This is one we built more than 20 years ago and had a use for it again. It is just one of those 9.95 Harbor Freight air grinders with a 1/4" collet. We found a swivel base from somewhere and added a steel mounting plate so that the grinder is on center with the lathe. Sometimes you need to get a ground finish on a shaft and this works well for that. We just zip tied the throttle wide open and added an air regulator to the input to control the rpm. We used it many years ago to true up the jaws on an old 3 jaw chuck.

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