my Thein Dust Collector

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Project by John_G posted 03-21-2011 02:14 PM 6390 views 28 times favorited 12 comments Add to Favorites Watch

So i decided to finally build my Thien Dust Collector. I have to say this thing work un-believable….. The only picture i’m missing is with the reveal cut out of the lower baffle. Lets just say i took the bottom baffle, measure the circumfrance, divided by 3 and i started right at the mouth of the inlet pipe and measure 1/3 around, then next 2/3 (which returns you back to the opening of the inlet) were cut back 1.25”. I took the shop vac apart and cleaned it since it’s about 8 years old and never been cleaned. I put a new filter in it and it SUCKS!!! i will begin to crush the steel garbage can if you block to much of the suction. I vac’d up a ton of sawdust from plywood, mdf, hardboard, and then opened the shopvac, and the filter was still pure white. PERFECT…. How did i live w/o one of these before…...

-- John Gray

12 comments so far

View chrisstef's profile


17426 posts in 3032 days

#1 posted 03-21-2011 02:43 PM

I have had the plans to make one of these seperators for almost a year now and i still havent gotten off my ass and made one yet. Yours looks like it turned out great, i dig the viewing hole through the side of the can .. slick idea.

-- Its not a crack, its a casting imperfection.

View StumpyNubs's profile


7600 posts in 2826 days

#2 posted 03-21-2011 02:48 PM

I have one of the trashcan cyclone lids and, while it works ok, it suffers from poor design. The Thien Cyclone is so much better. I have one on my to do list. Great work!

-- Subscribe to "Stumpy Nubs Woodworking Journal"- One of the crafts' most unique publications:

View Paul Pomerleau's profile

Paul Pomerleau

309 posts in 2719 days

#3 posted 03-21-2011 03:04 PM

I just finished mine and I love it, I even have a video on how to cut the baffle.
I love your viewing port – Excellent idea !!
Congratulations on a great job.

-- Close to Ottawa Ontario Canada

View steliart's profile


2700 posts in 2714 days

#4 posted 03-21-2011 05:36 PM

very nice work. i like it.

-- Stelios L.A. Stavrinides: - I am not so rich to buy cheap tools, but... necessity is the mother of all inventions

View ChunkyC's profile


856 posts in 3280 days

#5 posted 03-21-2011 07:14 PM

I have a “viewing port” on mine too. It’s the bag on the DC. When I get chips in the bag, it’s time to dump the barrel. I’m curious as to how well the widow works for you. My thoughts would be that dust would stick to it because of the static electricity rendering it useless. Also, my chips tend to pile up all on one side. so it may look have empty yet still be passing chips on through the DC fan. I would love one on mine if they work.

-- Chunk's Workshop pictures:

View AaronK's profile (online now)


1506 posts in 3490 days

#6 posted 03-21-2011 07:35 PM

nice work!

how did you ensure a tight seal between the lid and metal can?

View John_G's profile


165 posts in 2717 days

#7 posted 03-21-2011 10:50 PM

@ChunkyC: so far testing it i haven’t had anything stick to it, time will tell more i guess.

@AaronK: The lid is just sitting on the can with a snug fit. I debated some sort of weather stripping but decided against the when it fit so snug. And with the can wanting to collapse so easily i think i have a nice airtight seal…..

-- John Gray

View AaronK's profile (online now)


1506 posts in 3490 days

#8 posted 03-22-2011 03:47 PM

wow thats a pretty good seal then! thanks!

View Roger's profile


20929 posts in 2830 days

#9 posted 03-23-2011 01:54 AM

great idea, with deluxe engineering. very nice

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed.

View thelt's profile


665 posts in 3405 days

#10 posted 03-24-2011 01:50 PM

@Paul Pomerleau – Would love to have the plans to your circle cutting jig. I have yet to make one and your’s seems to be just the ticket. Maybe another Video on how to build it. Thanks

@John_G. – Very nice and when it starts to collapse the can you know your seal is good.

-- When asked what I did to make life worthwhile in my lifetime....I can respond with a great deal of pride and satisfaction, "I served a career in the United States Navy."

View Phil277's profile


183 posts in 2349 days

#11 posted 01-28-2012 03:46 PM

I’ve made a couple of the Thein Collectors; a small one with a 5 gallon bucket for my shopvac and a 55 gallon drum version for my shop dust collector. They work great. Your filter doesn’t need to be cleaned very often when you have one of these.


-- The main thing is to keep the main thing the main thing. From a sign on a surfer bar in So. Calif.

View ortega5629's profile


7 posts in 2357 days

#12 posted 02-01-2012 04:38 AM

This will be my next project. the only thing i am considering differently is to use my elec leaf blower vac instead of my 12 gallon shop vac. the reason being that it has twice the cfm per minute and there looks to be minimal dust in the vac bags. maybe ill have a duel set up and post my results. great work.

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