I have been having trouble with my z axis cutting to deep and digging into my spoilboard. I set my file to z at the table not the material. Then z-ed to the table. I have verified the z was correct by manually by plunging to z-0 with the router off and spinnging the bit to see if it cuts. In my file i have set the depth of cut to .74 inches to cut 3/4 MDF. I run the cut file and when it is done i have a nice grove cut into my spoilboard i havent measured it yet but it is at least .05. Any ideas what might be going on?