Constraining Parallel Angled Lines

[BugFinder]

I have two lines which I need to be parallel regardless of the angle (highlighted in red):

As soon as I change the angle, I get they are no longer parallel and I get an error:

How can I constrain these so that they are parallel?  Is there specific constraints or do you have to use additional dimensions?

Thanks

[syman2000]

Did you lock the dimension?

[barthbradley]

Are both lines originating from the same work plane?  If not, I can see why this would happen.  

Maybe this will help: 

Keys to Rotating Items Inside Revit Families | Applying Technology to Architecture (wordpress.com)

[SteveKStafford]

Add angle constraints between each segment so you define each relationship clearly. If you're in the family editor you can create a parameter to govern the angle and place angle dimensions for each parallel line and assign them to the same angle parameter.

If you're editing the sketch of a ceiling/floor in a project then it's probably just easier to use Rotate to reposition them correctly. Or temporarily use a global parameter to drive the angle after adding more dimension constraints (see image).

[BugFinder]

Hi,

Tried connecting the line endpoints to the horizontal and vertical planes as per link by @barthbradley and also tried @Steve_Stafford method with angle parameters for each line.  As per @syman2000 suggestion, the dimension is locked.

And this is what I get...

This isn't the exact one as in the first post so I did it again so that I could create a screencast but the issues are exactly the same...

 

[syman2000 · Accepted solution]

I would create Model lines and use the as your rotating parameters. Then create your model and pick those model line as your guide. See attached for sample.

[amedina · Accepted solution]

There are different ways to do it, as you have seen in this thread. I would do it in this way:

I constrain the starting point of each reference line to the intersections (1 & 2) of two reference planes. Then I control the angle of each line with the same parameter (A). The distance between the intersections can be controlled by another parameter (Y).