A few weeks ago, Pickering woodworker told me he was going to pick up a a cyclone at the Oneida plant in Syracuse, N.Y. I'de been considering their mini version, " Dust Deputy" for a while, having seen a few reviews.
The purpose of this little device is to limit the fine dust that is sucked into your shop vac and clogs the filter or is blown back out into the air. This baby is all of 12" tall and sits on a 5 gal pail, 1 port in from the source and 1 to your shop vac. Today I did a couple of hours of sanding on my new Rigid spindle/belt sander and thought I should hook up and test the new device. Those of you who have these sanders know they can produce a lot of fine dust using a 120 grit belt, and they have quite a good dust collection system. Using my older but fairly powerful Craftsman shop vac, the 'deputy' intercepted virtually 100% of the sanding dust (about 8 cups worth), no perceptable dust landed at the filter or was trapped in the canister of the shop vac. The ports in and out of the cyclone seem to permit sufficient air flow that there isn't any more draw on the motor than if I had connected the vac directly to the sander. This is a pretty impressive performer.
For any of you who have in-house shops and/ or want very good dust control on your smaller power tools, this is worth consideration. At $129 US it's definitely pricey and it does a very good job. Someone mentioned to me that they are excellent for drywall dust as well.
No connections with Oneida (wish I did), just a satisfied customer.