Thien Baffle - Highly recommend!

  • Advertise with us
Project by SawdustTX posted 10-04-2021 09:43 PM 924 views 1 time favorited 8 comments Add to Favorites Watch

So impressed how well this works! I finally installed a Thien Baffle on my Delta 2hp dust collector. Amazing difference, especially for just a couple hours work.

The fourth photo is what I was having to clean out of the filter canister after each bag, and I was emptying the bag when only 3/4 full to limit the amount of material getting up into the filter. With the baffle in place, the fifth picture is the result – almost nothing collected in the filter, and only fines, no chips. Plus I can now run the thing until the bag is completely full.

It’s amazing to watch. Without the baffle, I had a huge tornado of chips in the collection bag, with lots getting sucked up into the filter pleats. Now with the baffle, the only thing that moves is the chips around the outer couple inches of the bag. Even creates a domed pile in the middle of the bag, with none of it lifting up into the filter area.

Made the baffle of 1/2” baltic birch. Three screws through the side of the collector drum into the baffle, then a 1” dowel from the baffle up to the collector (picture 3) to hold the “open” (slot) side of the baffle. The slot is 240degrees of the circle, the closed 120degrees goes right under the inlet.

I do still need to make a proper mounting ring for the canister, but for now (and the past 5-6 years) the ratchet strap does fine. :)

Got this from Fine Woodworking issue 232, March/April 2013.
The designer of this brilliant solution web page:

-- Make it your ambition to lead a quiet life, to mind your own business and to work with your hands. 1Thessolonians4:11

8 comments so far

View Jim Jakosh's profile

Jim Jakosh

27014 posts in 4397 days

#1 posted 10-05-2021 01:13 AM

Pretty cool and very useful. I don’t see a vortex on the collector. I have a vortex Dust Deputy on top of a 30 gallon barrel and my filter in the shop vac is always clean( except when I don’t empty the barrel and the shop vac fills with chips and they fill up halfway up the dust deputy)!!

Cheers, Jim

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

View HerringImpaired's profile


109 posts in 1000 days

#2 posted 10-05-2021 03:08 AM

Nicely done! I did something very similar on my Delta/Steel City dust collector with the same Wynn filter and it made a huge difference.

-- "My greatest fear is that upon my demise, my wife will sell my tools for what I said I paid for them."

View EarlS's profile


4824 posts in 3639 days

#3 posted 10-05-2021 11:26 AM

Basically, you are making a 2-stage DC but trying to do so in one stage. Consider mounting the thien baffle on a garbage can in front of the DC. It is a lot easier to empty the garbage can than the DC bag. Plus, any larger material that does make it into the DC has a place to fall out of the air stream before hitting the filter. With your configuration, any larger material that doesn’t stay below the baffle will wind up in the pleated filter and plug it off.

There are a lot of DC threads and reviews on LJ (mine included).

-- Earl "I'm a pessamist - generally that increases the chance that things will turn out better than expected"

View SawdustTX's profile


372 posts in 3615 days

#4 posted 10-05-2021 02:02 PM

@Jim, @EarlS appreciate the suggestions, both great ideas. I did do a ton of reading before going this route, but @EarlS I did not see yours, will check it out.

Here was my thought/decision process, input welcomed! Always looking for ways to improve the setup.

1. I don’t really have space for a separator
2. Adding a Dust Deputy or trash can separator reduces airflow bit.
3. With a 2hp dust collector, airflow is already marginal for catching the fine dust I don’t want to breathe and clean up. So the loss from an additional separator was not attractive to me.

The FWW article was very convincing regarding this solution for maintaining best dust collection airflow. :)

If I had a 5hp collector and more space, I’d add a full size cyclone, like Oneida or ClearVue, but with only 2hp and limited floor space, I went this route to maintain maximum airflow. Little less convenient to empty and I have to clean my filter a little more frequently, but for me seems like a good trade-off.

I started using regular trash bags on my collector vs. the dust collector specific bags. They cost way less, and best part is I just pull the full bag off, tie it up, and put a new one on. No dumping bags or cans into another bag!

This works very well with the baffle now, I’m getting very little in my filter, just some fine dust, no shavings.

Picture here of my collection this past week (that’s not normal, I’m reclaiming a bunch of fence pickets right now, way more planing than usual).

-- Make it your ambition to lead a quiet life, to mind your own business and to work with your hands. 1Thessolonians4:11

View Ross Leidy's profile

Ross Leidy

302 posts in 3233 days

#5 posted 10-05-2021 02:49 PM

I am really going to take a close look at this. I have a small shop and a similar DC, so this could be a nice, quick improvement for me. Thanks for sharing!

View Peteybadboy's profile


4175 posts in 3241 days

#6 posted 10-05-2021 04:31 PM

I have the same delta dust collector. I put the Wynn Environmental .5 micron canister on top of mine. Love it!

I need to study what you have done here.

Thanks for posting

-- Petey

View yhprum's profile


16 posts in 2184 days

#7 posted 10-05-2021 09:48 PM

Nice work. If you make airfoil shaped fairings for the dowels it will improve the airflow inside the separator.

View clagwell's profile


397 posts in 1084 days

#8 posted 10-06-2021 10:11 AM

I have the same setup on my Harbor Freight collector. It does indeed do a good job of keeping the filter cleaner. It also causes a measurable reduction in air flow, at least when compared to a clean filter. I measure an increased pressure loss of 1.44 in w.g. at 400 CFM. Then again, since I installed it about five years ago I’ve only had to clean the filter once. (I probably don’t cut as much wood as many people on this forum either.)

-- Dave, Tippecanoe County, IN --- Is there a corollary to Beranek.s Law that applies to dust collection?

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