I have been cutting acrylic letters for a while now but yesterday while trying to cut the machine started acting weird. While cutting different passes on a profile tool path in V-Carve pro v8 the bit is trying to cut like a slope, but it's not consistent in where or how it does it. I have attached some pictures. I have tried using different bits and different shanks. I did put in a 1/2 x 1/2 bit and cut it just to see what it would do and it worked. Of course this is too big of a bit to use. I have tried 1/4, 1/8 and 1/16 bits all with the same results.
I have changed feed rates, number of passes and RPM's and nothing works. It seemed like it did get a little better with a feed rate of 3 and rpm of 19,000 but the number of passes didn't really matter. The material is .375 acrylic.
Any help would be appreciated.