Problem with Helix creation

[Vagulus]

I wish to create an helix with an oblique quadrilateral cross-section. Helix works fine with a simple circle but refused to work with the drawn cross-section. I have done all the checks on the cross-section sketch I can think of but it just won't create a screw.

Would someone please tell me why not.
Pitch 70mm
Radius 100mm
Turns 1

Thanks

OS: Windows 10 Version 2009
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.24291 (Git)
Build type: Release
Branch: releases/FreeCAD-0-19
Hash: 7b5e18a0759de778b74d3a5c17eba9cb815035ac
Python version: 3.8.6+
Qt version: 5.15.2
Coin version: 4.0.1
OCC version: 7.5.0
Locale: English/New Zealand (en_NZ)

[Grub]

In your sketch, you need to convert your 2mm segment into construction geometry:

https://wiki.freecadweb.org/Sketcher_ToggleConstruction

[drmacro]

You have a Tee intersection in the profile.

Snip macro screenshot-00ec3c.png (106.74 KiB) Viewed 508 times

[Vagulus]

You have a Tee intersection in the profile.

Thanks for pointing me in the right direction.
The problem was that the cross-line was not a construction line.
When I made it a construction line the right angle constraint did not matter.

All good now.