I’m going to guess belt slippage. (backlash) If it “jumps a tooth” when it switches directions at the end of a pass, this is probably what it is going to look like. You’re scanning, right? What are your speeds?
I wish I better understood the “System Settings/Scanning Reverse Interval” settings. (page 38 of the ThunderLaser user manual) Perhaps someone who can translate Chinese could read the Chinese version of the manual and do a better translation for us?)
I’m just guessing here, but it feels like this is where slowing the speed at which the laser head “changes directions” at the end of a pass would help here. Slowing down the rate at which it makes that switch should help keep the belt from slipping if that’s really the issue.
There is NO setting here on our current RDWorks config, but RDWorks on my computer has these settings:
Here’s the manual’s version of English:
Laser scanning graphic way, because the relationship between the machine belt tension may cause the edge of the scanned graphics uneven. Therefore, increasing backlash to fix. It has the specific backlash for the certain speed. General, the greater the speed, the greater the backlash.
I think they’re trying to say: Scan speeds that are too fast can cause backlash and uneven edges. Using reverse interval can fix that. More reverse interval is needed for even faster scanning speeds.
Try adding a “scanning reverse interval” setting at the speed you’re doing your scanning and see if that helps. .3mm for 700mm/sec scan speed sure doesn’t seem like much, but maybe that’s all it needs.
If you’re seeing this during cutting at slower speeds, I’m way off.