Reply by bigblockyeti

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Posted on Keyed pulley, smooth shaft??

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5776 posts in 2136 days

#1 posted 08-29-2016 08:16 PM

It is very (very) unlikely you will need to upgrade the bearings on that motor to handle the radial load that a belt drive will subject them to. While the original design generated little radial force, manufacturers don’t go out of their way to install smaller bearings until you start dealing with large motors, not consumer stuff. Grinding a flat on the side might not be ideal, but it will work and reliably for a long time if the pulley fits the shaft well.

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