Thein Seperator

  • Advertise with us
Project by TDW posted 03-26-2010 04:12 PM 5955 views 29 times favorited 11 comments Add to Favorites Watch

Well I finished the seperator, now I need to get my piping done so I can hook it up. It will go a Cradtsman 2 HP DC.
Notes on building: After I finished the shell I used an old piece of formica to put the inside ring on and the bottom with the 120 degree slot cut in it is from an old desk that I salvaged from the junk yard. I cut a 3/4” grove in the bottom piece and filled it with some left over door insulating strips. Other than time I think I have a grand total of $8 (the 2 connectors are new, the rest of the material was from scaps) in the project. I tried it out for a few minutes just running some flexible hose to the DC and it seemed to work great!

-- Tom, Ky.,

11 comments so far

View PurpLev's profile


8535 posts in 3647 days

#1 posted 03-26-2010 04:21 PM

looks great. nice take on the separator.

how wide is the 120 angle slot? it looks rather narrow – but could just be the picture making it look narrow.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View Jim Jakosh's profile

Jim Jakosh

20483 posts in 3104 days

#2 posted 03-26-2010 04:49 PM

Hey, nice job! A man after my own heart ! Let us all know how it works aout with the DC hooked to it!

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View NBeener's profile


4816 posts in 3173 days

#3 posted 03-26-2010 04:58 PM

Really great looking creation!

May your chips and your fines …. always stay on the right side of the fence :-)

-- -- Neil

View SteveMI's profile


1094 posts in 3293 days

#4 posted 03-26-2010 05:15 PM

Make sure you update this, as I plan to duplicate it soon. I built a “mini” thein with 5 gallon bucket that works great for smaller jobs, shop vac and 1.5” hoses and always had in mind to make a larger one for TS and planer.

Your design looks perfect for TS, planer and my HF 1.5hp DC. I do think the same as puplev that the slot seems too narrow.


View Abbott's profile


2570 posts in 3302 days

#5 posted 03-26-2010 05:23 PM

Way to go Tom, that looks good!

I sure like my Thein, it even catches a lot of the fines.

-- Ohh mann...pancakes and boobies...I'll bet that's what Heaven is like! ♣ ♣ ♣ ♣

View jm82435's profile


1285 posts in 3741 days

#6 posted 03-26-2010 10:04 PM

I will be building one of these soon. Thanks for sharing yours.

-- A thing of beauty is a joy forever...

View John Gray's profile

John Gray

2370 posts in 3884 days

#7 posted 03-27-2010 04:51 PM

Excellent take off on the Thien Separator! I like the use of Formica.

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

View Woodcanuck's profile


128 posts in 2999 days

#8 posted 03-29-2010 07:37 PM

Very nice…I just made one as well, though I put the inlet port directly into the garbage can and drop the lid/baffle right into the can.

Hooked it all up on the weekend and after planing down a bunch of maple, I had a garbage can full of shavings and virtually nothing going through the impeller into the bag.

I like how you’re sits on the garbage can…if this one wears out maybe I’ll try that.

The formica sleeve inside is a great idea for keeping turbulence down.

-- Ian - Life's a game, if you don't play, you can't win.

View NegativeZero's profile


9 posts in 2999 days

#9 posted 04-21-2010 02:12 AM

Great implementation of Phil Thien’s baffle design! I am planning to build a similar separator, but I want to make my sides clear acrylic so you can see the swirling chips and dust, so I am going to have to learn how to thermoform acrylic as part of my build. May not be as slick as formica, but I cannot resist the idea of being able to watch it spin.

What diameter is the inlet fitting? – I am thinking 6”, but I am not sure of the relative sizes of the parts.

Did you consider whether making the separator taller would result in greater separation (more distance for gravity to pull the dust down as it spins around)? I cannot find any consideration of this question.

Have you considered attaching the blower from your DC directly to the top of the separator? I plan to do that to reduce the unnecessary distance of pipe and to increase the inlet size of my blower to 6” (from 5”). Of course, this will mean that the motor, blower and separator will become a single stationary unit, and I will suspend the waste can below it with clamps/bungee cords.

Depending on how good the separation works, I am considering exhausting what comes out of the blower to the outside (I live in a moderate climate and my shop is an unheated separate garage so I am not worried about fresh air being pulled in as the dust is exhausted).

This is everything I can think of to minimize the static pressure drag of a cheap alternative to a cyclone to attach to a low cost DC.

Please keep us updated on your progress on your great project!


View TDW's profile


34 posts in 2983 days

#10 posted 04-23-2010 06:05 PM

I built this one for use on a 1 hp DC so I used 4” connectors. All I will use this one for is floor sweeping or hook up to an individual machine 1 at a time. I plan on building a larger one to hook up to a 2 HP DC to use for my whole shop and I will use 6” for that one. If I were venting outside I would place it on top but (at least in my area) what comes from the seperator is not clean enough to vent outside, so I still want to go into my DC where I have the bags for further filtration. I have ordered some better bags but they are not in yet.
By-The-Way I have been very pleased with the performance of the seperator. I do not have an instrument to measure it but I cannot tell any difference in the “suction” when I put the seperator on and it does a good job of getting the majority of the sawdust out.

For those that asked earlier the slot is 1 3/4 inches The only reason I used that was that it was suggested on the thein site

-- Tom, Ky.,

View NormG's profile


6112 posts in 3003 days

#11 posted 08-23-2013 12:54 AM

Great addition to your dust collection, should be sturdy enough to have to-secure it down

-- Norman - I never never make a mistake, I just change the design.

Have your say...

You must be signed in to post the comments.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics