Starting and finishing a thread for a bolt etc.
grabcad
A method for the start and finish of a thread when modelling a bolt. Using the taper option within the Helix function creates a thread that runs out gradually as opposed to stoping abruptly, which appears to be the case with most of the threaded bolt examples found on Grabcad. It's not perfect but hopefully it makes sense. Added alternative method using variable pitch helix.
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