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If I have a 4 inch PVC pipe connected to a rotary union, that I want to spin at 200-300 RPM -how do I do it? It appears like the rotary unions themselves have some lateral give -- So, I would need bearings?

Are there rotary unions with built-in motors? Are there motors that can have hollow, 4 inch cores? Does it make sense to get a custom gear machined for this purpose?

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  • $\begingroup$ Protect the pipe and use a flat belt to drive it. $\endgroup$
    – Solar Mike
    Commented Apr 26, 2018 at 6:10

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You can isolate the other side of the rotary union, and use a belt, or magnetic gears. Traditional gears will put lateral stresses on the rotary joint, which may result in buckling.

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