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helix around outside radius

Question asked by Mr Turtle on Apr 12, 2019

variable helix.JPG

I would like to wrap a circular tube around the face of this radius bulb shape, do I need to create a viable helix to do so? Because when I attempt to do an angled helix It does not stay concentric to the outside face as the outside face is not a straight angle. Could I perhaps sweep a circle around the face instead that follows the y-axis but is tangent to the outside face?