how to create detail thread on conical face?
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.
-
Step 1:
Create conical and cylinder.
-
Step 2:
Create helix.
-
Step 3:
Project helix on conical.
-
Step 4:
Create helix on cylinder.