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Discussion Starter #1
I'm planning my next metalworking projects. Rather than just over build, I'd like to do some math and size my materials somewhat appropriately. I'm looking for different calculators, charts and even just ways to learn more about calculations for load, strength, weight, etc. For example:

Here are some nifty tubing calculators

I'm not doing anything structural, or that serious, but I'd like to know a little more than guess at what I'm using to save weight and more importantly money.

So, what online resources do you use?
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