Hi, everyone, it has been a pleasure reading all of the great information on this board, over the last few weeks. Honestly, I still have plenty to read. But not only is the information good, the tone of the board is nice also.
On to the question - I have an old Jet dust collector, rated at 2-1/2 hp, 1200 cfm. It has a 12" impeller with a 6" input fitting. I had it set up for a while years ago, and it worked well despite what I now know were some pretty inefficient home-made junctions and fittings. But of course, it was spewing fine dust throughout the shop.
Due to space and other considerations in my current shop, which is in the basement of a 110 year old house, now is not the time for me to do a full-on, perfect system. I am leaning strongly toward the kind of modifications shown in this thread - http://www.jpthien.com/smf/index.php?topic=145.0
(maybe without the cool paint job, though.) So, a Thien baffle in the bottom of existing "cyclone," cartridge filter above. One of the features of this particular DC is that it has a spiral ramp inside the "cyclone" part, and I am wondering how that might effect the working of the baffle, and if there are any design changes I should make. See picture, below, if it posts.
A specific question I'd have is, would it be worth me making an output tube with a bellmouth on it to feed up into the filter? I'm going to have to make the "donut" to support the filter,so I'd be halfway there, already. And if so, would it make sense to have a bellmouth on both ends of that tube? I don't think that air straighteners in the tube would be worth the time, since I wouldn't be feeding the impeller directly, but you could talk me into them. The "hole" through the inside circumference of the "ramp" is 9", so I could use a 6" pipe in there and have 1-1/2" of clearance on all sides of the tube.
So, thanks, I look forward to any and all replies - Dusty