disc with dado

disc with dado

has anyone figured out how to route a shallow dado into a circle?

when i scan with SMA i get this...

 for some reason it wants to pocket the whole inside and when i try to add the dado to a plain disc i can't get it to lead-in without catching part of the inside or outside of the dado. our machine won't plunge with the bits we have. any help with this would be appreciated.

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