I don't think my shake table design would work well for low amplitudes
and low frequencies.  It's good for shaking down model buildings and
things like that.

How about using a piezoelectric crystal under the edge of a
stiff board.  A low frequency electrical signal would drive the
crystal.

Cheers,
John

At 09:46 AM 2/11/2002, you wrote:
>One of the cheapest shake tables I've seen involves a couple of small sheets
>of plywood (one for the base and one for the actual table), 2-aluminum rods,
>2-aluminum pipes, a crankshaft made of a length of wire hanger, and finally
>a variable speed drill.  It works great for kids/displays at school.  If I'm
>not mistaken this was put together by John Lahr and is(was) shown on his
>website.

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