how to create detail thread on conical face?

I just want to create the detail thread on the conical face along with cylindrical face. i tried but the detail thread not getting on the conical face

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If I understand your request correctly - you could just create your helix then project it onto your surface. Then reverse the helix and join with the one you just projected and check tangency.

Answered with a tutorial: https://grabcad.com/tutorials/how-to-create-detail-thread-on-conical-face

 
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