Quote:
Originally Posted by AndyB
I'm not 100% sure on that. I found the cad file of the design and noticed that the wall thickness was .1in, but that's hardly accurate. In a design like this, I'd probably use .08-.09" for 6061 aluminum or .03-.05" for some sort of galvanized steel. I'd probably use sheet steel just because it's readily available to us.
I've never actually worked with sheet steel within FIRST robotics. I tried doing some research on it but couldn't find much in terms of second hand experience. I've used chromoly steel back when I was with 269 but the properties of chromoly extrusion and galvanized sheet steel are probably pretty different as well. I've heard the number 3x the weight/strength when compared to aluminum but I have no clue if that's correct or not. It was with chromoly extrusion compared to aluminum extrusion which is why we could use .035" wall thickness extrusion.
So to answer your question Akash, .08-.09" Aluminum or .03-.05" Steel.
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One of the general rules of thumb when working with sheet metal is that aluminum sheets need to be 40% thicker to achieve similar structural properties. Since .080 to .090 wall thickness aluminum sounds about right for a well designed FRC frame, the equivalent steel thickness would be a little higher than your estimates, in the .060 to .063 range.
Depending on the actual alloy used however, these figures will vary.