Cutting dimension deviations, deformed circular holes, angles that aren't truly square... When a laser cutting machine experiences a drop in accuracy, many business owners' first reaction is to assume, "The equipment is simply getting old." In reality, most accuracy issues can be resolved—and precision restored—through targeted adjustments and troubleshooting.

After a laser cutting machine has been in operation for an extended period, some fluctuation in accuracy is inevitable. The primary causes for this issue can generally be attributed to the following four factors:

1. Wear and Tear on Mechanical Transmission Components (Most Common)

The rack-and-pinion system, guide rails, and linear sliders serve as the "cornerstones" of precision. The mechanical clearance (backlash) that develops after prolonged, high-load operation can cause the cutting head to wobble or vibrate while in motion. Solution: Inspect and tighten the couplings connecting the helical gears to the motors; clean any debris or contaminants from the guide rails and re-lubricate them.

2. Optical Path Misalignment or Contaminated Lenses

If the laser beam deviates from the optical center or the focusing lens becomes contaminated, the energy distribution within the laser spot will become uneven, resulting in a cutting kerf (cut width) that varies in thickness. Solution: Use alignment paper (or "burn paper") to verify the alignment of the optical path; clean or replace the protective lenses and focusing lenses as needed.

3. Servo Parameter Drift

The aging of electronic components or the accidental alteration of system parameters can cause the servo motors to "lose steps" (miss pulses) or exhibit delayed response times. Solution: Re-calibrate the rigidity parameters of the servo motors; if necessary, contact the manufacturer to restore the original factory-calibrated parameters.

4. Backlash in Lead Screws or Belts

For smaller, high-precision processing machines, excessive backlash in the lead screws or slack in the drive belts can be a major "accuracy killer." Solution: Adjust the pre-tensioning nuts on the lead screws or replace any worn-out drive belts.

Conclusion:

A decline in accuracy does *not* necessarily mean the equipment is ready for the scrap heap. It is recommended that you perform a laser spot test and a circularity cutting test once a month. If your own troubleshooting efforts prove ineffective, please contact the equipment manufacturer immediately to request a professional calibration using a laser interferometer.