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using extrude to cut away material, but its backwards
i am having a problem with using the extrude function to cut away some material. i know to choose the extrude option, then to change it to cut mode, and then i select the part of the sketch that i want cut away, but it removes everything that is not selected. its been a while since i used inventor but i dont remember that ever happening. btw im using inventor 10.
i have included some screen shots of what is going on.
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