LarryO Posted May 27, 2022 Share Posted May 27, 2022 I think this has been around for some time but I never needed accurate area calculations before so I didn't take notice. The calculation of polyline areas presented in the OIP is outside of standard acceptable tolerances. I only used the WideFlange because I was attempting to calculate weight when I noticed the error and that it was significant enough to alter the weight of a beam from which cost estimates are derived here in Canada. Have I missed something??? Quote Link to comment
LarryO Posted May 27, 2022 Author Share Posted May 27, 2022 (edited) Yes, I absolutely have made an error. I was using radius as Diameter. 20.02x20.02=400.8 10.01x10.01xπ=314.787 Δ 86.01 2914.82+2914.82+1655.25+86.01= 7570.90 against 7573.19 mm2 Δ 1.1 2.29 (I really need to use a calculator more often) Not as bad as I had figured. Edited May 27, 2022 by LarryO 1 Quote Link to comment
P Retondo Posted May 27, 2022 Share Posted May 27, 2022 I doubt the error is even that great. The numbers you are manually calculating from are rounded, but CAD sees things to 7 or so decimal places. Quote Link to comment
LarryO Posted May 28, 2022 Author Share Posted May 28, 2022 Yeah, It only amounts to about 110 grams now for a 6M length of average sized W200. Not enough to worry about anymore. There is more error in the steel mill manufacturing process than that. Quote Link to comment
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