On Sun, 02 May 2010 19:56:39 -0400, Ecnerwal
wrote:

In article ,
"Michael Koblic" wrote:

"Don Foreman" wrote in message
...

[...]

I am trying to visualize how to get a big plastic bowl to shake at 1700
Hz with a motor cannibalized from a drill press :-)

That'll require some gears. 1700 Hz is 102,000 RPM.

Please explain.

The standard frequency of these vibrating tumblers is either 1700 or 3000
vibrations per second (Hz).

No, it isn't. It might be about 1725 or 3450 orbits per minute, not
second.

1700 Hz is not quite a half-note below the A two octaves above middle
A on the piano, about 200 Hz below the most irritating component of a
baby's cry. If a vibrating tumbler ran at 1700 Hz you couldn't stay
in the same room with it.