Using rib on revolved feature?

The rib feature has some inherent limitations that won't let it work if has to start exactly on that top edge. If that is the requirement, then you'll have to build it with a combination of features, probably an extrude and then revolved cut to trim away the extra.

If it's allowable, you can simply drop the top of the rib off that edge a little bit and the rib feature will work.

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