I encountered a problem regarding the focus height and therefore the result of my engraves. Maybe it’s just the settings so I hope you can help me.
I’ve a Glowforge basic.
The tests were made on 3mm MDF,
I measured approx 0.135 inch in thickness.
For my customers I often engrave thin lines on products they already have, mostly on 3mm material (acrylic and MDF).
From time to time I have the problem that the engraved line is thicker and slightly misaligned - the laser was out of focus.
Most of the time, the problem occurs when I engrave transparent acrylic because the auto focus does not work here.
The idea was that I’ll do some tests to get a fixed value I can set the focus height of the glowforge to so I don’t need the auto focus.
But… the results are confusing - see picture.
As I said, the “material thickness of uncertified material” is set to 0.135 inches.
The “engraves” were all cuts, speed 200, power 20, 1 pass and different focus heights: from 0.01 to 0.28 aaall lines looked exactly the same. This just does not look right to me.
After that I set the focus height to “auto” and got exactly the same result.
Focus height set to 0.135 inches with material thickness set to 0.135 gave the result I aim for.
I was curious if 0.135 focus height is the exact right setting so I set the focus height to 0.135 and the material thickness to 0.136 (to be sure, the focus height isn’t set auto). The result was the worst.
So, after all this testing I’m very confused.
How can I set the focus height to a fixed value and still get the thinnest line possible…?
Thanks in advance!Strichtest.pdf (152.2 KB)