I’ve been reading through the forums for a bit but I haven’t found a post with an exact duplicate problem, so hopefully someone with more experience can answer this.
I’ve been cutting acrylic charms from a sheet of PG Medium Acrylic using the automatic PG settings. I’ve done this before with no issue, but today something is weird: All the charms are cut from the same sheet using the exact same SVG file and the same cut settings, yet half of them are burned on the back with the acrylic melted into scorched divots, making the charms unusable. The other half are perfectly cut with lovely smooth edges.
Top row clean cuts, bottom row burned cuts with and without masking. They were all laid out next to each other when cutting.
After reading other posts I wondered if this might be a flashback issue, but that doesn’t explain why it’s only happening on half of the cuts. These pieces are side-by-side on the same tray. What’s causing the 50% damage rate?
If it is a flashback issue, what material can I use to prevent it that won’t 1) alter the height of the acrylic to the point that it affects my engraving detail, or 2) flare up and cause further scorching of the masking material?