hello I’m using an Algolaser 40w diode laser and 1.7.08 of LB.
when I try to laser circle or rectangulars or texts I have some problems with the dimensions. there are some photos here. I don’t know what to do with that.
as you see my rectangles are not closed from the right-bottom.
circles are like ellipses, texts are disaster.
normally there is no space between the rectangles on the lbrn file but there are spaces on output.
problematic.lbrn2 (64.6 KB)
thanks
This is almost certainly a mechanical problem. There are many such topics on this forum so a search will get you many results.
In short, do a full mechanical review paying particular attention to grub screw retention on pinion gears and belt tension. Based on your photos I’d say it’s most likely you have a loose pinion gear on the Y-axis.
hello again, I’ve check the subject about what you said on the forum. I made some important changes on belts. but there is only one problem now : when I make a rectangle x:30 y:30mm, the result is x:30 y:29mm. so circles and rectangles have kind of weird looking. what can I do now?
Can you provide an example photo? There are potentially several reasons for dimension accuracy issues. You may still have a mechanical issue, possibly overtight belts. Are you certain that you’ve solved the issue of unclosed circles? I would suspect you’re still losing motion on the Y-axis and haven’t eliminated all backlash.
If you have sorted out all mechanical issues then you may have an issue with axis calibration. I don’t see this as likely given the amount of drift and since most modern machines come fairly well calibrated from factory… at least not likely to have a 3% miscalibration.
If this does end up being a calibration issue you can resolve this through LightBurn using Edit->Machine Settings->Axis Calibration.
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