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Reasons and solutions for dimensional instability caused by CNC lathe driver and machinery

Reasons and solutions for dimension instability caused by CNC lathe driver:

Cause Of Issue

  • ①The signal sent by the driver is lost, causing the driver to lose synchronization
  • ②Due to signal interference caused by the driver, it is out of sync
  • ③ Improper parameter setting of the servo drive and unreasonable gain coefficient setting
  • ④ The drive is in a high-temperature environment, and no good heat dissipation measures have been taken, resulting in unstable dimensions, and may also cause changes in the internal parameters of the drive, causing malfunctions
  • ⑤ The drive current of the driver is not enough
  • ⑥The driver torque is not enough or the motor torque is not enough
  • ⑦ The driver is damaged

Solution:

  • 1. First determine whether you are using a stepper drive or a servo drive: the stepper motor drive can determine whether there is a step out through the phase light or dial indicator. The servo drive can be judged by the pulse number display on the drive or playing a dial indicator
  • 2. Ensure a good heat dissipation and ventilation environment, the appropriate temperature is an important factor to ensure processing performance
  • 3. Refer to the DA98 manual to modify the gain parameters
  • 4. Install shielded wire and anti-interference capacitor
  • 5. Replace the drive or motor to make the torque meet the actual needs
  • 6. Drive to factory for repair
  • 7. If the drive current is not adjusted enough to meet the requirements, the driver needs to be replaced

CNC lathe machinery caused by unstable machining dimensions

Cause Of Issue

  • ①The size of the processed workpiece is improperly clamped
  • ②The water in the motor plug causes the insulation performance to drop and the motor to be damaged
  • ③Whether the stepping motor damping sheet is too tight or too loose
  • ④Workpiece appears ellipse
  • ⑤ The reverse clearance of the screw is too large
  • ⑥The mechanical screw is installed too tightly

Solution:

  • 1. Adjust the damping disc so that the motor is in a non-resonant state
  • 2. Check the runout of the spindle, repair the spindle, replace the bearing
  • 3. Check whether the feed amount is too large or overload caused by too fast, check the workpiece clamping should not extend too long the chuck, to avoid letting the knife
  • 4. Replace the motor plug for protection, or replace the motor
  • 5. Check the reverse clearance of the screw by playing a dial indicator, whether the clearance has been filled in from the system, and whether the clearance is too large after filling in
  • 6. Check whether the screw is crawling and whether there is a slow response

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