I run 4" wheels on a Makita 1/2" drill and sometimes stack two wheels together. It's right on the edge of not having enough "oomph" when I really go to town with the sisal wheel, but so far it's doing the trick.
I'm sure I'll be replacing the output bearing on the drill soon as I doubt Makita figured on extreme side loads for extended periods of time when they designed it.
Wish I had a 1hp buffer with some seriously long shafts tho...
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