I've two Vibro Graver electric engravers (120V 60Hz) with me. I gave one to a friend who recently moved to another country. He got a step down converter from 220V to 110V but then he noticed the frequency used there is 50Hz.
What would the effects of using the device on a 110V 50Hz supply when the device is meant to be used on 120V 60Hz supply. Does the 10Hz difference cause any damage?
Edit: The voltage is stepped down from 220V 50Hz to 110V 50Hz Img 1
Answer
There are two reasons you may have trouble.
50Hz into 60Hz-designed inductors can always be a problem, depending on how conservatively the original 60Hz design was with respect to saturation. If saturation is more than 20% away at 60Hz, then you'll get away with it at 50Hz. If closer, then the core could saturate, drawing many times more current. You can avoid this by transforming the voltage down to 83% of the rated voltage, so 100v, but of course this will reduce the power available.
Vibratory motors will often use a mechanical resonance between the mass of the armature and the compliance of the spring used to support it, to make up for the poor efficiency of that type of motor. If that's the case with this one, then the 50/60 difference could render it completely ineffective. Try it and see.
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