Bow String TRuss

[JH75]

Hi,
I am making a Bow String Truss but run in to some trouble. I want to put a dimension between the Quadrants of the 2 arcs but I can't get the lines (arcs) to lock to the ref planes. Please see attached image.
I drew the ref planes first and then the arcs.
Am I missing something here?
Thanks

[Dimitri Harvalias]

Jonas,
Try using arc reference lines instead of dealing ref planes. I've attached a sample to illustrate the basic concept. It's a generic model but the same principles should apply to a structural family.
Ref planes are great because they tend to be a little more forgiving in terms of automatically setting up constraints. Once they are flexing properly they can be used as the path for sweeps for the top and bottom chords of the truss.

[JH75]

Thanks Dimitri,
That works really good :) Thanks for example it really helped.
Cheers,
J