What are the main geometric accuracy checks for CNC milling machines?

The main geometric accuracy checks for CNC milling machines
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When the machine tool is used for a long time, the accuracy is reduced, and the size of the workpiece has also changed, so we need to check the accuracy of the machine tool, how to check the geometric accuracy of the machine tool? What are the main projects? I will share with you:
1. Parallelism in the X and Y directions: the dial indicator is absorbed in a reliable position, one side of the gauge is flattened, the needle touches the other side of the gauge, shakes the handwheel, and observes the reading of the dial;
2.X and Y plane verticality: Install the dial indicator in a reliable position, one side is flattened, the gauge needle gently touches the other side of the gauge, shake the handwheel, and observe the indicator reading;
3. Circle drawing accuracy: Connect the dial indicator light to the spindle, draw a circle on the plane, and take the reading of each indicator light on the four quadrant points;
4. Vertical degree and left and right direction before and after the column: fix the dial indicator in a reliable position, touch the gauge surface with a needle, shake the handwheel, and observe the dial reading
5. Reverse gap compensation: Install the dial on the top of the workbench, gently touch the needle to the hard surface, shake the handwheel back and forth, and observe the dial reading
These are the main precision test items for CNC milling machines depending on the machine, and you can also refer to international accuracy standards for error ranges