Double engraving issue

LightBurn Hardware Compatibility
1

Hello everyone!

I have finished the build my own and I am trying to configure the machine but I am having issues which we assume are being caused by mechanical issues…

The main issue is that it it duplicating everything we engrave.

Here’s an photo attached of what is happening.
Not just happening with text, but with shapes we engrave too.

We used lightburn. Have tried 2 different laptops to

FB_IMG_1603787813097
FB_IMG_1603787813097720×960 69.4 KB
o.

Things we’ve tried so far:
• Software we’ve tried : lightburn and RD WORKDS
• using new power supply
• tried switching the stepper drivers
• checked the belts and they’re perfect (circles are perfect) and all the lengths are precise
• we checked the pulleys ( x asis)
• checked motor cables
• tried to switch to falling edge PWM (even if my driver was raising edge but thought we’d try)
• this was done at low speed (100mm/s) and we won’t even touch offset yet because that’s at high speed…
• checked the MGN carriage and it runs smoothly
• checked ruida settings
• I don’t have this problem when I’m engraving in a single direction. Only happens with bidirectional settings.

• we are using shielded cables to prevent EMI

Any advice??

Thanks in advance.

2

Did you check the scanning offset?

Scanning offset

I say this because I had the same problem when I replaced my original tube and power supply.

3

Assuming it happens at the same time, it looks like your beam is reflecting off the nozzle to make a ghost, like you are not centered in the lens tube and or not parallel in Z.

4

If it’s only happening when you have bidirectional scanning enabled, it’s likely mechanical:

  • Check set screws on belt pinions that attach them to motors
  • Check that any shaft couplings are secure
  • Check that belts are tensioned properly (not too loose OR too tight)
  • Check that bearings are moving smoothly on rails, and there’s no debris

If you’ve gone through all that, and you’re getting large offsets at low speeds, it could very well be a bad power supply - it happens. How large is the offset?

5

Hi Dave, I would say that if it was happening at the same time. it is just not synchronizing the power supply the laser firing with the stepper motor position.

6

Hi Oz,
I have tried everything mechanical wise. The offset is about 0.5mm at 100mm/s and about 2 cm at 300 mm/s (which I consider very big) invested in a good controller and power supply combination.

I think this problem could be fixed by changing the offset parameter in the software. However, this problem is too big for a precision machine.

I will check with my vendor and see what can be done to get this right.

Please let me know if you know how to test the power supply or even the controller.

7

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