Locate an old variable speed polisher/sander and use your wire wheels on that.
I have an old polisher that I did just that to.
Those grinders spin pretty fast and will wake yer hiney right up when it catches the cord :drunk: . I have also managed to grind divots into various parts of my anatomy----this generally has some sort of painful stoopid idiotlesson attatched to it.
An AC electric motor requires the cooling that is generated at the speed it runs normally. This is achieved by simple cooling fins usually pressed onto the main shaft. If a potentiometer or rheostat is hooked up, "in the hot side of the 110V power wire works easily enough," the time the motor runs at a slower speed needs to be short. Over heating could be checked by physically checking the housing with your hand to feel if it is hot. Normally it will create heat, but if it is to hot to hold your hand on it for more than a few seconds, it is over heating. If you smell a sort of chemical odor emanating from the grinder, the amateur coating is burning and that means it is over heating as well. All of the different size bench grinders I have owned and still use, I have outfitted them with a basic dimmer switch for the interior lights from 24V Diesel application and they still work. Although I have the switch bypassed with another wire with an On-OFF switch for use during normal operation.
Not sure which dimmer switch you are using but you can't just cut down the voltage on an AC motor like you can with a DC and expect to get any service out of it. They will heat up for other reasons than just the fan running slow and if yours are doing ok then you probably are not using the rheostat type dimmer or you you are not using them very hard. The question here was "how can I slow down my electric grinders" and simply cutting down the voltage is a darn good way-- to burn out the motors that is!
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