I have been unsuccessful in carving anything other than larger signs in script. The sign I tried to carve now is 8" W x 3.5 H.
No matter what I try. Different speeds, feeds, depths the sign comes out "hairy" if you know what I mean. Tried various 60' bits, different material from plywood to solid. Doesn't matter. I have been successful in carving a larger sign with 1/8" end mill but when you shrink the sign down the gaps are too small for the tool. It appears that the v bit tears the surface on first pass and yes the bits are sharp. First one I used was brand new.
Any suggestions would be helpful.