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What factors will lead to instability of CNC machining dimensions?

2022-10-17

1. The connection between the servo motor shaft and the lead screw is loose, causing the lead screw and the motor to be out of sync, resulting in dimensional error. During detection, it is only necessary to make marks on the coupling between the servo motor and the lead screw, and move the workbench (or tool rest) back and forth with a faster magnification. Due to the inertial action of the workbench (or turret), the two ends of the coupling will move relatively obviously. This kind of fault usually shows that the machining size only changes in one direction, and it can be eliminated by uniformly tightening the coupling screws

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2. The lubrication between the ball screw and the nut is poor, which increases the movement resistance of the workbench (or tool rest) and makes it impossible to completely and accurately execute the movement command. This kind of fault usually shows that the size of the part changes irregularly within the range of several wires, and the fault can be eliminated by improving the lubrication.

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3. The moving resistance of the machine tool workbench (or tool rest) is too large, which is generally caused by the tight adjustment of the inserts and poor lubrication of the machine tool guide rail surface. This fault phenomenon generally shows that the part size changes irregularly within the range of several wires. The inspection can be carried out by observing the size and change of the position deviation of DGN800-804. Generally, the difference is large when the positive and negative directions are stationary. This kind of fault only needs to readjust the insert and improve the lubrication of the guide rail.

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4. The rolling bearing is worn or adjusted improperly, resulting in excessive movement resistance. This fault phenomenon also usually shows that the size changes irregularly within a few wires. The inspection can be conducted through the position deviation of DGN800-804, and the method is the same as above. Such faults can be eliminated by replacing and carefully adjusting the worn bearing.

Shenzhen Perfect Precision Product Co., Ltd.

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What factors will lead to instability of CNC machining dimensions?

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