Dust collection separation

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Forum topic by willhime posted 03-17-2019 09:34 PM 805 views 0 times favorited 10 replies Add to Favorites Watch
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151 posts in 2217 days

03-17-2019 09:34 PM

Topic tags/keywords: jig question resource tip trick

A few years ago I donated my harbor freight 2 hp collector to a woodworking coop I help out at. I had done the 2 stage mod with the $30 inlet/outlet lid from woodcraft and a metal trash can. It works pretty good. I just bought another collector and am considering doing the same thing but noticing the Oneida deputies being touted as better. Is there a big quality difference between the trash can mod and the deputies ? And if so is there a big difference between the super deputy and the smaller ‘deluxe’ deputy ? I know the smaller one is only for 2-3” hoses but figured a reduction hose might suffice since the separated dust takes years to fill up the trash can. I know I’ll lose something with the reduction but I want to make sure it’s a big enough loss to justify another $100 on the larger deputy. Or is it all hype and the trash can method is just fine ?

-- Burn your fire for no witness

10 replies so far

View ocean's profile


205 posts in 1512 days

#1 posted 03-18-2019 12:35 AM

I’m in the same boat you are and I am looking at the Oneida Super Dust Deputy (SDD) Deluxe – 4” in and out and a drum. If you go to the site there are several different models. Three models with different in/out sizes, a metal one and several smaller (2”) models. Any of the larger models will complement HD Freight collector but the smaller ones will only choke down the collector badly. Smaller ones work well with a shop vacuum. I have been using one for several years.To answer your main question they are all cyclones and will greatly improve your collection over the home made simple trash can design. The bigger question how much money you wish to spend. I’m building mine over a number of months so the money question is spread over time. I’ve never built a trash can design so I can’t comment on loss of suction. Best of luck however you go.

-- Bob, FL Keys

View skatefriday's profile


453 posts in 2161 days

#2 posted 03-18-2019 04:24 PM

Just emptied a full 20 gallon trash can yesterday. Harbor Fright dust collector made sitting on homemade Thien Baffle. I vent outside and in 5 years of use have never seen noticeable chips or dust at the vent outlet.

View fivecodys's profile


1603 posts in 2315 days

#3 posted 03-18-2019 08:32 PM

I just went through all of this last year. I looked at the Thein -vs- SDD and read everything I could get my hands on. Google Bill Pentz. He has some great articles on dust collection theory and practice.

Without knowing what size blower you are using, it’s hard to give advice but I can tell you what I tried and my results:

I tried a basic trash can separator and was not very happy with the results. I still had quite a bit of dust making it’s way to the bag on the collector. I was losing a lot of CFM’s and my blower just wasn’t big enough to make this work well.

I gave very serious thought to building a Thein seperator like many of the folks here have done. They have reported pretty good results. I was starting with a basic DC (Jet DC1100) so that sounded like the best way for me to go.

After reading Bill Pentz’s work on dust collection, I became more interested in cyclones. Most were just too expensive. I wanted to have a ducted system and I wanted to squeeze the most out of what I had available so for me the Super Dust Deputy began to make the most sense and was affordable. There is a lot that goes into making a system efficient. Bill does a good job explaining that. I also leaned heavily on the guys at Oneida for help but my biggest influence were the Lumberjocks. They were very patient and helpful.

I have been using mine for a year now and have no complaints.

Just my 2 cents. Your results may vary.

-- A bad day woodworking is still better than a good day working.

View Holbs's profile


2283 posts in 2708 days

#4 posted 03-19-2019 03:57 AM

I started off with a shop vac and the Dust Deputy. Wonderful little thing!
Upgraded to 3HP dual bag Grizzly and 16” top hat Thein Baffle for economical purposes and the fun build project. Now have the 3HP motor sitting ontop of a Super Dust Deputy XXL (6” inlet/6”outlet).
Yes…there is a difference in suction, CFM, and separation between the baffle and XXL. 10-20% difference. Is that big? Maybe. Maybe not. I would of kept the baffle but made the effort to reclaim floor space and the XXL was the answer.

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter "xylokopos/ξυλοκὀπος"

View Sparks500's profile


265 posts in 1009 days

#5 posted 03-19-2019 10:07 PM

The Pentz system. He has detailed plans.

-- A good day is any day that you're alive....

View Sparks500's profile


265 posts in 1009 days

#6 posted 03-19-2019 10:08 PM

And apparently defies gravity….

-- A good day is any day that you're alive....

View fivecodys's profile


1603 posts in 2315 days

#7 posted 03-19-2019 10:38 PM

And apparently defies gravity….

- Sparks500

He is amazing that way! :)

I have to open all my photos in Microsoft Paint and re-save them or they do the same thing. Frustrating!

-- A bad day woodworking is still better than a good day working.

View MikeDilday's profile


285 posts in 1137 days

#8 posted 03-20-2019 12:21 AM

You definitely do not want to use a separator with an inlet or outlet smaller than you mains. That will restrict the airflow thru the entire system. 4” mains are the minimum for a small system. 6” if you have a larger system with more horsepower. CFM thru the pipes needs to be calculated to assure adequate airflow to move the chips. Use the Bill Pentz spreadsheet.

-- Michael Dilday, Suffolk, Va.

View HackFabrication's profile


167 posts in 390 days

#9 posted 03-20-2019 03:27 AM

I have a trashcan lid separator that I use on my DeWalt planer (which has an internal blower). It works quite well with a PowerTec bag to collect the finer particles:

I’m presently working on my HF dust collector upgrades with a Rikon impeller, SDD, Wynn filter. 6” blower inlet:

Eventually this will find a semi-permanent location in my basement shop and be plumbed into 5” ducting with 4” drops. On a side note, the upgraded DC has a footprint less than 2 ft longer and less than 1 ft wider than the stock HF unit. I’ll be using it temporarily as a 1 machine at a time unit, as I’ve reduced the 5” inlet on the SDD to 4”.

From what I’ve read on the internet, the trashcan separators will reduce the CFM more than the cyclones. But take this for what it’s worth, the cyclones also reduce the CFM’s a bit too. Which is the reason you have to go big with the blower if you’re using any sort of pre-separator. And assuming you have enough horsepower and blower capacity, you need to run the largest size ducting your system will support. If you’re only concerned about dust collection at one machine at a time, the smaller systems should be adequate. But, there is a whole lot of data on the internet about how many CFM’s each machine requires for maximum dust collection.

-- "In the end, it's all Hack..."

View WhyMe's profile


1249 posts in 2239 days

#10 posted 04-15-2019 01:44 PM

I was originally using a trash can separator with my HF dust collector. I did mods adding the Super Dust Deputy and it works a lot better than the trash can separator.

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