On 8/25/2013 Roger (K8RI) on TT wrote:
> Brass was mentioned, but it's usually "Oil light" which is a porous
> Bronze, not Brass. If the axle is a good fit and smooth these last
> quite well even with an off center load as long as the off axis is not
> extreme. OTOH 0.45" is getting pretty narrow for much off center load.
> I've never seen commercial bearings of regular brass although I'm sure
> they exist. I'd not expect them to be anywhere near as durable as "oil
> light", or bronze bearings which you mentioned with SS sheaves.
And one of the interesting things is that Oilite bearings actually hold up
under static shock loads (think wind loading on a tower cable that doesn't move
that often) MUCH MUCH better than ball or roller bearings. Ball/Roller
bearings will Brinell (develop flat spots in the balls/race) due to
shock/vibration loading if not regularly rotating
Many places today where oillite was used in the past now use one of the
engineering plastics like turcite, Rulon, Torlon (and a lot of others)
depending on use. They usually never need lubrication (Oilite should be oiled
occasionally depending on use). The BIGGEST problem with some of these
plastics is COST.
Sigh - as usual, good stuff costs
--
--
Charlie
www.baysidephoto.com
www.thegallos.com
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