Added 1/2" To Measurements?

[HumbleChief]

I think I understood this at one time but am a bit baffled by the behavior today. Each measurement in the pic is set to a whole number measurement but each measurement has an added 1/2" when finally displayed. Doesn't present a genuine problem in this case but could in a different context. Any help appreciated.

 

...and it only happens in this room.

 

THANK YOU

[winterdd]

1 minute ago, HumbleChief said:

I think I understood this at one time but am a bit baffled by the behavior today. Each measurement in the pic is set to a whole number measurement but each measurement has an added 1/2" when finally displayed. Doesn't present a genuine problem in this case but could in a different context. Any help appreciated.

 

THANK YOU

I share your pain on this and interested to hear feedback.

[DBCooper]

Could be lots of different things such as your dimensions going to the drywall instead of the framing.  But if I was to make a guess, I would bet that it has to do with how you are rounding your dimensions and how accurate you laid out your walls.

 

Your picture is not really enough to tell what is going on.  Post your plan.

 

[JiAngelo]

I think you need to check your wall locations.  Circle 1 wall without drywall matches up with exterior finish material (NOT interior drywall)  Circle 2 wall without drywall matches up with interior drywall (NOT exterior finish material)

 

Second, you are missing some necessary measurements to make a proper comparison.  Extend and find out the distance from 11' 8-1/2" to interior drywall of left wall (to compare with 14' 8-1/2" measurement.    

Do this with other locations, like the 6' 8" and 9' 6-1/2" measurements.

 

I think you will find you are mixing/measuring interior layer (drywall) to main layer (stud) in several areas.

[HumbleChief]

Thanks and maybe to the theories but, as I always do, I select a wall, type in the measurement as in i.e. 11' - 8" then hit enter and the measurement shows as 11' - 8 1/2" - and only in this room? Have this happen and explained in the past but can't remember why Chief will sometimes behave this way. Has some thing to do with rounding algorithms? Dunno.

 

 

Will post the plan

 

 

[HumbleChief]

Plan File

 

https://www.dropbox.com/scl/fi/9zodnj1oqzs7lp0p237p8/HALF-INCH-ADDED.plan?rlkey=uwj3jys74jstjtg41jrvba3o6&dl=0

[HumbleChief]

Interesting?

 

 

[JiAngelo]

Larry,

 

Thanks for posting the plan. I was wrong about your walls.  Your interior wall has the stud wall painted white.  Only the number 1 wall was off, but you fixed it in the uploaded plan.

 

In your video, when you are fixing that wall, at the 1:20 mark you point to DIM 12' 5-1/2", click on it, and it reads 12' 5 7/16", to which you then state "that's close enough."

Well, it isn't unless you decided to allow precision to be off or round itself in the defaults somewhere.

 

While visiting your default dimensions "ANNO FLOOR PLAN" I saw it was set to Grid rounding - and I think that explains what you are demonstrating in your second video.  It is like your walls weren't drawn on the grid initially.

 

Click on Primary Format and you will see it is set for accuracy 1/2.  I changed this to 1/16 and here's what your dimensions immediately turned into.

To fix this, just change these two walls.

• The exterior wall with 3 windows, make that dimension 10' 1/2"
• The closet wall, change that dimension to 2' 6-1/2"

 

You can check all your other dimensions but they should be correct now.

[HumbleChief]

Thanks for the reply John. I have my primary dimensions to default to 1/2" because I don't want anything more accurate than that in my plans hence 12 - 5 7/16" is indeed close enough - for me. And YES it was the grid rounding setting that was causing the issue (I kinda remember that from the past now). Will probably never understand that but don't really need to and will change the setting going forward. And again thanks very much for taking the time to look over the plan!

[basketballman]

Primary dimension format set to 0 will avoid this ...

[JiAngelo]

Larry, change your General Plan Defaults snap unit to 1/2" before drawing should keep you on your grid rounding.

To test this I drew a random rectangular polyline which measured 2'9" x 3' in your original plan file.  I added dimensions with a 1/16 precision to show you what was actually drawn was quite different from what your original dimension defaults showed.  

