+ Reply to Thread
Results 1 to 1 of 1
  1. #1
    Super Member Bill Tillman's Avatar
    Using
    AutoCAD 2014
    Join Date
    Oct 2008
    Location
    Miami, FL
    Posts
    1,043

    Default Weight per Foot for Alum Extrusion

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

Similar Threads

  1. I need a 3D model of a foot
    By dumfatnhappy in forum AutoCAD 3D Modelling & Rendering
    Replies: 12
    Last Post: 15th Jun 2009, 03:07 am
  2. How to inpout in imperial units (Foot-In)?
    By Abbas in forum AutoCAD Drawing Management & Output
    Replies: 9
    Last Post: 12th Dec 2007, 04:57 pm
  3. Please check! i need to add foot mark '
    By ascen707 in forum AutoLISP, Visual LISP & DCL
    Replies: 3
    Last Post: 13th Jul 2007, 01:12 pm

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts