Hey all! I’ve been working on some game tokens using red proof grade 1/8" acrylic. It cuts just fine for the most part, but I always get areas of scorching and melting on the back of the material. I’ve tried with and without the backing. It’s most noticeable around some small lettering. There are other areas of noticeable heat bloom as well. I’m not sure what I can do do avoid or fix this, but it’s putting me off a bit. I plan to work mostly in acrylic but I feel like there’s a lot to learn about this medium.
I’m using a mono-line font, so it’s not doing a double pass. And now that I think of it, for some reason the GF software is making the outer circle a double pass even though there’s just one path in the file. I’ve seen it do this before but I’ve never been able to figure out why that would be. On the last one I cut, the first pass dropped the material down and then the second pass messed up the edge since it was sitting a bit crooked. What gives?
I’d love a little advice, here, since I’m getting a bit frustrated. I feel like I’ve tried to make a sensible pattern that should cut well, and it’s just not working out. I even went as far as making about 7 layers to space out cuts that were too close together, thinking the heat would dissipate and I wouldn’t see as much bloom and distortion.
You might want to put some extra material (thin card stock or cardboard) under the piece. You might be getting some flashback from the laser hitting the grill under the piece. Sometimes even the backing paper isn’t enough to really protect it.
Yeah, sometimes that doesn’t seem to be enough though. I had a huge acrylic piece I ran a couple months ago that had the backing on it. It gave me these weird squiggles on some of the border areas that drove me crazy trying to figure it out. Then I realized that it followed the pattern of the grill under it. I wound up cutting up the cardboard soda case from my recycle bin and put that under the piece. The weird deformations/squiggles went away. That grill can get pretty toasty when it gets zapped with the laser.
Ideally you would adjust it a bit. I didn’t think about it at the time and just left the settings as is and my piece still came out looking great. I would certainly adjust if I were putting a thicker cardboard under it.
If your cut is making two passes you have two paths (lines, circles, whatever) in your file whether you can see them or not. If you want to post an example of your file there are generally plenty of people that will take a look and try to help.
For the material falling away, you can fix that by keeping the material flat, use magnets, clips, whatever.
An index card can be enough to stop flashback on your piece, anything with discernible height needs to be factored into your material height calculation.
That’s an interesting file. I played with it a bit.
On your original file you’re going to keep burning the $%!# out of the text because of the serifs (the teeth will continue to be a problem too). I made a second copy with a different font, that shouldn’t be as problematic. I put several different colors in to discriminate the layers, but that is easy enough for you to change.
The double cuts should be gone.
(new text) EDIT: This text will not cut right, A will be problematic
I loaded both files in the GFUI but didn’t try to print them.