Different cut layers coming out off-centre

[NeilTee (MR N THORNLEY)]

Hi there

So I am cutting a large sheet with about 60 small individual items. The cutting/engraving is divided into 4 layers: one to engrave a pattern, another to engrave a different part of the pattern but with more intensity, then two more for the cutting.

When it cuts, the cut lines are misaligned with the the engraving, so everything comes out goofy and unusable. It’s like the cutting is happening 3-5mm across from the engraving.

On a smaller run (or a singular item) the engraving/cutting lines up fine, but on a larger run it loses it and goes all over the place.

Any ideas why this might be happening?
Thanks in advance

[NeilTee (MR N THORNLEY)]

Here’s an example of what I mean, all should be aligned.

[Kuth (Luis Jardim)]

By the charred on the corners I would say you have acceleration or speed high values.

Can you please post a screenshot of layer settings?

[NeilTee (MR N THORNLEY)]

This is the layer that was most offensive lol. Although the engraving layer also messed up quite a lot. Let me know if you need anything else screenshotting

[Kuth (Luis Jardim)]

So,… you are using mm/min as unit speed. This is not convencional for common diode lasers like mine, so I think you are using other kind of laser machine. Can you tell us what laser machine are you using?
However, check if any of these situations arise.

Engraving Shifted Relative To Cut Lines - LightBurn Documentation

[NeilTee (MR N THORNLEY)]

It’s an OMTech 60W CO2 laser…

[JTR (Tyler Raps)]

Check your laser’s controller display when the project runs — if the same errors you see in the result are replicated there, this is transfer/controller error.

Some things that may help are Sending the job to the controller and starting it from there, or clearing files off the controller. Ruida controllers have been known to act up when they accumulate a lot of files.

If that doesn’t help, this is a mechanical issue, and you’ll need to give your machine a once over.

[ednisley]

@NeilTee

It’s like the cutting is happening 3-5mm across from the engraving.

This can be a peculiar symptom of the Ruida Skewed Engraving config problem:

Configuring a Ruida Controller - LightBurn Documentation

This discussion tracked down a similar problem:

Image shifting and bunching up but cut out is OK

Red-Black 90w Laser Ruida controller engrave 400mm/s 25% Fill 450mm/s 20% Cut 25mm/s 65% Birch ply held down pins belts are tight so are stepper motors When doing a engrave/fill and cut I get the fill shift while the engrave bunches up, cut out in just fine. This is repeatable, and all come out the same, like it was meant to be, how do I attach image?

[dos (Daryl)]

@Kuth

So,… you are using mm/min as unit speed. This is not convencional for common diode lasers like mine, so I think you are using other kind of laser machine.

Just for clarity for those reading in the future… the OP is using mm/second (which is conventional for CO2 lasers) rather than mm/minute (which is conventional for diode lasers).

[Kuth (Luis Jardim)]

@dos

Just for clarity for those reading in the future… the OP is using mm/second (which is conventional for CO2 lasers) rather than mm/minute (which is conventional for diode lasers).

Daryl you are absolutely right!
I wrote it wrong sorry once again. with my attention in translation I didn’t realize I had changed the words.

Now knowing your machine is a Ruida, I will step aside because I know from what I’ve been reading that Ruida’s have some peculiar issue’s due to it’s control board.
There are users with much more knowledge in this type of system than I do.