Line and Fill mismatch

[hiveworldjunkie (Danny Jones)]

Hi all,

Its not a specific Lightburn related query I think its more related to the machine.

I am running a HPC 6090 with a Ruida controller 6445G(I think)

For a little while now I have been experiencing some mismatch on the line and fill settings and it usually becomes apparent on larger batch prints where the laser moves further away from the homing point (top right). To me it doesn’t seem to have a specific point where it starts to drift out of sync with each other because when I have previously started a 900x600 wide batch of engraved/lined the mismatch between engrave/line has become noticeably apparent at the far left of X, same for bottom of Y and left of X, as it moves back from these points to the homing point it gets better and worse across the whole work piece.

If I do a one piece engrave or line and cut item close to home this issue doesn’t seem to be as noticeable. That said anymore than one item it starts to become apparent ever so slightly. See image:

Previously I have had to replace a stepper due to the age of the machine on the X axis however when that started to fail it became very erratic during engravings. The only issue here is my engrave and outline are drifting apart.

Just trying to figure out what it could be as apart from this minor issue and running smaller batches the machine is ok! Will post my setting file up when i have time the machine is currently being moved into a workshop.

Any assistance is much appreciated!

[ednisley]

@hiveworldjunkie

some mismatch on the line and fill settings

For a Ruida controller, the first thing to check is PWM Rising Edge Valid:

Configuring a Ruida Controller - LightBurn Documentation

An incorrect setting for either axis (or both!) can produce a variety of weird symptoms, so take a look.

@hiveworldjunkie

replace a stepper due to the age of the machine

Take a very close look at the belts, because an old machine may have worn the teeth right off:

X axis step size just changed?

ok this makes no sense but apparently the htd 5m belt linking the stepper to the x axis was worn enough that it wasn’t acting as a timing belt, more like a tire. it wasn’t JUST skipping steps, it was freely walking over the teeth and not using them at all. no only was it a small scale error, there was no bumping in its raster where it jumped a tooth, and it was so repeatable that a vector ruler followed by a 1000mm/s raster didn’t screw up or misalign the raster in any way and a second pass at…

Check those out and let us know what you find.

We’ve found screenshots of the Machine Settings values show the configuration better than photos.

[hiveworldjunkie (Danny Jones)]

Thanks for the info, I will check on these and get back to you

[hiveworldjunkie (Danny Jones)]

• PWM rising to false on both axis so I am going to set them opposite for both axis sequentially and test individually.
• Belts look like they have teeth

Currently in the process of moving the machine to a workshop so once its back up and running will run a few files that have been known for mismatch at the extremities of the work area from the top right home i.e. Top Left, Bottom Left, Bottom Right.