My original shop went under 7' of salt water in New Orleans last year during Katrina. I am now setting up a new one on high ground in Dallas, TX.
I have a 20" Powermatic and a Orinda 2 HP Dust Gorilla. I am presently running the duct work. What kind of shop made collection device should I use and where should it be located?
For those of you who answered my post about wood face plates - many thanks. I finally resorted to the telephone and found that the search string had to be:
1-1/4-8, not 1.25 x 8 tpi or some variation on this theme.
at my lathe, but that is -NOT- enough. I also wear a full-face sheild/dust mast (Trend), when I was roughing (NOT sanding) a Pauduk bowl, the pre-filter looked like this
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. I also use a whole shop air-filter (that hangs from the ceiling)
Paul, I've been using a shop-built whole-shop air cleaner for a little over 9 months. I replaced the filters last week at a cost of about $60. In those 9 months, I've only needed to vacuum the shop shelves once. The floor gets it 4-5 times a week ... sometimes 2-3 times in the day. Obviously the shop does not stand idle long.
I had some dunnage plywood that was 40x40. I used that for the front and rear of a plenum box. This box houses a furnace fan feeding off (2) 800 Sq inch filter stacks (20 x 20 filters taped edgewise for a 40 x 20 assembly). Each stack consists of a regular household filter followed by a 5 micron filter followed by a .3 micron filter. The sides of the box are open with braces to keep the filters from being sucked in. The filters are held in place by the suction generated. The fan output generates quite a breeze along the floor. I would guesstimate that my shop air is being filtered roughly 3-4 times a minute. Big dust drops where it is made, the fine stuff heads back along the sidewalls toward the intake filters on the air cleaner. The bags for the DC are in the return stream and closer to the air cleaner than I am.
Modify this general scheme to suit the available material and I think you'll find that you have more than adequate ambient air filtration.
Ralph made a good point ... don't rely on a single method to provide safe air. Use a respirator, point of origin dust / chip collection and a good sized ambient air filter. Above all else ... wear that respirator and test the seal.
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