I have had good luck using both the 1mm and .5mm diameter ball nose endmills from SpeTool. I am usually only engraving 50 to 100 thou. deep into 1/4” coloured acrylic. I started using the spade bit type but was breaking them almost as fast as Amazon could deliver them. I am using a 300 watt Genmitsu 3030 at 12k rpm Feed rate of 635 mm/min and doc 0.5 mm. Any melted swarf can be knocked of with a light fingers touch.
On some worry some carving I reduce feed rate to 25 in mm and a DOC of .02 in at 12k rpm.
Aluminum tags are usually done at a DOC of 0.13 mm and a feed of 1270 mm/min.
I get quite a few plates before the cutter gets dull. What do you use for settings and 1/8 or 1/4” cutters?
