On Thu, 04 Apr 2013 07:45:57 -0400, Spehro Pefhany
wrote:

On Thu, 4 Apr 2013 02:34:25 -0700 (PDT), the renowned
wrote:

Thanks. I think that LV or needle bearings would not work on this small size. I appreciate the advice against using brass and bronze together. I think I'll go with a delrin sleeve and brass shaft.

Don't do that. Delrin is not strong enough (Pmax = 1000), IMHO.
(disclaimer: IANAME)

I would suggest trying a steel or SS shaft and oil/PTFE impregnated
bronze. Follow the bronze bearing recommendations on the hardness of
the shaft Rb 85+ or whatever it is. Test it at higher than expected
loads. SAE863 (oilite+) is stronger than 841 (Pmax 4,000 vs 2,000)


Which is why I mentioned Igus products in an earlier post. They offer
standard bearings and materials with Pmax from 7500 to 21000 psi.
Prices for a 1/4 x 1/4 x 5/16 bearing run from $.57 to $2.00 at qty
100, depending on material.

--
Ned Simmons