You only need a 12gal or so Vacuum for most routers, they will pickup/suck up all the chips and most of the dust because of the air filter in most can vac.systems, most are rated at 1 micron filtration unlike the bag type vac.systems rated at 30 micron the norm, what go's in needs to come out so to speak
You just miss a great deal at HomeDepot and Lowes they had one for $27/$34 on black Fri. but you may want to check with them they still may have one at that price.
I also like to make as much of my shop equipment as I can BUT the DUST COLLECTOR system you will be money ahead to just buy the Vac. and then just add the hose you need and a wireless control for it.(hose from Rockler / Grizzly plus the control unit)
The good bags are not cheap and you will need two of them the norm.
12-Gallon 5 Peak HP Wet/Dry Vacuum, see snapsot below ▼
i have a 5 gal. shop-vac & if i replaced the paper bag in the canister with say a pillow case fastened on inside that this will work. (my wife will like the idea of the pillow case if it will work)
The dryer blower idea will work for collecting the majority of the dust. The filter bag fabric is the important part of this set up. I did a temporay fill in assignment for a company called Filtra Systems and learned more than I ever wanted to know about filtration. Keep in mind that a low end dust collector runs close to $100 so there may be a small trade off in performance for a big cost savings.
A pillowcase will not trap the small (below 30 microns) particles, and these are the ones that cause lung damage. If you already have a 5 gal or bigger ShopVac, then I would recommend three enhancements: (1) The ShopVac HEPA (1 micron) cartridge filter (2) the ShopVac yellow bags (for drywall dust) and (3) mini cyclone lid and 5 gal bucket.
I got my cyclone lid at Woodcraft. Search on "dust collection" or "trash can".
The cyclone will catch all of the visible chips and dust. The bag will catch most airborne dust that gets past the cyclone. And the HEPA filter insures that nothing larger than 1 micron leaves your ShopVac exhaust. The HEPA filter can be tapped or washed clean. Only the bags must be replaced.
You will find a thread about discounted pricing on filter bags and additional small dust collection bags which eliminate the need for the $40 HEPA filter for the shop vac here: http://www.routerforums.com/7316-post1.html
There is also a good thread under General Woodworking that is worth reading.
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