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Tool Talk Discussion Forum

Dimmer/Grinder question

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James in North

08-30-2004 08:27:26




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Would it be possible to run a bench grinder off a dimmer switch so I could reduce the rpm"s? Thanks. James




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James in North Carolina

09-03-2004 20:43:13




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 Thanks for the help guys. in reply to James in North Carolina, 08-30-2004 08:27:26  
N.M.



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TheRealRon

08-31-2004 03:31:27




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 Re: Dimmer/Grinder question in reply to James in North Carolina, 08-30-2004 08:27:26  
You can't, and even if you could, you would not want to. Here's why: grinding wheels are made to be used at a certain rpm. Too fast and they fly apart, too slow and they cut poorly so the operator tends to force the work into the wheel which will also cause them to fly apart.



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Zane(WA)

08-30-2004 19:46:14




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 Re: Dimmer/Grinder question in reply to James in North Carolina, 08-30-2004 08:27:26  
A local tool repair shop should be able to match up a controller if you can supply them with everything from the nameplate on the motor. As Buickanddeere mentioned, all a household dimmer switch will do is let the smoke out of the wires. ---My dad found out the hard way, burned up his table saw, he did.



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MarkB_MI

08-30-2004 19:32:40




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 Re: Dimmer/Grinder question in reply to James in North Carolina, 08-30-2004 08:27:26  
In a word, no. Not unless it has a brushes in the motor, which would make it an AC/DC motor.



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buickanddeere

08-30-2004 12:02:59




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 Re: Dimmer/Grinder question in reply to James in North Carolina, 08-30-2004 08:27:26  
An AC that is a "series universal" which is equiped with brushes. Such as drills,saws and hand held grinders. Can be run off a HD dimmer but why bother. The bench grinder and another favorite dimmer project furnace fan motors are AC induction motors. Speed is controlled by frequency not voltage/current. Short of a variable frequency drive from e-bay etc. Or running from your home generator at reducued rpm and plugging the grinder into it. No go, you'll "let the smoke out of the wires" and it will never run again.

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Davis In SC

08-30-2004 09:47:52




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 Re: Dimmer/Grinder question in reply to James in North Carolina, 08-30-2004 08:27:26  
Would probably burn out the motor due to low voltage/increased amp draw. I doubt if dimmer switch would handle enough current either.



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tech4

08-30-2004 09:16:26




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 Re: Dimmer/Grinder question in reply to James in North Carolina, 08-30-2004 08:27:26  
Probably not if the motor is a synchronous motor as the frequency of the power effects speed not voltage.



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