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Re: 80/20 sliders
Slightly more friction than other methods but definitely cheaper: We discovered this week that #35 chain can be "threaded" between two pieces of 8020, and can provide a rather smooth movement between them. We're investigating using a 4' tall piece of 8020 as the lifter track, and mounting a 1' long piece of 8020 to the chain, which would serve as the mount for the tube handler. By looping the chain around a pair of sprockets, we can pull the chain and move the mount almost 4' up or down.
Picture will follow if it works.
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