"george (dicegeorge)" writes:

somewhere on this newsgroup was mention of a vortex
vacuum bucket thingy to get lumps of grit before the vacuum cleaner,
where was it?

Can't be bothered to do a google groups search, but these pages describe
some home made http://codesmiths.com/shed/workshop/techniques/cyclones/

I made one myself out of an old spin-dryer. I keep meaning to write it
up and post it here.

--
Jón Fairbairn
http://www.chaos.org.uk/~jf/Stuff-I-dont-want.html (updated 2009-01-31)