Fill + line not aligned

[micrololin (Jeff)]

Lets go back to @PKKid suggestion and check the belts.

[plav1959 (Paul Lavoie)]

And, thanks for everyone’s help so far!!!

[jkwilborn (Jack Wilborn)]

I’ve seen similar when the grub screw is walking out isn’t quite loose…

@micrololin

PWM

Don’t know why they call it that as it’s not a pwm output, it just tells the motors which edge is active.

Guess it’s like air assist ending up ‘wind’…

[micrololin (Jeff)]

PWM is Pulse Width Modulation. Has to do with the digital square wave signal.

[jkwilborn (Jack Wilborn)]

Everything that is digital has a square wave signal. Few are PWM.

The output from the controller is only steps/direction.?

[micrololin (Jeff)]

Just going by something I read

[JohnJohn (John Johnson)]

Are you currently engraving your scanning fill in one direction? (bi-directional off) If so, the offset image willl be offset in one direction. It’s caused by the minor delay in turning on the CO2 Laer tube at speed.

This may be worth review:

Improve Engraving Quality (Correct Scan Offset) on CNC Co2 Laser RD Works/LightBurn Software Config

Russ says ‘belt climb’:

Understanding Backlash & Scanning Reverse Interval (2018)

[jkwilborn (Jack Wilborn)]

His error in the output is way larger than you could compensate/fix with these methods.

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It appears that the offset is increasing along the Y axes going up.

How is this engraving? Order wise…

Is the fill starting at the bottom?

[Aurich]

This feels similar to a problem I had:

Problem with Skewed scans

I fixed this problem with the rising edge valid fix. I forget now which one was wrong, but on my Ruida they both match now, and one was false and one was true in my settings. Try both ways. If I had to guess it was my Y set to false and it should have been true, but just going by memory. Good way to check if that’s the likely issue is do a test engrave on some cardboard, and set it to fill+line. If that’s the issue the engrave will be skewed, but then the line will go back and outline properly.…

Try changing your rising edge settings. Be smarter than me and note what they are now. Then change just one of them. If that doesn’t work revert and then change the other one.

[RGUERI1 (RUSTIN GUERIN)]

I think you are experiencing the same issue I have. See my post here: Scanning Offset table not recognized after 1.0.0.6 - #2 by JohnJohn

The examples I show are some test patterns but essentially my results on actual projects are appearing just like yours. I haven’t had a chance to send the log files that Lightburn Requested but I just reverted back to a 1.0.xxx release and it works correctly again. Read my post for all the details. I’m assuming you are running a 1.1.xxx version of the Lightburn software? Hopefully that solves your problem, I just about pulled my hair out trying to figure it out. Good luck.

Here is the link to previous versions. I found 1.0.06 to be the last version that worked for me. Any 1.1.xx produced the error.

Releases · LightBurnSoftware/deployment

[ConsummatePro (Steve Wong)]

Definitely agree it’s VERY likely a PWM Rising Edge Valid setting: I had a similar problem with my Omtech 55W and based on the fb group I suspect many Omtech 55’s are misconfigured from the factory with this same issue.

As I understand it both the x and Y PWM Rising Edge Valid setting should be the same (as they are using the same motor on the X and Y) - for some reason mine shipped with one True and one False. I flipped the x to false and left Y at false and it fixed my problem. Note your machine might need the opposite setting.

Check the Lightburn documentation here: and look at the section on Skewed engraving at the bottom.

https://lightburnsoftware.github.io/NewDocs/ConfiguringRuida.html