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Originally Posted by artdutra04
I've been using 2024 and 7075 for shafts on FRC robots since I was in college in 2010, and have never had one fail. Plus, I absolutely love machining 7075 aluminum on mills and lathes. With good carbide tools, you can machine it like a hot knife through butter, as it does not have any of the galling issues that plague softer aluminum alloys. It's my second favorite material to machine after Delrin.
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I will totally agree that aluminum, especially 7075, machines really well. However, we have a tough time getting anything but 6061 locally. One of our former mentors went out and got some cheap aluminum from a different alloy in the 6xxx series that machined like garbage. Regardless of speed, feed, or cutter age, it rolled instead of cutting. It reached a point where I would have preferred to be cutting gummy stainless (AL6XN).
However, I digress. We've bent a number of aluminum shafts and torn up the surface of others in bearings, so we're gunshy about going that route again. I'd be interested to know what installation and mounting techniques you use for the aluminum shafts.
Quote:
Originally Posted by artdutra04
// Note: I didn't directly link to the Matweb pages for 2024 and 7075 since apparently the links are tied to cookies and 404 after a while.
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Whoops.
Didn't realize that. Sorry. The short form was that the materials listed matched the chart in the post for properties and that the galvanized was not significantly different from the 1018.