What's happening is the cutter is lifting the material when it cuts the
walls of the pocket and that results in a shallow slot around the
periphery. So, what you do is do a separate finish pass on the walls but
stay .001 up from the bottom. Then take a finish pass on the floor to
depth but stay .001 off the walls.

fred

Yeah.
Terry, how thin is the material in the bottom of the pocket? Maybe holding
down the blank with double sided tape would help with this.
Randy