I’m trying to engrave text and I’ve found a few times that the laser appears to engrave text 2-times about 2mm apart, even though it only passes once. I’ve adjusted the laser to a point, so I believe it’s focused correctly.
What are ways to fix? I’d tried adjusting from fill to line. I’ve tried masking tape to reduce burn. I’ve adjusted the power. It’s still appears to be off. Any help is appreciated.
It’s one pass and a single job. Which is the weird part. First attempt I did have 2 passes (carryover from previous job). But I changed that and am still getting this result.
Speeds? I assume being leather its quite fast
Try this on scrap cardboard
Run job as is once (even with 2 passes)
then cut speed and power in half
Run again
If the 2nd job ran perfectly it means the X belt needs tightening and at high speeds its losing steps
Definitly something off on your X belt
I would review all but if you can, run that test again (even at 1% power) at 3000mm/min and record on video upclose the belts. as they move i can see if they are loose or not. both X Y left and Y right
If they are flapping about inside the rail they need tightening
Thank you. Just uploaded the video (about 3 minutes long) and tried different angles of the belts. Let me know if you need a different one. The safety goggles made it hard to make sure I was capturing the best angles
That’s not burning two passes, it’s the ‘return pass’ being misaligned with the outgoing pass because the belt is either loose (most likely) or too tight (less likely, but can also cause this).
Thank you, everyone! The x was too loose. I didn’t get it to 100% perfect, but I was able to get about 99%. I appreciate everyone’s willingness to weigh in.
From the video you sent all belts need tighetning
Specialy X + Y right side (cant see well the belt on left side)
In this case the problem gets more notorious on the X because the lateral left/side motion
As the laser head reaches the end of the line → slows down _> stops > reverses
The steppers pull to start moving the other direction but as the belt is loose those 0.5mm of initial motion simply are used to apply tension to the belt, THEN the motion starts. So you get 0.5mm each side of “slack”
You need to tighten them all nicely
Now Tight is a very subjective term but when you look at the belt on rest (no motion) in the vslot they should be in tension and not drooping into the slot
Made this very crude referece just so you can see how tight they should be. Again very hard to put in words even on video but if you press them near the sprockets they should not move more than a few mms