For cnc machining centers using semi-closed-loop servo system, the existence of backlash will affect the positioning accuracy and repeatability of the machine tool, resulting in unstable machining accuracy, resulting in machining parts that are not round enough, not square enough, and there is always a contour error .
1. Carry out mechanical adjustment first, first tighten the screw lock nut, whether it is because the screw shaft end coupling locking taper sleeve is loose or the coupling is damaged, and the contact dyeing points of each guide rail and the plastic surface are uneven , Re-match the shovel with precision, so that the contact surface dyeing point is more than 80%, and the 0.02mm feeler gauge is not qualified.
2. Check that the pre-tightening force of the screw nut is too strong or too loose. Adjust the preload and check the axial rotation value so that the error is not greater than 0.005mm.
3. Check that the end face of the screw nut is not perpendicular to the joint surface, the joint is too loose, repair and adjust and repair, and the pre-tightening force of the screw bearing seat is too tight or too loose. Adjust and repair it.
4. The ball screw has large manufacturing error or axial movement. The automatic compensation of the control system can also eliminate the gap. Use the instrument to measure and adjust the screw movement. The lubricating oil is insufficient or the lubricating oil of each guide rail surface is not adjusted.
Looking forward to your consultation if you have any other questions