Reply by BlankMan

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Posted on HF Dust collection question

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1490 posts in 3353 days

#1 posted 03-24-2012 05:46 PM

5” ducting isn’t that hard to find, maybe locally it is. All my main trunks are 5” and only drop to 4” right close to the machines. With the exception of the table saw, that has 5” all the way to it. Long 5” runs are way better then long 4” runs. I got all my piping, 5” and 4” from Oneida. This was my 4th iteration of dust collection, shop vac and Craftsman 2-1/2” piping, 1HP dust collector and 4” PVC, Delta 1-1/2HP 1200 CFM dust collector and 4” PVC, and finally Oneida cyclone and 5” metal piping. Four times was enough, was not going to do it five times so this time I did it right.

Read all I could get my hands on on the subject, even industrial level design books. Leveraged Oneida’s engineers who convinced me not to go with 6” main trunks even though the cyclone’s inlet was 6”, definitely do not go with 4” main trunks, go with 5” mains trunks. I listened and was sure glad I did.

I have a Dwyer digital manometer and while designing and installing the plumbing used it with pitot tube to determine air flow velocity, CFM, static pressure, etc. so as to optimize it. As I said I wasn’t going to do it again.

I have a gauge connected permanently to the main trunk close to the cyclones inlet that measures static pressure and keep an eye on it telling me performance. I took measurements with it when everything was clean so I know what it should be reading for each machine thus any deviation could indicate reduced performance. Planning on and have a gauge to put on the exhaust right before the big filter that will indicate air pressure there, when the reading increases, time to clean the filter.

My point being, don’t skimp, do it the best you can the first time so you’re satisfied with it and won’t have to do it again like I did. But I will say, when I started this dust collecting thing nearly 20 years ago the options then weren’t anywhere near what they are today. You couldn’t even buy a dust collector locally like today and selection was extremely limited. So that in part fostered some of my iterations, but I eventually got there and don’t have to clean out machines like the Unisaw’s cabinet any more. Not at all. And that was my goal.

Can you tell, I hate cleaning up sawdust…

-- -Curt, Milwaukee, WI

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