I have some of the Rowmark Ultramatte reverse engraving acrylic plastic.
Basically it's a 1/6" product that is clear on the front and black (or many other colors) on the back. You reverse engrave the colored side and then use acrylic paints to paint the engraving.
Pretty slick looking stuff once it cut and painted.
I called Rowmark to ask about typical cutting speeds and motor speeds but they didn't know or have any technical data.
Usually this sort of material is cut on an engraving machine and I guess there must not be motor speed and feed rate settings? Just a guess.
I am using my small cnc machine to reverse engrave with a single flute 60degree carbide engraving bit.
Did one short test engraving yesterday and it came out ok, not awesome, but ok.
I have my cnc machine tool running through a Variac, so I can slow the motor down from it's 30,000 max rpm. Not ideal, but it works ok on plastics.
Long winded post I know:
Just wondering if anyone out there has used this material and has some suggestions on feedrates and motor speed settings?