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.

  1. Step 1:

    Create conical and cylinder.

  2. Step 2:

    Create helix.

  3. Step 3:

    Project helix on conical.

  4. Step 4:

    Create helix on cylinder.

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