Need some help with knowing what type of bearings to use. I am trying to build a wind sculpture that will have a central fixed shaft (maybe 6-8' of nominal 1" O.D. steel pipe sunk in concrete perpendicular to the ground). Above a bottom non-rotating 4' base sleeve over the shaft, Iíll slide on separate lengths of sleeves of 1.5" nominal O.D. steel pipe over the vertical shaft. The balanced outriggers welded to the sleeves will have various shaped Ďcatchersí for the wind. The sleeves turn in opposite directions. I live where the wind really blows.
So there is my problem: there has to be ? a bearing or a bushing at the bottom of each sleeve to allow the sleeves to turn this way and that. I looked in the McMaster-Carr catalog (www.mcmaster.com) and wow are there a lot of bearings. The load is down/perpendicular, so a Thrust bearing? How about that ultra slippery plastic/nylon/PTFE as a bushing or a flanged sleeve? One fellow told me he used radial ball bearings, but I canít figure that out because the load is not radial. The weight would rest on the journal? Any ideas are appreciated. This is the heavy duty version of those copper wind sculptures you see turning at the garden shoppees .
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