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I have been messing about with a 20k RPM spindle motor and want to try to have some more low end torque. I was thinking about using a belt or chain CVT so I can smoothly change gear ratios but is there any issues with using a CVT at those kinds of RPMs?

If I can find good enough bearings the idea of having a high end option of 40k rpm is appealing if the CVT can handle it.

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Belt drives as used in CVT systems (snowmobiles, for example) generally have operating limits placed on their linear speed (in feet per second) by the belt manufacturer. Knowing what that will be for your application then lets you search for a belt that will work.

For dividing down the speed of a shaft running at 20,000 RPM or more, specially-designed gear drives are commonly used. You would be better off first gearing down the spindle to get a more manageable RPM setpoint and connecting that reduction drive to a belt-style CVT.

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