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    Super Member Bill Tillman's Avatar
    AutoCAD 2018
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    Oct 2008
    Miami, FL

    Default Weight per Foot for Alum Extrusion

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    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?


    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


    2.0874 * 12 inches = 25.0488 cubic inches per foot for this shape


    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.
    Attached Files
    Last edited by Bill Tillman; 13th Oct 2009 at 05:12 pm.
    It's deja vu, all over again.

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