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Dome rotation
I used 75mm aluminium V belt pulleys with bearings inserted with an 8mm centre. They were mounted in rectangular stainless steel section which had down holes for 8mm bolts. These holes were oversize to allow fine adjustment. The dome has a 3500 mm diameter ring of 50 mm X 50 mm steel angle (bent professionally). The bolts to attach the pulleys are sunk into the wooden ring foundation by drilling 6.5 mm holes, partially filling with resin, locking two nuts as a driver and bolting them into the base ring. The dome turns very easily but the wind does not manage to move it. There are six pulleys supporting the dome. Bit of a weird shape but works a charm!
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