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Before you spend on other jigs and things. Use a straight or spiral up cutting bit to cut a groove close to the opening size you want to end up with. Then switch over to the dovetail bit without moving your straight edge and recut.I think the reason you are not getting clean or straight cuts is the dovetail bit can't easily clear the chips. By making a groove first you leave less for the dovetail bit to remove and the chips clear more easily.Pete
Before you spend on other jigs and things. Use a straight or spiral up cutting bit to cut a groove close to the opening size you want to end up with. Then switch over to the dovetail bit without moving your straight edge and recut.
I think the reason you are not getting clean or straight cuts is the dovetail bit can't easily clear the chips. By making a groove first you leave less for the dovetail bit to remove and the chips clear more easily.
Pete