Quote:
Originally Posted by Jeff K.
Looks like a nice shaft..from the left of the damage. Is that 6061, 7075, or 7068?
Do the Outbacks come with that Aluminum shaft or did you just make it yourself? If they came with, then they seem to be the Banebots of last year. 
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There's no way those are 7075 or 7068, or anything stronger than 6061. We've been using 7075 for years, and we've used and abused all our robots. We've never even seen serious wear to a keyway in 7075, letalone something as mangled as this.
I wouldn't look at this as a testament to why steel is better. I'd look at it as a prime example of what happens when you choose the wrong alloy material for a high stress application. Many teams have been using aluminum shafts with great success. There really is no reason to use steel, if you have the proper machining resources to make your own shafts out of Al.