The 1/16" dimensions of my octagonal feature


GeneDavis
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My dilemma is this.  I had to put an octagonal "silo" feature on a barn per the client's request, and I used CAD to guide me, drawing an octagon with 4'0" sides.

 

Now I have the whole thing built, framing included, and it is time to dimension for layout.  I go auto dimension and the plan is full of dimensions to the 1/16".  Having built houses and never having seen plans done to the sixteenth, I wonder what to do.

 

Is this just the nature of bay and polygons in plans drawing?  Do the builders complain, or just work it out?

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Gene:

 

I would do these to the best of my ability - get frustrated

and send them to my partner to "fix"

 

in a case like this you "probably" should be able to get all sides to 4' exactly

 

if not, setting one to round to the nearest 1" would "probably" be ok

 

as the builder should use the stated dim and not try to scale from the drawing

 

but if it's a "critical" area ???

 

Lew

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Thanks, Scott.  

 

What I did was select only the dimensions or strings that had the 1/16" accuracy, and changed the format to only go as fine as 1/8".  What happened is as shown here.

 

Only the mathematicians in the foundation-building crew or the framing crew would say that it is wrong.  Doing an octagon in a 9'-8" square results in sides that are about 1/32" longer than 4'-0". 

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