This is take #2 on my dust collection ductwork install. Here is the link to my initial blog on this project: “DC-Take #1” http://lumberjocks.com/jocks/Lenny/blog/7465. First, a recap. The space I chose to locate my dust collector (DC) left it in the middle of the 6” ductwork, which I installed at ceiling level. This meant I needed a joint (fitting) that allowed the two sides to meet and enter the separator and DC. I couldn’t find an appropriate 6” fitting but found a 4” double tee so I had to reduce the system before it entered the separator.
Woodchuck and Purplev suggested using a 6×6x6 wye fitting installed vertically instead of horizontally (something I hadn’t thought of) with one 45 degree fitting needed at the top of the pipe coming out of the wye, and two 45s coming out of the top. These connections brought me to the main trunks.
Bob#2 suggested that while doing all this revamp work; I might as well install a couple of blast gates to zone the system in two. Initially I did not want to do this, thinking that for my small shop I didn’t need the extra efficiency this would afford. The more I thought about it though, as Bob said, I would be making the changes noted above, so now was the time to do it. Woodchuck and Purplev, as strong proponents of the least amount of air restriction possible, I think you will be pleased to learn that I purchased blast gates from ClearVue that are installed on the OUTSIDE of the pipe! They fit quite nicely. Blast gates of course raise an issue regarding the ground wire. With a blast gate, your ground wire has to exit the pipe, go around the blast gate and then re-enter the pipe. No big deal, but another thing to consider as I did the revamp.
On my initial install, I brought the ductwork into the trash can, right in the center of the can. Woodchuck and John Gray were a big help in helping me redesign this. I elongated the hole so that the (now) 6” pipe enters the can at a sharp angle such that it is running along the inside of the can. This will help create the cyclone effect needed for the separator to be effective.
My DC has a 5” flange just before the impeller. I needed something 5” coming out of the can that I could join to the flange with a short length of 5” flexible hose. I purchased a 5” hose connector from Grizzly. The picture on their site led me to believe that its length would be about 7”. Upon receipt, I learned it is only about 5” long, i.e., it is only as long as it is wide.
Some of this sits above the lid and accepts the 5” flexible hose. The rest extends below the lid, into the trash can, but only about 2 inches. This model DC came with a Y fitting to connect flexible hose to the DC. It has a 5” top that connects to the flange and has two 4” legs so you can connect one or two flexible hoses. Since I would not be using this fitting, I sawed off the 4” legs, leaving me with just the 5” top at a length of about 4 inches. On the underside of the lid, I slid this over the hose connector and connected it permanently with a couple of screws. This extends the entire piece into the can about 6 inches.
Below is a picture of the inside of the separator after I ran a piece of pine through my thickness planer, making pretty aggressive cuts. I think just about all that was cut from the pine board ended up in the trash can; so it appears to be working as it should.
Lastly, the flange just before the impeller has a crisscross of metal that I imagine Delta puts there as a safety feature to prevent larger objects such as a small tool from reaching the impeller.
The thing is, I feel it substantially restricts air flow. My use of this system will involve attaching one end of a flexible hose to a machine and the other end to one of four drops. As such, the only thing going through the system will be woodchips and dust. I did not include a floor drop into which I can sweep debris and I plan to continue using a shop vac for workbench, floor and other cleanup activities. Are you folks okay with my having removed those metal “crosshairs” or do you think they should have stayed? Thanks for stopping by and thanks again to Woodchuck, Purplev, Bob#2 and John Gray for helping me improve this system.
-- On the eighth day God was back in His woodworking shop! Lenny, East Providence, RI