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Yes the dome driver uses relays, what I mentioned before can still happen with relays, it is not a current problem, but a short circuit. Attached is a pic of another system that I made by wiring in relays instead of the pcb.
The drive I am planning to use is a steel reinforced rubber belt, like a timing belt but used in high end sectional garage doors operators, attached to the inside of the dome. I have a drive cog for it already. It will not slip. I have the same setup driving my roll off atm, it would be very easy to use in your setup, it simply could be glued/stapled to a circular inside face in your dome.
Dont be too concerned about the wheels, it is almost impossible to get that many wheels to face upto the dome, afaik most manufacturers use 3 fixed wheels and 3 sprung wheels to keep them toucing the ring.
Brett
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