On 1/15/2010 3:33 PM, Leon wrote:
wrote in message
...

That would probably depend on the filter in the vacuum. Typically the
cyclone type separators simply separate the large debris from the fine
dust.
The fine dust is usually captured by a different filter.

Not accurate. I had some very fine saw dust in the bucket in my
review. Almost no sawdust ended up in the shop vac or attached to
the filter.

Fine dust normally does not take up much space, it compacts well. Would'nt
that be what you actually did find in your shop vac?

That would seem to be a reasonable guess, but I've been using a pair of
cyclone separators in series for almost eight years now - see

http://www.iedu.com/DeSoto/Misc/dustcoll.gif

for a photo - to collect dust from the CNC router with results that you
might find surprising: the first barrel traps all of the coarse stuff,
and the second barrel traps the /really/ fine stuff.

The surprising part is that the DC has _never_ been emptied and that
there is more dust on the outside of the bags than inside...

....and the main reason for the dust on the outside of the bag is that I
sometimes forget (but only for a very short while) to turn on the DC. )

--
Morris Dovey
DeSoto Solar
DeSoto, Iowa USA
http://www.iedu.com/DeSoto/