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  1. #11
    You may be able to save a bit of time analyzing the components using this:

    https://skyciv.com/free-moment-of-inertia-calculator/

    It does shapes such as I beam, T beam and angle as well as tubes.

  2. Quote Originally Posted by Voicecoil View Post
    You may be able to save a bit of time analyzing the components using this:

    https://skyciv.com/free-moment-of-inertia-calculator/

    It does shapes such as I beam, T beam and angle as well as tubes.

    That's quite a handy calculator, so it might be all you need.


    But if you want to know what it is doing, there are quite a few steps involved (which is why you are better making a spreadsheet if you want to do lots of them). I've shown a worked example which uses 2 rectangles in a T shape. You can make any shape using more rectangles but need to include more terms in each equation associated with each new rectangle.

    The T shape is worked through in 7 steps:


    Click image for larger version. 

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    Click image for larger version. 

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    Hope this helps.
    Building a CNC machine to make a better one since 2010 . . .
    MK1 (1st photo), MK2, MK3, MK4

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