Check X/Y scale and kerf¶
Scale and kerf are different errors. Axis scale changes the centerline distance commanded by motion; kerf compensation offsets the contour to account for removed material. Do not “fix” axis scale by changing kerf.
Make a useful test file¶
Create:
- one large outside square or rectangle with distinct X and Y lengths;
- one or more inside holes/slots;
- engraved or marked axis labels away from measurement edges;
- generous spacing and lead positions that do not damage the measurement faces.
Use dimensions large enough that measuring-tool uncertainty is small relative to the error. Include a known dimension to catch an inch/mm import problem before cutting.
Test sequence¶
- Verify the drawing's displayed dimensions in mLaser.
- Use clean, flat, known material and a stable known-good cut process.
- Disable or record contour compensation so its effect is known.
- Calibrate the head, simulate, frame without emission, and cut one coupon.
- Let the part cool; remove dross only in a way that does not change the reference faces.
- Measure outside X, outside Y, and inside features at multiple positions with a suitable calibrated tool.
- Record commanded size, measured size, direction, and repeatability.
Interpret the pattern¶
| Pattern | Check first |
|---|---|
| Everything is exactly 25.4× wrong | Unit conversion |
| X wrong by a percentage, Y correct | X axis scale/configuration or mechanics |
| Both axes wrong by same percentage | Drawing/import scale before machine calibration |
| Outside too small and holes too large by similar amounts | Kerf/contour side or compensation direction |
| Repeated dimensions scatter | Loose mechanics, backlash, slip, heat distortion, or inconsistent cut quality |
| Error changes with travel direction | Backlash/mechanical or directional cut-quality issue |
Before changing calibration¶
Repeat the coupon and measure again. Check belts/racks/couplings and axis condition using the approved maintenance procedure, and confirm a rotary axis configuration was not left active. Export the original machine parameters. Only change axis calibration using the documented Gweike method and a traceable measurement—not a service-password screenshot or a single rough coupon.
After axis motion is proven, calculate kerf from measured test features and apply the correct inside/outside compensation in the job workflow. Re-cut and document the result.
The owner-community prompt that inspired this guide is preserved at the Gweike M-Series community forum; this method is independently written and has no dependence on an attached forum file.