I have created a part which is symmetrical. I need cutouts on both ends of this part. I sketch thes cutouts on one end and then I want to mirror the features about the center line of the part. I place a construction line at the center of the part (at the origin point); this is my mirror line. When I attempt to mirror the cutouts about this line a message appears: "Adding this constraint will over-constrain the sketch." But when I move the mirror line off center, the features mirror without a problem. I have to perform a move to place the cutouts though. Why?
Thanks.