Cant create a simple circle with same with and hight

[PanZer (PanZer Kell)]

Hi im new to 3D Laser and light burn.
I recently got a 6550 engraving machine handed over from a friend.
controller is CAMXTOOL 2AXIS V1.0 + a 40W China led laser.
When engraving pictures / bitmaps there’s no problem but when doing vector or just simple circle objects inside lightburn all circles gets uneven. (see picture)
I have checked belts and cleaned the synchronizing wheels.
I have tried different laser type setups.
I have calibrated the axis.
(Nb: Rotery is disabled)

Any advice on this issue ?

Best Regards
PanZer

[misken (Melvin)]

This looks definitely mechanical. Go through these steps to check everything: Guide to mechanical adjustments and maintenance It’s not only the belts and wheels, there are many more parts to check.
You configured your axis to have different steps/mm, so I guess you already tried calibrating them? How did you do that?

[PanZer (PanZer Kell)]

Hi i made a square 500 x 500 measured it and added the difference under calibrate axis. First brun was 500 x 480, after calibration 500 x 500.

Worth mentioning is the error occurs in all work area.

Thanks in advance.

[PanZer (PanZer Kell)]

I will check this from the guide:
Often instabilities come from wrong parameters in the firmware. I recommend adjusting the following values (see the page about firmware on how to change parameters). Especially, the acceleration should be adjusted as shown here!

[PanZer (PanZer Kell)]

Hi it was mechanical, one belt was not centered in on the step gear.
Thanks for you advice.

BR
PanZer