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There are quite a few Telstra solar panel tracking systems which rotate panels mounted on a circular ring on rollers. The ring is of flat steel, and the drive system is of commercial 6B British Standard chain, about $18.00 for a 10 foot length (box)with joiner. This is tack welded to the ring at spaces over the 10' length. The drive sprocket is about $5.50, depending on the dia you wish to use. And they use the good old 12v wiper motor for a drive unit, pivot mounted with a spring tensioner to swing into the chain which is fixed to the ring. It's cheap, effective and readily available at any bearing centre, and some of these units are still operating in remote areas after 22 years.
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