Cut extrusion at corner of an object

[atdNMH7S]

I'm having trouble with cut extrusions at the corners of a rectangular plate.

After creating the 88mm x 112mm x 3mm plate, I placed the centers of center-diameter circles at each of the rectangle's four corners, then selected E, selected the four circles, chose the "cut" option in the Extrude dialog, and began dragging the extrusion. This consistently returns an error "No target body found to cut or intersect!" I was confident the direction of the extrusion was correct, but I tried changing this too, without luck. I also tried moving the circles' center points in from the corners of the rectangle a millimeter or two each, but this didn't help.

By contrast, if I place a center-diameter circle on the surface of the rectangular plate, with the circle entirely contained within the rectangle's surface, the cut extrusion works normally.

Is there a reason why a cut extrusion won't work at the corners of a rectangular object? Is there a workaround?

[laughingcreek · Accepted solution]

are you selecting the part of the circle profile that is actual on the rectangle, or the just the part of the profile that is hanging off?

attach your .f3d file for better help.

[atdNMH7S]

Thanks! Pretty simple mistake on my part -- I was thinking of each of the circle's surfaces as a unitary area, but I must have been selecting the portions that were hanging off the rectangle. When I redid it now making sure to select the parts of the circle profiles on the rectangle, it worked fine.