jjmontiel Posted January 8, 2015 Share Posted January 8, 2015 Hello everyone, I have searched an answer for my problem but everything I've seen explains what I have done. I need to get the Moment of Inertia of a corrugated metal section, so I created it with Pline then converted it into a region. After I run Massprop on the section this is what I get: ---------------- REGIONS ---------------- Area: 6.7800 Perimeter: 54.7402 Bounding box: X: -12.0009 -- 11.9991 Y: 0.9798 -- 5.3638 Z: 0.0000 -- 0.0000 Centroid: X: 0.0000 Y: 3.4942 Z: 0.0000 Am I doing something wrong? I have done it by hand already but this is bothering me since it has worked before. Thank you all before hand Quote Link to comment Share on other sites More sharing options...
ReMark Posted January 8, 2015 Share Posted January 8, 2015 Can you attach a copy of a drawing to your next post that includes just the corrugated profile? Quote Link to comment Share on other sites More sharing options...
jjmontiel Posted January 8, 2015 Author Share Posted January 8, 2015 Sorry here is the attached file. By the way, I am using AutoCAD 2014 Mechanical Corr_metal.dwg Quote Link to comment Share on other sites More sharing options...
ReMark Posted January 8, 2015 Share Posted January 8, 2015 (edited) Thanks. Give me a moment. I'll be back. OK...here you go. I had to add the ".txt" in order to upload the file here. Corr-metal MassProp.mpr.txt Here's your drawing back. CorrugatedSiding.dwg Edited January 8, 2015 by ReMark Quote Link to comment Share on other sites More sharing options...
jjmontiel Posted January 8, 2015 Author Share Posted January 8, 2015 Thank you for your help. What was the issue? I've exploded the file you sent, created a region and got the answer. Thanks again Quote Link to comment Share on other sites More sharing options...
nestly Posted January 8, 2015 Share Posted January 8, 2015 As far as I can tell, the reason it wasn't working is because it's not at zero elevation relative to the current UCS. (ie the elevation is reported as Z = -0.00001070 when the precision is increased in the UNITS dialog box) Original Massprop analysis: ---------------- REGIONS ---------------- Area: 6.78002999 Perimeter: 54.74023995 Bounding box: X: -12.00085347 -- 11.99914653 Y: 0.97977829 -- 5.36377829 Z: -0.00001070 -- -0.00001070 Centroid: X: 0.00000939 Y: 3.49415511 Z: -0.00001070[/i] Massprop analysis after moving to to Z=0.00000000 ---------------- REGIONS ---------------- Area: 6.78002999 Perimeter: 54.74023995 Bounding box: X: -12.00085347 -- 11.99914653 Y: 0.97977829 -- 5.36377829 Centroid: X: 0.00000939 Y: 3.49415511 Moments of inertia: X: 102.54027605 Y: 308.11512515 Product of inertia: XY: 0.07828562 Radii of gyration: X: 3.88894171 Y: 6.74125416 Principal moments and X-Y directions about centroid: I: 19.76205517 along [0.99999996 -0.00027226] J: 308.11514652 along [0.00027226 0.99999996] BTW The same result can be achieved by moving the UCS to the object, instead of moving the object to the UCS Quote Link to comment Share on other sites More sharing options...
jjmontiel Posted January 9, 2015 Author Share Posted January 9, 2015 Thank you nestly, that clarified the issue. Quote Link to comment Share on other sites More sharing options...
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