I received some VEXPro material today, from an order placed before kickoff. I'll be testing a fixed ratio gearbox and a Versaplanetary later on. Today we started working with the 7075 shaft stock and related components.
This stuff is really great! The first thing we worked with was some 1/2" hex shaft stock. Facing the ends we were impressed with how nicely it machines. It is noticeably harder than 6061, and this is apparent when cutting with a band saw, but facing the ends was not very different from facing 6061. The faced surfaces are beautiful.
As promised, the hex shafts slide nicely into bearings with no sticking or jamming. The collars are nice and small, fit properly, and feel very secure when tightened.
The hex shaft stock also fit into a hex hole that we broached in one of our standard steel poly-vee J-section pulleys using a duMONT 77713 that I purchased from McMaster-Carr (2875A24). The fit is a little tight, but we like it that way.
I will be using VEXPro
shafts, bearings, and hardware for a project in the research lab at my day job -- and I suspect a lot of this same stuff will prove useful on my team's FRC robot as well.
Nicely done, VEXPro!
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Edit: after posting I ordered a couple of gears for my day job project, and received notification that they have been shipped within 20 minutes of the order.
Freaky fast, kinda like McMaster, or Jimmy Johns. 
__________________
Richard Wallace
Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
since 2003
I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)