Pipe Joint Bearing
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The wind turbine needs some way to rotate to face the wind. That's where a bearing becomes necessary. I used a 1 1/4" pipe junction as a bearing. Since the tower I built was also made out of 1 1/4" pipe, it fit in perfectly to the design.

Pipe junctions generally look like this. The top piece is threaded, while the bottom is smooth, allowing it to rotate.


This is what it looks like disassembeled. Note that the piece on the right is rotated from how it would be when the junction is put together.


The curved surface is what the turbine will rotate on. This isn't the best bearing, but it will work. Before gluing the piece together, it's a good idea to lubricate this surface. WD-40 works great, as does graphite.


Mix up some JB weld for the threaded piece


You want to cover the threads with JB weld. This will create a really good connection that is essentially unbreakable. The trick is to screw in this piece so that it is tight, but not all the way in. If it is screwed all the way in, then the other piece will not rotate, but if it is too loose, then the bearing will not be stable enough, and the turbine will shake violently. Practice without JB Weld so you know how far to screw it in.


This is what the final bearing should look like. If it feels too loose, it is definitely better in the long run to make another. I know from experience that a loose bearing can be frightening in high winds!




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