How can I do a helical cut on the inside of a lid with alibre design 2011 please?

I drew the bottle and I now I don't know how to draw helical cut on the inside of the lid and how can they perfectly fit together?
Thank you

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1 Answer

Basic plan is to create the cutting groove shape in a sketch placing it so it overlaps the material you want to remove and then use the helical cut tool to rotate the cuttign through the path.

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