I've had some better success using the "spoiler" plate and these bits
http://cgi.ebay.com/30-degree-bits-f...3A1%7C294%3A30
But I'm still coming up the learning curve. I'm using 1/8" acrylic painted with a few coats of black spray paint. Using an end mill always leaves the edges raggy. Using the V tip engraving bit (above) does a better job, but I haven't had much luck with leaving a mask (tape) on. If I leave a mask (packing tape, masking tape, scotch tape) on before I engrave so I can paint the engraved letters white, the tape always gets too raggy and lifted up. Any suggestions?
Thanks,
Mike