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Thread: Align and lock an arc - door swing

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    Junior Member Wiley's Avatar
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    Align and lock an arc - door swing

    Good morning,
    I am working on a door with a frame. Everything is working great with the exception of the swing, an arc. The door swing stays in the same place no matter what I try. Is there a way to align and lock an arc or am I going about this the wrong way?

    Thanks
    Wiley

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    "Mark Twain"
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    I think you're going at it the wrong way. You should align the ends of the arc. When starting the align function, select the line you want to align the arc to, find the end of the arc and use tab a few times until a dot at the end lights up. This you can align and that should work...

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    Member RabbitHole's Avatar
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    Are you talking about when you ajust the size of the door?
    The swing arch does not adjust acordingly?
    When you draw in the arch line make sure that you useReference Planes as snap points for the arch ends. When drwan the you will have two locks appear on the reference planes. Just lock these and the swing arch should stay in proportion.

    If this is not what is wrong with your family, sure some one will come along with the answer.
    Cheers

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    Junior Member Wiley's Avatar
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    Thanks for the help. Yes, the swing arch did not adjust accordingly, it stayed in the same relation to the wall no matter what door size I selected. But I finally got it to work. I used Center-Ends-Arc instead of the Start-End-Radius-Arc. That seemed to help. I also found the dots at the ends of the arcs.

    Thanks
    Wiley

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    Forum Co-Founder Alfredo Medina's Avatar
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    Quote Originally Posted by Wiley View Post
    T... I used Center-Ends-Arc instead of the Start-End-Radius-Arc. That seemed to help. I also found the dots at the ends of the arcs.

    Thanks
    Wiley
    Hello, Wiley! nice to see you here.

    About this issue: you can do the arc with a Center-ends arc too. That is no problem. Actually, you do not need to lock the arc. It is enough that the center point and the end point use the intersection snap to the existing reference planes. In this illustration I am providing, the arc is drawn using a Center-ends arc from point 1 (center of arc, snap intersection) to point 2 (start point of arc, snap intersection), to point 3 (end of arc, just in line with the left reference plane). No lock is required. Then the line is drawn from point 1 (snap intersection) to point 3 (snap endpoint), and then, Revit offers two locks for this line (vertical and horizontal). Lock the line in these 2 directions, as shown, and the door swing will work fine. No need to lock the arc itself. The snap constraints are enough for the arc.
    Attached Thumbnails Attached Thumbnails Align and lock an arc - door swing-door-plan-swing.jpg  

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    But you will need to lock the ends though. And by locking those you also constrain the insertion point, since this is on the crosshair of both ends.

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    Forum Co-Founder Alfredo Medina's Avatar
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    Quote Originally Posted by mdradvies View Post
    But you will need to lock the ends though. And by locking those you also constrain the insertion point, since this is on the crosshair of both ends.
    Beyond the process that is shown in that image, no more locks are required for the plan view representation of the door swing to work correctly, adjusting itself to changes in the width of the door. We tend to think that everything needs to be locked, but the snaps play their role, too.

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    You're totally right Alfredo. But it's the same statement I made earlier in post #2 (only called it aligning because that's what you need to do when you already placed the arc...). Glad we're on the same page here. I totally agree that you don't need to lock everything, in my book use this as little as possible... Otherwise it will always come back to bite you.

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    Forum Co-Founder Alfredo Medina's Avatar
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    Quote Originally Posted by mdradvies View Post
    You're totally right Alfredo. But it's the same statement I made earlier in post #2 (only called it aligning because that's what you need to do when you already placed the arc...). ...
    I see a difference. I am saying that just placing the arc with intersection snap points at the center and the start, and then doing the vertical line afterwards from endpoint to endpoint, and then locking this vertical line in two directions is enough for the door swing to work. As you see, I don´t align the arc. You are suggesting to align the end of the arc to the reference planes, using the tab key until finding the arc's end point. Probably the procedure is different depending on the type of method chosen to draw the arc. In my example I use the Center-Ends method. If you do the arc with the Start-End-Radius method, it might be different.

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    Yes, but you are locking the vertical line to the refplane. Since chained linework stays in one piece the arc endpoint will indeed follow the vertical line. And since you use the center-ends method it will work for both sides of the arc.
    It's simply a choice of going left or right:
    left: lock the endpoint(s) of the arc and you only need to snap the horizontal and vertical line to the endpoints of the arc OR
    right: lock the vertical (and horizontal) line to the refplane and you only need to snap the arc.

    In both cases you don't need to lock both the lines AND arc. It does indeed make a difference which arc you use. The center-ends method generally means you have one constrain less than the start-end-radius (although I personally find the last one easier to use). Center-ends only needs to lock one end (or only a vertical line), start-end-radius needs to lock both ends of the arc (or a horizontal and vertical line)
    Last edited by mdradvies; February 26th, 2011 at 03:17 PM.

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