Flexible Couplings OK for Sewer Drain Usage?

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I noticed recently, that one side of my X gantry was not raising at the same time as the other. Upon closer inspection, one of the screws was not inserted all the way making the coupling more flexible, and less rigid. Backlash was created as the spring had to take up slack, and then it could turn the screw. This is not as much of a problem if the screw is constantly under tension, and you can guarantee each coupler is taking up backlash in the same manner (two Z motor set up). But obviously knowing the amount of backlash is difficult, and setting up each coupler in the same manner to give the same backlash may give problems. Even if the screws are set up well, the spring design of the coupler will always have backlash.

You could use rigid couplers, but I have heard of these causing motor shafts to split or become damaged over time. What other coupler are available, how do others set up there Z-axis for less backlash? I'm in the process of setting up a single Z motor set up for mine, but my last design had issues with mounting the screws. This was a minor problem, but I reverted back so I could have a running printer until I could design and implement a better mount.

Either way, what are the options for a good Z screw mount to a nema 17 with no backlash (within reason of course)?

So I use a fairly 'standard' 5mm to 8mm flexible coupler, much like this - [ www.ebay.co.uk I noticed recently, that one side of my X gantry was not raising at the same time as the other. Upon closer inspection, one of the screws was not inserted all the way making the coupling more flexible, and less rigid. Backlash was created as the spring had to take up slack, and then it could turn the screw. This is not as much of a problem if the screw is constantly under tension, and you can guarantee each coupler is taking up backlash in the same manner (two Z motor set up). But obviously knowing the amount of backlash is difficult, and setting up each coupler in the same manner to give the same backlash may give problems. Even if the screws are set up well, the spring design of the coupler will always have backlash.You could use rigid couplers, but I have heard of these causing motor shafts to split or become damaged over time. What other coupler are available, how do others set up there Z-axis for less backlash? I'm in the process of setting up a single Z motor set up for mine, but my last design had issues with mounting the screws. This was a minor problem, but I reverted back so I could have a running printer until I could design and implement a better mount.Either way, what are the options for a good Z screw mount to a nema 17 with no backlash (within reason of course)?

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