I'm having a problem doing some dovetails on 3/4" Birch plywood. I have a brand new PC 4012 jig w/ bit and I'm using a DeWalt 618 Router. I'm getting some really bad chipout and just tearing up of the plywood. I start the bit going into the wood very slowly and it's either tearing up the board right as it goes in, or it'll start just shreading it while it's in mid-cut!
The bit is brand new and came with the jig. It looks clean and I can't see any problems with it. I tried cutting some solid poplar I had laying around and it seemed to cut just fine. But, when I try the plywood, it just tears the layers apart! I mean it will actually kick back a few of the layers at you when It gets half way in.
So, what am I missing here? Is it a technique thing or is there a chance the bit is bad and I just can't really tell? Suggestions?