hello:
every time i try to revolve or try to subtract a revolve i get a error message if you can help thank you,
mike
Beware of the cross part sketch reference. I have no idea what you are attempting to revolve, but based on your errors, I would guess you used references from another part in your sketch. These are notorious for causing failures and errors, as they have a tendancy to get lost, especially if you use a surface or edge as a reference, and then change the part it came from. Just a guess, but I would look at your revolve sketch and try to remove any cross part references. Use work features (planes, axes etc) instead.
Chris Benner
Inventor Tube & Pipe, Vault Professional
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