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Re: Retaining Things?
Tapped holes on the ends of shafts + fender washers work reasonably well. Shaft collars are pretty bulletproof as well as long as you get the clamp-on variety rather than those that use set screws. These are very nice, but pricey. For weight and size, nothing beats retaining rings or E-clips (the snap-on variety, not the toothed ones that come with CIM pinions), but you need to machine the groove yourself. Not too hard to do with a lathe and the right tool though, in either hex or round stock.
A side note, keys really shouldn't be used to retain items axially.
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FIRST is not about doing what you can with what you know. It is about doing what you thought impossible, with what you were inspired to become.
2007-2010: Student, FRC 1687, Highlander Robotics
2012-2014: Technical Mentor, FRC 1687, Highlander Robotics
2015-2016: Lead Mentor, FRC 5400, Team WARP
2016-???: Volunteer and freelance mentor-for-hire
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