Tab holes “drifting” 10 Watt vrs 22 Watt diode Laser

Using a Creality 10 Watt and a Creality 22 Watt Diode laser. LB 1.7.06 (3mm MDF)

Kerf settings Tabs 0.055 and the tab holes -0.055. These settings always works on the 10 Watt having a tight fit everywhere. I have calibrated the 10 watt at 200mm x 200mm and it measured 100%

I designed a toy caravan using LB 1.7.06. When I cut the outer shell of the toy, then all pieces fits together perfectly. When I add the windows and inside tabs, the parts do not fit together anymore. The tab holes spacing seems to “drift” apart. I have changed the orientation of the cut, and the problem was the same.

I then changed the design method, having the outer shell only and “Lock the selected shape”. I design the windows and the wording outside the frame of the shell, and then “Lock the selected shape.”

I then cut and past the shell to the cut area and lock it. The same with the windows and the wording, and placed it where it should be. When I cut on the 10 watt. The pieces still would not fit.

I change the output to the 22 watt laser. Kerf 0.12 and tab holes kerf @ 0.0 (off). Everything fits 100%. No tab holes “drifting”.

Am I smoking my socks? What else can I do except throwing stones at my own shade…

How did you calibrate your steps/mm? I guess you cut a piece and measured the size of the piece compared to how you designed it? That could be the issue here. You can ONLY calibrate the distances by engraving a shape and measuring from center to center of the lines. Otherwise, you introduce a scaling effect that changes over distance.
Check the end of this article: Guide to mechanical adjustments and maintenance I tried to explain it there. Here is a short version:

Thanks a mill !!! I will try this in tomorrow. Very anxious to try this and see what the outcome would be. Again thanks…

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