Fernando, if you’re looking for an expensive impact machine, the
Japanese Crafts Master (approx… $3,000) makes an excellent
ultra-sonic engraving and stone setter. It is small,compact and
light-weight in comparison to the compressor type machines. They make
it in a 115 volt and a 220 volt model. Aside from engraving and stone
setting, it can compress and burnish pin holes, it will also polish
the undersides of jewelry that are difficult to polish in the normal
manner. Min Azama in Tokyo.