Learn how to model screw threads using helical curves and booleans in Rhino. The threads shown are the type you would see at the end of a light bulb. Changes to the cross-section profile and path will provide you with ways of making alternate styles of threads as well.
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Video: 1 of 2
If the Flash player does not work, use these links...
https://vimeo.com/2862473
https://vimeo.com/2862536