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In Reply to: RE: Shaft Extensions / Panel Bearings posted by Triode_Kingdom on July 10, 2017 at 19:23:55
I'm not quite clear on what your are trying to accomplish. A support for a switch with a long shaft or an arrangement to extend a shaft through the panel. In the latter case they are common in electrical switchgear and the coupling should provide enough play that your concern should not be a concern. I'm off on a road trip so I don't have the time to search. If you could elaborate further I'll check in periodically. Or it might spark Eli's or someone else's imagination. I did find the link below.
Keystone in the US also manufactures parts like that. The fit between shaft and hole is somewhat variable, and it often gives the knob a clunky feel that I dislike. I suppose there are a couple reasons this doesn't happen directly at the shaft of a switch or pot. For one thing, the manufacturer has control over the dimensions of both the shaft and hole, so tolerances can be tighter. Also, the parts are usually designed to be greased, which cushions the effect.
When I assembled the front panels for my SETs a few years ago, I bushed the holes for push switches with press-fit Delrin inserts. That worked really well, but it requires additional time that I was hoping to avoid in this case. Maybe there's no choice. I could use a 3/8" panel bearing and bush it down to 1/4", or maybe turn down the 1/4" shaft where it passes through the standard panel bearing and add an internal plastic sleeve. Like I say, was just hoping I could buy my way out of doing this. :)
Buy Chinese. Bury freedom.
The original RM-5 from Music Reference used bearings as you mentioned in the OP and onece we solved certain issues -below - they worked quite well-
the only issue we had was galling then the bearing and shaft were the same material-
The comment above regarding sizing is appropriate and will - if addressed properly - make a difference in the Knob feel-
Delrin or PTFE (Teflon(r)) make excellent bearings but can be a challenge to machine correctly-
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