cnc machine stiffness calculator

[routercnc]

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:









Hope this helps.