Frame Family reference -(was Help needed on this one)

[Alek Sutulov]

I've been trying all morning but no luck.
I need to flex this frame so that left and right heights change up to comlete reverse. Beam height has to be constant or has capability to change, but not random.
Any help appreciated.
Alek

[PeterJ]

Replce your reference planes forming the sloped head of the frame with invisible symbolic reference lines and lock the ends of these to the intersecting planes at either end.

Take you two minutes.

[Alek Sutulov]

Thanks Pete, it worked although I don't understand why it won't work with ref planes.
Alek