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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


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