How to create teeth on the curved surfaces of cylinder

Hi,

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MH

Make the tooth-ridge solid and extrude/cut a single V.  Then pattern the V cut.

Is this a functional gear or simply a tooth pattern?  What is the purpose of the model?  The what is the purpose of the part?  etc...

Look for the wrap option (not warp). Create a cylinder surface and then wrap a datum curve that is the shape of the teeth onto it. Then create a variable section sweep driven by the edge of the cylinder and referencing the wrapped curve. Not going to guarantee it works; but that's what I would try.