i did go to the local bearing shop and bought 2 bearings but found that they did not spin very freely, after we rang the guy up about this he said that its like this because of grease and that it wares really quick if it doesnt have the grease or something
so basicly where can i find a good beairng for a 250-500 watt VAWT savenous turbine
There are lots of ways to reduce bearing friction.
I would go with a much smaller shaft and use skateboard bearings, preferably sealed ones. They hold a 150lb guy jumping up and down, so ought to be OK. Lube lightly with graphite.
Bicycle bearings would be cool too. You can again use graphite rather than grease for very low friction. These can take axial load (pushing straight in on the axle), which the skateboard bearings won't do very well. Get some from a junkyard or old bike for free.
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