Vibration Making: How Sander Mechanism Works

[mystiqus]

I interest how can vibration be maked.That is,for example sander.how does the mechanism of the vibration sander functions?is there any idea?

 

[Astronuc]

Vibration is a period mechanical motion, i.e. some mass is translated back and forth over a given displacement field. Such motion can be obtain with a linear or rotational (orbital) electric motors, which produces a periodic motion.

Piezoelectrics can also produce vibration by turning the electric field on and off periodically. See -
http://en.wikipedia.org/wiki/Piezoelectric_effect
http://en.wikipedia.org/wiki/Piezoelectric_transducer

Piezoelectric transducers are the basis of ultrasonic devices.