Searching for ultra low friction bearing with 5/16" bore
Searching for ultra low friction bearing with 5/16" bore
(OP)
Does anyone know where I can find a relatively inexpensive ulta-low friction ball bearing with 5/16" bore. My application demands really low friction under 10 rpm, room temperature environment. I have tried a skateboard bearing called Bones, Swiss Ceramic @ $15.00 each. The bearing is ok but my competitors are using bearings that have a 'rolling duration' of almost double the Bones bearing lubed lightly with triflo. It was suggested in another forum that I try using a self aligning bearing. Any additional suggestions or opinions?





RE: Searching for ultra low friction bearing with 5/16" bore
RE: Searching for ultra low friction bearing with 5/16" bore
RE: Searching for ultra low friction bearing with 5/16" bore
RE: Searching for ultra low friction bearing with 5/16" bore
RE: Searching for ultra low friction bearing with 5/16" bore
For your application I would suggest a standard deep groove ball bearing of the correct load rating, shields on both sides with a light grease, or without shields with a light oil. 628ZZ for example or its imperial equivalent. If load is minimal, go for the smallest section bearing possible (or maybe the heaviest, to act as a flywheel????) A cylindrical roller bearing will have a higher friction.
RE: Searching for ultra low friction bearing with 5/16" bore
You recommend without shields with light oil. I assume that shields add drag? Also, do have any thoughts on using a self aligning bearing. Will the double row of bearing balls add or reduce friction?
RE: Searching for ultra low friction bearing with 5/16" bore
RE: Searching for ultra low friction bearing with 5/16" bore
Also, the pasted quote below was on skf.com bearing site.
"Additionally, the self-aligning ball bearing has the lowest friction of all rolling bearings, which enables it to run cooler even at high speeds." That seems counter intuitive because more bearing balls means more friction. But maybe the increased # of balls spreads the bearing load of more point contacts?
RE: Searching for ultra low friction bearing with 5/16" bore
You can get full complement bearings that have more rolling elements and no cage, but the friction could be higher then the standard bearing.
RE: Searching for ultra low friction bearing with 5/16" bore
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I'm amazed that cylindricals have a lower friction coefficient compared to deep groove ball bearings. Wonder why?
RE: Searching for ultra low friction bearing with 5/16" bore
RE: Searching for ultra low friction bearing with 5/16" bore
Russell Giuliano
RE: Searching for ultra low friction bearing with 5/16" bore
I see on Boca's web site 2 possible 608 bearings:Ultra Seal or Ceramic Premium. Do you have a recommedation for a bearing with the least amount of friction at 5-8 rpm?
RE: Searching for ultra low friction bearing with 5/16" bore
http://www.dynaroll.com/torque.asp
RE: Searching for ultra low friction bearing with 5/16" bore
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