Can't get laser to turn on for burning text

I bought a Onefinity cnc and Jtech laser. I downloaded the Lightburn software and have been going thru the software on how to setup the program. I am having trouble with burning the text I create. The laser only turns on to do the box around the text. Gcode works fine and CNC moves like it is working but laser never turns on.

Hi Jeff, could you upload a screenshot of you’re project with the cut/layer settings, it’ll help others to be able to help you.
Many thanks.

These are worth review: Common Grbl Setups - LightBurn Software Documentation

and: Troubleshooting - LightBurn Software Documentation

And for your setup, JTech has some great resources to ensure you have the configuration set correctly, using macros, allowing you to switch back and forth, CNC / laser and back.

I have Carveco Maker +

When then you say “the box around the text” are you referring to a box you’ve drawn around your text, or the outline of the text itself?

If you mean it’s only drawing the outline of the text it’s because you’ve got your layer set to “Line”. Try setting it to “Fill” instead.

If I’ve misunderstood the problem, then sorry…

I load the Gcode into my onefinity cnc. everything starts moving when I push play. the router makes all the moves like its supposed to do. the laser does not turn on until it starts doing the line around the text.

Ok, thank you. I am not sure why you are providing this information. If you have a specific question or comment about the information I provided, I’ll try to assist. :slight_smile:

Was just l letting you know what software on the cnc i an running.

It’s because you’re using the GRBL-M3 profile in LightBurn, and that is currently broken, but will be fixed shortly in our patch update. If you switch to using the ‘GRBL’ profile, it will work as long as you do not have ‘Fast Whitespace’ enabled.

The GCode is being emitted using G0 moves for skips, and the OneFinity controller does not shut the laser off automatically for those. If you use the GRBL profile, it uses G1 moves for everything, and sets the power to 0 for travel moves.

THanks. That fixed that problem. Now the laser comes on as soon as i start the job.

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I reloaded my file to burn my shop logo , which worked numerous times before, now its back to not turning on the laser until the end of the job. I just bought the full version and now its back to not working.

Purchasing the software does not change settings. Click the ‘Save GCode’ button, save it to a text file, and attach the file here so we can have a look, in addition to a screen shot of your cut settings.

For what it’s worth, saying, “it does not work” is not helpful - If I told you my car doesn’t work, where would you have me start looking? The more specific information you can give, the better, for example:

  • It doesn’t appear to be communicating at all - I don’t see anything in the console
  • It connects, and it moves, but the laser doesn’t fire
  • When I click start, there’s a loud noise, and the machine just grinds

Any of the above would give us at least something to work from. Saying “it doesn’t work” means I have to ask you things like, “In what way doesn’t it work?” meaning you don’t get a solution nearly as fast.

So - In what way doesn’t it work?

I figured I could continue on with this same thread. Didn’t realize I had to start over. I Was instructed to use GRBL instead of GRBL-M3. It worked for a while until I reloaded my saved project file. That’s what I meant when I said its not working again.
This was what I was told:
It’s because you’re using the GRBL-M3 profile in LightBurn, and that is currently broken, but will be fixed shortly in our patch update. If you switch to using the ‘GRBL’ profile, it will work as long as you do not have ‘Fast Whitespace’ enabled.

The GCode is being emitted using G0 moves for skips, and the OneFinity controller does not shut the laser off automatically for those. If you use the GRBL profile, it uses G1 moves for everything, and sets the power to 0 for travel moves.

; LightBurn 1.0.00
; GRBL-M3 (1.1e or earlier) device profile, user origin
; Bounds: X10.01 Y10.01 to X20.02 Y20.02
G00 G17 G40 G20 G54
G90
G0 X0 Y0
G91
; Scan @ 5 mm/sec, 100% power
M9
M5
G0X0.1719Y0.0934
; Layer C00
G1X0.0063F11.811S1000
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G1X-0.0341
; Cut @ 5 mm/sec, 100% power
M8
M5
G0X-0.0249Y0.0526
; Layer C01
M3
G1X0.394
G1Y-0.394
G1X-0.394
G1Y0.394
M5
M9
G1S0
G90
; return to user-defined finish pos
G0 X0 Y0
M2

You’re still using the GRBL-M3 device, and you haven’t updated LightBurn to 1.0.01. Changing to ‘GRBL’ or updating to 1.0.01 will fix your issue.