Let’s say that I have an aluminum-bearing block-plastic spacer-shaft collar-gear-steel washer-aluminum arrangement in a joint.
Where should I put Teflon washers in this arrangement, if I wanted to minimize friction?
Putting it between the steel washer and the aluminum might make sense because it is metal-to-metal contact, which isn’t exactly known for being low-friction.
Around the spacer, though, is where I get stumped:
should I put a Teflon washer between the bearing block and the spacer,
spacer and the shaft collar,
or should I put one at both of those places?
Should I just not put one in, at all?
And then, there’s this argument against putting Teflon washer between the steel washer and the aluminum:
if I were to put it between the gear and the steel washer instead of between the washer and the aluminum, even when the shaft is turning, the steel washer might stay stationary due to the static friction between it and the aluminum being greater than that between it and the Teflon washer, while the dynamic friction between the stationary steel washer and the rotating gear will be minimized thanks to the Teflon washer.
In other words, we get to have less mass on the rotating body by excluding the steel washer from it, while retaining the friction-reducing property of Teflon washer.
This should result in less load being put on the motors, meaning more better, and more better, as we all know, means more good.
This argument is undermined, however, by my experience of seeing swing gears work(on YouTube).
As far as I can tell, spinning axles seemed to miraculously turn the supposedly-free-spinning gears on them, which makes me believe that spinny things impart spinniness to neighboring bodies.
If I were to force the steel washer to stay stationary with the axle spinning, I might just be causing dynamic friction to happen between the steel washer and the axle, wasting kinetic energy.
So, where would you put Teflon washer(s) in this context?