2nd Hand Cyclone

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Blog entry by DocK16 posted 07-17-2008 04:21 AM 1158 reads 0 times favorited 11 comments Add to Favorites Watch

I’m always scowering the want ads, classifieds, and flea markets for bargains. I have always wanted a central cyclone system for the shop but at at $1000 plus they have always been out of my price range so when I saw this in the local bulletin board at less than 300 I snatched it up. Now I’m finding that 6 inch duct work including Y’s and elbows costs 3x what 4 inch costs. Kinda like 8 inch jointers costing twice much as a 6 inch. So I’m asking LJ’s for any leads on cheap duct work or any advice on setting up a 6 inch system.

-- Common sense is so rare anymore when you do see it, it looks like pure genius.

11 comments so far

View Greg Wurst's profile

Greg Wurst

794 posts in 3860 days

#1 posted 07-17-2008 04:25 AM

I’d just use a 6” to 4” reducer at the vacuum and go from there.

-- You're a unique and special person, just like everyone else.

View lew's profile


12102 posts in 3783 days

#2 posted 07-17-2008 04:26 AM

Of course you were wearing a mask when you picked it up!

Nice Snag


-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View DocK16's profile


1184 posts in 4115 days

#3 posted 07-17-2008 04:31 AM

Manufacturer recommends keeping the main trunk lilne at 6 inches and put reducers and blast gates as close to the machine as possible.

-- Common sense is so rare anymore when you do see it, it looks like pure genius.

View tenontim's profile


2131 posts in 3772 days

#4 posted 07-17-2008 04:42 AM

Choking that down to 4” might burn out the motor. You might have to go with 6” pvc and ground the duct work. I’m sure this thing will run enough velocity through the duct to cause some considerable static.

View tooldad's profile


660 posts in 3743 days

#5 posted 07-17-2008 04:58 AM

From my understanding of dust collection, the manufacturer is correct. Dust collectors work opposite of shop vacs. It takes volume to move the dust. In fact the other day we were cleaning up a pile on the floor and our clear flex hose was about half cloged where it had about a 90degree bend. Actually quit sucking even though it was half clogged.

I got my stuff on ebay, used standard hvac elbows and taped the seams with duct tape. did have to bite and buy the Wye’s and shutoffs. I placed shutoffs as close to the dust collector as possible to concentrate on which tool I am using. I have an 8” main trunk, down to 6” above each tool, then 4-6 reducer just before tool so I can use 4” shutoffs at tools and flex pipe. However there are 6” shutoffs where the branches break apart.

PVC creates a lot of static, make sure you use a grounding wire. I have never heard of it exploding but that is what they claim. It is more so that the static electricity when you are near a plastic pipe is annoying to me.

View John Gray's profile

John Gray

2370 posts in 3914 days

#6 posted 07-17-2008 05:07 AM

Read this book – Woodshop Dust Control: A Complete Guide to Setting Up Your Own System: Completely Revised and Updated. Sandor Nagyszalanczy (Author). The information is excellent and accurate. Spend a few bucks here and save a lot of headaches with sizing and installation. It’s available on Amazon.

-- Only the Shadow knows....................

View sIKE's profile


1271 posts in 3782 days

#7 posted 07-17-2008 05:13 AM

Nice find, and yeah when I have done research the 6” stuff is pretty pricey. The Lowe’s here carries 6” PVC and has the 90/45/Wye/T’s for it, but blast gates and double Wyes are a different story of course. Every once in a while my local Woodcraft has 6” blast gates. Hope this helps.

I did some 4” PVC runs behind my Miter Bench project here the blog on it.

-- //FC - Round Rock, TX - "Experience is what you get just after you need it"

View steveosshop's profile


230 posts in 3654 days

#8 posted 07-17-2008 05:14 AM

Nice grab on the dust collection system. You may want to go to the local hardware stores and see if they have any 6” pvc/mainline pipe that they have an end broke or something. Contractors will not buy these pieces and sometimes you can get them for pennies on the dollar. I used to work at a hardware store so I know they can sometimes have the strangest stuff they will get rid of for practically nothing if it has even the slightest cosmetic flaws. Good luck!

-- Steve-o

View Dan Pleska's profile

Dan Pleska

142 posts in 3989 days

#9 posted 07-17-2008 05:17 AM

Hi Dock! What a deal on the cyclone. Those manufacturer recommendations sound right on to me. I bit the bullet and used 26 ga. spiral duct for mine (not cheap) and my trunk line is 8.” I definitely wouldn’t use the light weight duct they use for HVAC that snaps together along it’s length. It may collapse if you forget to open a blast gate before turning on the cyclone. I’m sure there is something in between. I’ll ask around. Your welcome to come down and look at my system. I’ll help you design your system if you want. I designed mine. I didn’t like what Onieda designed.

-- Dan, West Virginia,

View DocK16's profile


1184 posts in 4115 days

#10 posted 07-17-2008 05:38 AM

Thanks for the link John maybe I’ll read the directions first this time. Appreciate the offer Dan I may be contacting you. Oh yeah I got an E-Mail from WoodCraft, they closed their store in Pittsburgh, I guess I’ll be driving to Parkersburg for my WoodCraft supplies.

-- Common sense is so rare anymore when you do see it, it looks like pure genius.

View John Ormsby's profile

John Ormsby

1288 posts in 3765 days

#11 posted 07-17-2008 05:47 AM

You can also get some invaluable info at the Clearvue cyclones site.
It is very important to make your 6” runs all the way to each machine and neck down from their if needed. It would be best to add enough opening with a 6” gate from the machine or 2 smaller gates to get the equivalent of 6”. This way, the dust collector will run at it’s true potential and pick up the fine particulates.

-- Oldworld, Fair Oaks, Ca

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