Here I also discovered that Chief doesn't round up at 2'8 3/4", it rounds down to 2'8 1/2"

 

And Bob, what you suggested is only better at hiding it.  Changing accuracy to 1/0 reverts to 1/1 and then only displays whole numbers.  It rounds 2'8 1/2" to 2'8" and 2' 8 17/32" to 2'9

 

Here's a comparison of all three precision methods.

With less precision the errors can compound over farther distances.

Notice 1/2" precision has a rounding error occurring between 5/8" and 3/4"

And 1/1" precision has a rounding error alternately occurring between each of the 2' 8-5/8" measurements.  One measures 2'9" the other 2'8"

 

I'm pretty sure all of this traces back to the 1/16" grid this plan file was drawn on.

 

[HumbleChief]

Thanks again John but 'the reference grid' and grid snap units are two different thing to my understanding and I use the snap units to nudge and locate objects small amounts. The 1/2" simply wouldn't work for me. To quote you "I'm pretty very sure all of this traces back to the 1/16" grid grid rounding this plan file was drawn on" and thanks for your help in discovering that info.

[para-CAD]

Is this a clean plan or did you have other walls near there that have since been deleted?

I've seen ghost walls do crazy things sometimes.

[JiAngelo]

Larry,  I didn't articulate it properly. Take the original drawing you sent us and again select all. 

 

MOVING LEFT/RIGHT  (1/16" increments)

• Move left 1 time and your left/right measurement's 1/2" error disappears in the upper right living room. 
• It reappears at 8, 16, 24, etc... if you keep moving left.      
• In Action History select Open Plan to revert back to original drawing. 
• Move right 1 time and your left/right measurement's 1/2" error disappears in the upper right living room.
• It reappears at 9, 17, 25, etc.. if you keep moving right.
• In Action History select Open Plan to revert back to original drawing. 

MOVING UP/DOWN (1/16" increments)

• Move up 7 times and your up/down measurement's 1/2" error disappears in upper left bedroom.
• It reappears at 15, 23, 31, etc... if you keep moving up.
• In Action History select Open Plan to revert back to original drawing.
• Move down 1 time and your up/down measurement's 1/2' error disappears in the upper left bedroom. 
• It reappears at 9, 17, 25, etc.. if you keep moving down.
• In Action History select Open Plan to revert back to original drawing. 

Now turn on Auto Exterior Dimensions.  Repeat the above steps, returning to Action Step "Auto Exterior Dimensions" instead of "Open Plan" each time.

Notice different measurements jump around, several at different increments from those outlined above.  

 

Return to Action History = "Auto Exterior Dimensions" and it is obvious the wall with 3 windows has a 1/16" problem. (move it down 1/16")  Then select the following,

• The upper left bedroom closet wall  - it has a 1/16" problem. (move it down 1/16")
• That closet's vertical wall adjacent to dead space - it has a 2/16" problem (move it left 2/16")
• The wall behind 1/2 bath? (door in room below closet rear wall) - it has a 2/16" problem (move it down 2/16")

Now repeat the LEFT/RIGHT, UP/DOWN movements and you should see no errors at any of the aforementioned increments.  Basically, 

• a 1/16" grid only matches up with 1/2" rounding at a +/- 8, +/- 16, +/- 24, etc... progression from wherever on the 1/16" grid you draw.. 
• And multiple walls on 1/16" at 1/2" rounding can exacerbate and create multiple errors over distances.  It even hides those errors that cumulatively fall on the progression by accident or design.

And speaking of design,  

• Your redwood walls are a 4" stud layer with 3/4" int./ext. layers.
• Your existing interior walls are 3-1/2" stud layer with 3/4" int./ext. layers.
• You need to reverse the red wall and line up with the interior side to match the other two.
• Changing siding to 1" and keeping drywall at 1/2" would help keep you on the 1/2" alignment.

 

If only your dimension defaults were set to 1/16" then every time you see anything but whole and 1/2" incremental measurements you'd see the error immediately and could correct it then, or wait until the end and correct it as I have shown. 

 

I hope this helps.