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Forums >> Revit Building >> Technical Support >> Dimension Override / The Ghost 1/32"

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Thu, Jul 3, 2008 at 9:13:12 AM | Dimension Override / The Ghost 1/32"

#1

zabel


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Joined: Wed, Jun 4, 2008
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This is wild.

See the attached images.

 

I placed one dimension between two walls as shown in the RevitDim_01.jpeg image that comes out to 27'-3".

 

I added two more Witness Lines using right click-Edit Witness Lines.  The subsequent dimensions add up to 1/32" less than the total of the split dimension!

 

Are there tolerances that are off?  Ideas for fixing this?

 



Attached Images

39942_RevitDim01.jpg39942_RevitDim02.jpg

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Thu, Jul 3, 2008 at 10:09:05 AM | Dimension Override / The Ghost 1/32"

#2

lunchtrayrider


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Joined: Sun, Jun 24, 2007
592 Posts
3.5 Stars: 7 Votes


yea redraw your stuff right.  Its off by small amounts that cause rounding errors.

-----------------------------------
I like scooters. and motorcycles.

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Thu, Jul 3, 2008 at 11:00:43 AM | Dimension Override / The Ghost 1/32"

#3

zabel


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Turns out that imported CAD drawings tend to be accurate to 1/256" which means tracing them is a bad idea when dimension rounding is set to 1/32" (even more so when the coworker who drew them was not careful while rushing toward a schematic deadline).  Still, hard to avoid when you're new, don't know these things, and are pressed on a ridiculous design development deadline yourself.

 

The method is also a pet peeve of mine but under the circumstance of time I had to run with it.

 

Redrawing things accurately from scratch is not an option at this stage, nor a constructive solution. 

I ran into 2 other solutions that are constructive, and feel compelled to share:

 

1) Lower the Dimension Rounding value < i.e. to 1/256" > and tweak wall placement.

>Select the dimension string in view > Element Properties > Edit > Type Properties

Toward the bottom, under TEXT (of all places), is Units Format

>Click the box next to it

>Unclick Use Project Settings in the subsequent window, and adjust settings.

Tweak wall placement.

Reset rounding if desired.

 

2) Draw reference lines or planes starting at a wall that will not be moving.

Doing this allows you to accurately control distances between reference objects.

Align the incorrect walls to the references, do not lock.

Wa-la.

 

I also just got a tip from someone that the Tape Measure is more accurate than dimensioning (because of rounding values) when checking walls.

Edited on: Thu, Jul 3, 2008 at 11:02:11 AM

Edited on: Thu, Jul 3, 2008 at 11:02:35 AM

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Thu, Jul 3, 2008 at 11:33:15 AM | Dimension Override / The Ghost 1/32"

#4

lunchtrayrider


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So yea, the two methods you have are basically re-drawing.

-----------------------------------
I like scooters. and motorcycles.

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Thu, Jul 3, 2008 at 11:52:49 AM | Dimension Override / The Ghost 1/32"

#5

zabel


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So yeah, thanks?


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Tue, Jul 8, 2008 at 9:30:09 PM | Dimension Override / The Ghost 1/32"

#6

bauhaus1919


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I feel for you zabel. I once started a project file from scratch at the DD-to-CD transition because of all the "help" I got during Design Development.

 

You can do the same thing you were talking about without a couple of those extra steps. Start at one end of a dimension string. Skip the first (usually exterior) wall and select the next one in. The dimension numbers on either side turn blue. If working left to right, click the number to the left. In the edit mode it shows the more accurate number and you can type in the nice round number it should be. Click the next wall. Click the blue number to the left and retype the dimension to something proper. Wash. Rinse. Repeat.

 

Even if the number is to a "pretty" number in the dimension edit mode, I retype it anyway because it is rounding too, just at a higher precision. By entering a number it makes it EXACTLY that dimension. Also, when I "trace" AutoCAD, I just let it set the first wall. Copy-multiple and as I get ready to set each one I look at the temporary dimension to see what it is "trying" to be and type that number (or the closest round number) in to get it exact.


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