indicator reflecting the stability of coordinate axis motion, and the stability of machine tool motion determines the quality stability and error consistency of precision parts processing.

The general inspection method is to measure at any three positions near the midpoint and both ends of each coordinate stroke. Each position is quickly moved for positioning, and the positioning is repeated 7 times under the same situation. The coordinate value of the positioning point is measured, and the maximum difference in reading is calculated. Take 2/1 of the maximum difference in the three positions and take the ± sign as the repeated positioning accuracy of the coordinate.