Lines in engraving text

LightBurn Software Questions
1

Hi All

I have a K40 laser that I have just changed from the stock controller to a Mini Gerbil.
Previously I was using Inkspace with K40whisper. I was happy with the performance of K40whisper but wanted more features hence the upgrade.

I am now pulling my hair out with the quality of engraving on Acrylic and MDF.

Below is a photo of what I am use to with my stock setup

20200628_205044
20200628_205044670×893 109 KB

But despite changing many settings and researchig online I can not get anywear near as smooth engrave with Lightburn.

Below is the results of MDF

20200628_204640
20200628_204640670×893 207 KB

Below is Acrylic

20200628_204616
20200628_204616670×893 89.6 KB

I have tried a mixture of power, speed and line interval settings with no major increase in quality.

20200628_204830
20200628_204830670×893 208 KB

Does anyone have any suggestions on how to improve the quality?

2

Set this to 400 Lines per inch or higher

Screenshot_20200628-224857_Samsung Internet
Screenshot_20200628-224857_Samsung Internet1440×2960 1.83 MB

3

Hi Andreas

I have tried increasing the lines per inch to 400 and even 600 with no major increase.

20200628_215318
20200628_215318670×893 96.3 KB

4

the acrylic has been processed with too much power.

is the mdf bad with 600 lines per inch?

5

MDF is less noticeable.
I have reduced the power and adjusted the speed with only a small improvement.

Below is the settings used

20200629_100841
20200629_1008413024×4032 2.76 MB

This gave the following results

20200629_100813
20200629_1008133024×4032 1.5 MB

20200629_100804
20200629_1008043024×4032 1.75 MB

6

I quickly did that 1cm big

20200629_115116
20200629_1151163024×4032 3.58 MB
20200629_115250
20200629_1152501512×2016 1.74 MB

7

Hi Andreas thank you for your help so far.

I can see on your engraving there is still visible lines.
Is there anyway to remove them?

8

the lines are there because I was very precisely in the focus point with a 1.5" Lens, if you go further away with the focus point, the point gets bigger, so the lines run into each other.

9

Hi Andreas

I looked at all the Gcode settings for my controller and noticed $110 (x axis speed) was set far higher than the Y axis. I reduced the speed and now the engraving matches your attemp and is much more consistent.

I will try offsetting the focus to remove the lines.
I’m truly grateful for your support on this issue.
Thank you very much.

10

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