I did some material testing yesterday, wood works flawlessly, aluminium well yeah, my steppers are shitty (used from a cheap 3d printer, they are really weak and overheat badly if you turn them up, new ones are ordered) but acrylic didnt seem to work. all i got was a molten glob on the gland end.
i was using a 2 flute 1/8" endmill and a feedrate of around 600mm/min @10.000rpm.
does anyone know what would be a good starting point? i’m not sure if i need to move faster, turn the spindle down or what the deal is. how much DOC should i chose ect.
For plastics, single flute and o flute shapes work great. You need to move pretty quick for acrylic, and make big enough chips to keep the bit cool. I did a few things in acrylic on the mpcnc, I think I did 22mm/s, 1mm DOC using the 660 turned down. That’s fairly fast for the mpcnc, but it was okay in acrylic.