Thien Style cyclone baffle

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Project by bluekingfisher posted 677 days ago 4021 views 17 times favorited 21 comments Add to Favorites Watch

I spent a couple of weekends building this baffle for my dust collection system.

Made from MDF, threaded 10mm stud, 115mm sewerage pipe and 150mm air vent duct for the output hose side. I will hook this up to the 150mm port on the DC rather than use one of the two 100m ports on the plastic spiggot

the Black sewerage pie is 115mm or 4 1/2 ” so I had to make an adaptor to fit the 4” hose. I did this by cutting a 4” section off the end of the black pipe and cut a vertical slice on one sideapprox 3mm wide on the bandsaw. You can see the seam in one of the photographs. When you squeeze it back together it fits snuggly inside the 4 1/2” pipe. It held the seam joint and welded it in place using plumbers plastic pipe weld cement, works great.

It is to fit a 200 litre drum so I hope it works ok when I go to set it all up.

Thanks for looking.


-- No one plans to fail, they just, just fail to plan

21 comments so far

View Don W's profile

Don W

14821 posts in 1192 days

#1 posted 677 days ago

it looks great. It should work like a charm.

-- Master hand plane hoarder. -

View mloy365's profile


432 posts in 1754 days

#2 posted 677 days ago

Impressive! I’ll bet it will work great.

-- Mike - Northern Upper Michigan

View Jim Rowe's profile

Jim Rowe

546 posts in 936 days

#3 posted 677 days ago

Looks like a neat solution. Interesting drilling set up in picture 5.

-- It always looks better when it's finished!

View TopamaxSurvivor's profile


14721 posts in 2300 days

#4 posted 677 days ago

Looks like a work of art! Sure you want to get it dusty?

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View bluekingfisher's profile


1008 posts in 1604 days

#5 posted 677 days ago

Thanks for the input fellahs, I tend to overdo things a little but I’d rather do it right first off rather than have to go back and fix it up sometime later…......I hate that.

-- No one plans to fail, they just, just fail to plan

View exelectrician's profile


1519 posts in 1051 days

#6 posted 677 days ago

You will be happy with that D.C. and your lungs will thank you later on.

-- Love thy neighbour as thyself

View bluekingfisher's profile


1008 posts in 1604 days

#7 posted 677 days ago

I sure hope so exelectrician, I’ve been breathing in too much dust for too long.

-- No one plans to fail, they just, just fail to plan

View kizerpea's profile


746 posts in 991 days

#8 posted 677 days ago

Looks good it works good too…


View Vrtigo1's profile


430 posts in 1615 days

#9 posted 677 days ago

Where did you buy the sewer pipe?

View Bogeyguy's profile


464 posts in 692 days

#10 posted 677 days ago

Will the outlet require a filter???

-- Art, Pittsburgh.

View blackcherry's profile


3153 posts in 2447 days

#11 posted 677 days ago

Welcome to the world of Thein, I’ve had mine now over a year and it just works amazing. It works so well that the trash can started to collapse in the center so I cut out a wooden ring and sealed it to side of the trash can and now it as quite as a church mouse….enjoy the clean surrounding, nice work on your lid….BC

View Rick  Dennington's profile

Rick Dennington

3306 posts in 1818 days

#12 posted 677 days ago

I’ve been meaning to write you, and I owe you a long letter, which I will get to hopefully, soon….We have some catching up to do….I just kind of jump in and out on here when possible…..I’ve been after them elusive fish all spring and summer, and not through yet… Once again, you done good on the d.c. baffle..
If you’ll build me one, and ship it over here, I’ll test it out on mine… See ya….

Great project you built….you said you were gonna do it, and you did….Hope it works like you plan for it to.

-- " I started with nothing, and I've still got most of it left".......

View NormG's profile


4088 posts in 1628 days

#13 posted 676 days ago

Looks well made, I’ve yet to make one. Maybe my work area will look as clean as yours if I did

-- Norman

View TechRedneck's profile


738 posts in 1481 days

#14 posted 676 days ago


Glad to see you have fimally finished it. Give us an update after it is all hooked up.

-- Mike.... West Virginia. "Man is a tool using animal. Without tools he is nothing, with tools he is all.". T Carlyle

View ajosephg's profile


1850 posts in 2185 days

#15 posted 676 days ago

Great workmanship. I didn’t recheck the Thien drawings, but the clocking of your intake pipe doesn’t look quite right. If it doesn’t work properly, that may be the reason.

-- Joe

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