Hello laser enthusiasts,
I regularly use a FabKit Mk6 we bought last year at work (at a French scientific public institute).
It took us few months to assemble and have it work reliably because we did not had much time to work on it at first.
The last thing we had to adjust was a loose pulley on the Y-axis motor and then it worked really great (controlled directly using LightBurn through USB cable) with good match between cutting work and engraving work (using the presets found on this precious forum).
Since last week, I noticed deviation along the engraving areas showing as an inconsistency in X coordinates as shown in the following image:
On this photo you can see one path and an half engraving on cardboard (engraving at 400mm/s starting at the bottom of the area with a height roughly of 5cm).
The two passes aren’t overlapping as the first one was slopped (curved) but the second (stopped on purpose) was correct.
On the following image I added coloured lines to help explain the problem:
Colour line description:
- blue: horizontal reference
- red: slopped first pass
- green: vertical (and correctly positioned) second pass
The first horizontal engraved line pass seems to start 2mm right of what it should have been and with each new horizontal engraved lines, this offset seems to fade.
The problem is the same at the other side of the engraved area with the first engraved lines finishing 2mm right of the correct position.
The belt tension responsible of the X-axis movements seems to be ok. It is not too strong as if to much screw-turns are applied to adjust it, the 90° bent metal part starts to change its right angled shape.
Is any of you have an idea of what can possibly be the origin of this problem (and maybe how to correct it)?
Thank you.
