Engraving/machining acrylic

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thanks for all the info

I have a denford micro router, which is enclosed. I did wonder if things in general were getting hot yesterday, it was a hot day and once I closed the door of the router there is no air movement inside.

Do you have any dust extractor? In my opinion that is VERY important.

how small can you get single flute cutters? I want to engrave so didn't want to go any bigger than 1mm really

The smallest bit I am using is a 0.5mm but it is a dual flute. Feed rate is EXTREMELY critical, run it just a tiny bit faster and it snaps. But... if you are engraving for LED signs then V-bits are better unless you need to engrave large letters or remove a lot of material, because those are more rigid. Never the less, if you run it too fast or too deep you will snap off the tip, especially the tiny 10degree 0.1mm are very sensitive.