Bill Tillman Posted October 13, 2009 Share Posted October 13, 2009 I used to have a LISP that would calculate weight per foot of aluminum extrusions. Many of these extrusions were hollow shapes with complex surfaces. I lost track of this many years ago but so I was hoping someone here might know how I could get something like this working. The attached file shows one of the extrusions I'm working with. I can run MASSPROP on it and get some information but how would one determine how much weight for aluminum would be involved with this and how could I calculate it in a fairly accurate manner? UPDATE: OK I think I figured out this much. The MASSPROP command tells me this thing has an area of 2.0874 square inches. I found a website which lists the weights and specific gravities for materials and it shows aluminum weighs 165 lbs per cubic foot. Based on that information I calculate: 1 cubic foot = 1728 cubic inches 165 / 1728 = .095486 lbs per cubic inch thus 2.0874 * 12 inches = 25.0488 cubic inches per foot for this shape thus 25.0488 * .095486 = 2.39183 lbs per lineal foot for this shape As extremely accurate measurements are needed for this exercise I used the above precisions for my calculations. I'm very rusty at this stuff so any comments or suggestions would be appreciated. I recall the LISP program I used for this years ago would actually draw a nice box around the text and it would make a informative print out next to the shape you ran this on in the model space. But that was way back in AutoCAD 10. Extrusion(01).dwg Quote Link to comment Share on other sites More sharing options...
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