Distorted text - but only some letters?

[santinif4 (Mike Steel)]

Does anyone have a fix for any of these 3 issues I have here? Thanks

These are the issues I am having now. Monport K40 CO2 laser.
(1) Why are the 4 green highlighted texts distorted like they are , but the rest of the print came out fine?
(2) Why is the Bi-directional acting incorrectly?
(3) Why is the Crosshatch acting incorrectly?

It is a 3mm thick white acrylic with two coats of black paint that is being removed by the laser.

The LightBurn settings were as follows:
Speed 900
Power 26%
Bi-directional OFF

• Bi-directional is off because when it is on, it produces a “ghost” texting slightly to the left or right of the original text (horizontally displaced)
  Crosshatch OFF
• I have to turn Crosshatch OFF because when it is on, it produces a ”ghost” texting
  that is vertically displaced slightly above or below the original text.
  Overscan .5 %
  2 passes

The mirrors are set and everything is calibrated, including a ramp test to set correct height.

[ednisley]

@santinif4

a fix for any of these 3 issues

They all look like USB communication problems trashing a few commands every now and then.

Some earlier discussions shed light on the problem:

Laser stops running after a few seconds

Hello. I’m new to the forum but have been using my OMTech 70W Co2 laser for a couple years. I’m wondering if anyone else has had an issue with the laser stopping after a few seconds. I was running a batch of stuff and as soon as I changed files, Lightburn said it needed to be updated (to version 2.0.02). I did the update and that was it. Every time I try to engrave, it stops after a few seconds. Nothing else changed except for the update. I’ve reinstalled old versions, rebooted everything, and n…

My Cherokee Beast

WOO HOO !!! I got everything working right , FINELY !!! What was the problem? It turns out to be the USB to Controller board cable was faulty. That was the only thing I failed to check and that was it. I have a bad habit of buying one to use and one to loose. When I thought about the cable being bad, I got the cable out the spare controller kit and that one worked. I feel really stupid sitting here thinking how I spent 4 to 6 weeks crying and trying to fix this thing and never though…

USB Cable Issue

I have just purchased a Gweike Cloud RF laser, using with Lightburn. The supplied USB cable works fine but it’s very short. So I bought a nice long one, 5 metres length. USB C to USB A, I use Macs. It’s a good quality cable, but I don’t seem to be able to make a connection when I plug in to the laser and to my Mac? Any suggestions/fixes most welcomed. I came across a really useful post by @BillieRuben who seems to have knowledge of these machines and setting up, any idea Billie ? tia

Because it’s a K40 machine, it probably does not have the ability to use an Ethernet connection, which tends to be far more reliable than USB.

@santinif4

• Bi-directional is off
• Crosshatch OFF

Fix those by measuring and setting the Scanning Offset Adjustment at a variety of speeds:

Scanning Offset Adjustment - LightBurn Documentation