Or put a 60° chamfer (60° cone angle) or better, a 75° chafer (for a 30° cone angle) on the end of a helical pipe:
The above shows a 1.245 chamfer on a 2.5 diameter pipe, but it's too blunt.
Again, I've already tried many things. The curvilinear nature of the pipe axis defeats most methods I've attempted.I've run out of ideas.
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