Burned Corners on MDF Cuts with Creality Falcon 2 – Reduce Laser Power on Direction Changes?

[cfb70ok (cfb70)]

Hi everyone,

I’m having issues with this laser cutter. I’m cutting a clockmaking wooden piece using 5.5 mm MDF material. It seems the heat is burning the corners/tips of the cuts.

Is there any way to reduce the laser power when the laser changes direction at the corners? I think the machine slows down at those points and burns the material.

I’m using the latest version of LightBurn with a Creality Falcon 2 laser cutter.

Any advice would be appreciated.

cfb70

[parsec (FerAS)]

Welcome to the Forum @cfb70ok
Did you set your Laser device as plain GRBL?
Also did you changed any GRBL settings?
You can post your Laser device for us to check:

Export - Devices - LightBurn User Guide

[cfb70ok (cfb70)]

Hello @parsec !

Thanks for your reply

Yes, I set the laser device as plain GRBL in LightBurn but and I didn’t change any GRBL settings.

[parsec (FerAS)]

If you’re using 2 passes use 1 pass and a clone sub-layer instead.

Lightburn Super Trick

Hello to all. Instead of making multi-pass cuts in intricate details where laser burns the same segment over and over again and that sometimes leads to material burn… You can automatically make 1 pass cut plus 1 pass cut plus 1 pass cut and so on to let material cool a bit. Using Lightburn sub-layers like in the enclosed example. It take a few seconds more but gives much better results. At the end of the job start the job again (3 times in this case) or use cut job with 9 cloned sub-layers, …

Sub-Layers - LightBurn User Guide

If not sing out.

[cfb70ok (cfb70)]

Thanks for your quick response. I’ll give it a try! I’m new to all this, and the tip is truly very helpful for me. I’ll let you know how it goes.

[MikeyH (Mike Hembrey)]

@cfb70ok

any way to reduce the laser power when the laser changes direction

Turn off the Constant Power switch in the Layers window.

[Kuth (Luis Jardim)]

In addition to everything already mentioned, I’m leaving this link in the Lightburn documentation which I think has information related to the problem you’re reporting.

Corners Are Too Dark, Too Light, Or Missing - LightBurn User Guide

[cfb70ok (cfb70)]

Thank you @MikeyH

[MikeyH (Mike Hembrey)]

Solve your problem?

[cfb70ok (cfb70)]

Thank you @Kuth I’ll test in my workbench in the afternoon.

[cfb70ok (cfb70)]

Hi,

I tested a partial cut of the piece by making three passes (three sublayers) at a speed of 1850 mm/min and 82.50% power. In the photo, I’ve superimposed the newly cut piece over the fully cut parts. The new cut shows no burnt edges, unlike the previously cut piece shown in the background.

I may still fine-tune the speed and power settings a bit further, but the result is already so good that I couldn’t wait to share it with you, mark the issue as resolved, and thank you for the prompt support you provided.

Cheers!
test.lbrn2 (89,2 KB)