Michael A. Terrell wrote in message
...

N_Cook wrote:

Why do they not use "dry lubricant" perhaps
locksmith's graphite as long as in a minute quantity.


The grease is needed to prevent metal migration across the open areas
as they slide. I've seen people try to run similar items dry, or with
other crappy lubricants. Graphite would need something to hold it to
the board, and you would need enough that would cause leakage as the
sliding contact compacted it to the surface. Good old fashioned 'GC
Tunerlube' does an excellent job on sliding contacts.


--
You can't have a sense of humor, if you have no sense.


I can see that with multifunction DVM rotary dials where there is small gaps
between tracks. But the 2 rotary encoders I looked into this week were about
1mm wide spokes tracks with the contacts at the periphery so spaces of about
5mm of insulator disc material