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Variac and angle grinder

Posted: Tue Jul 04, 2017 2:26 pm
by karatestu
If I plug a240V angle grinder in to a variac and say run it at 110V will the speed be reduced ?

Sometimes I need a bit less speed and there are no speed controls on a bloody angle grinder. :angry-screaming:

Variac and grinder poised.............

Re: Variac and angle grinder

Posted: Tue Jul 04, 2017 2:58 pm
by Dr Bunsen Honeydew
Depends on the motor, some are controlled by the frequency so all voltage drop will do is make the motor overheat. Others may be controlled, but I am not a motor expert.

Re: Variac and angle grinder

Posted: Tue Jul 04, 2017 4:32 pm
by karatestu
Ok, cheers. I will give it a miss then.

Re: Variac and angle grinder

Posted: Tue Jul 04, 2017 6:26 pm
by kimangelis
If you do connect it, the motor will attempt to draw more amps so will burn out. Don't.