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Thread: Dust Collector With Prefilter ?

  1. #1
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    Dust Collector With Prefilter ?

    I'm in the beginning stages of planning/building & setting up a dust collector in my garage.
    My plan is to build a Thien Baffle style at first & then probably upgrade later on to a cyclone.
    Thien Baffle.jpg

    Being I'm planning ahead for a regular cyclone later on, I'll be mounting the blower section as high as possible in my garage to give me the most room I can get underneath the blower.

    I watched this old video https://www.youtube.com/watch?v=k6kBkrE_4us and it shows a different way of converting a dust collector into a Thien style system.

    I will have a cartage style filter after the blower, But the video above gives me the idea of possibly making some type of pre-filter box in the extra space I have planned for a cyclone later on.

    Just curious if anyone has added some type of pre-filter after the separator, But before the blower?

    Doug

  2. #2
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    John made that video back in 2013, I bet if you asked him what would he would do different it would probably be plenty.
    i think that investing in a cyclone you will be ahead of the game in stead of the thien baffle style not knocking Phil.
    I built a system with a Baldor 2 hp motor with a 12 inch impeller and a Wynn environmental filter to filter the exhaust.
    and a Supper Dust Deputy Cyclone (5 inch system) I am happy with what I have, however if I had it to do over again I would seriously consider a designed and engineered system with even better efficiency with a 6 inch duct system. Yes 6 inches adds to cost in ducting and blast gates but I think it is worth it in the end especially if this where you will plant your self for many years. You can see what I made if you search my name on the forum.
    i will say the best thing I added was the bin sensor. I made that from parts less than $30.00.
    i have built an automated blast gate system that I will incorporate very soon that uses an Arduino Micro Controller when a tool starts up that blast gate opens and the other close.
    Good luck let us know how it turns out.
    I will your idea of building it tall for the future Cyclone is a good idea!

  3. #3
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    Why would you want a filter between the separator & blower? That adds complexity to the system with no benefit. The separate has already removed the large chunks that you don't want going through the blower.

  4. #4
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    Quote Originally Posted by Frank Pratt View Post
    Why would you want a filter between the separator & blower? That adds complexity to the system with no benefit.
    Probably because I like complexity & doing things differently.

    All kidding aside, I was just wondering if it would help any with the finer dust that would end up in the output filter.

    Doug

  5. #5
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    Quote Originally Posted by Lane Hardy View Post
    I think that investing in a cyclone you will be ahead of the game in stead of the thien baffle style not knocking Phil.
    Yeah I agree with you on that!
    Unfortunately my current budget is in the "Use What You Have" mode & I already have most of the materials on-hand for the Thien Baffle.

    Quote Originally Posted by Lane Hardy View Post
    I built a system with a Baldor 2 hp motor with a 12 inch impeller and a Wynn environmental filter to filter the exhaust.

    If I had it to do over again I would seriously consider a designed and engineered system with even better efficiency with a 6 inch duct system.
    Do you think your current system with a Baldor 2 hp motor with a 12 inch impeller would work ok with 6" ducts?

    From what I've read 5" ducting is the "Sweet-Spot" for a 2hp blower with a 12" impeller, Which is what I have.
    IMG_2460.JPG
    The blower section came from a Cincinnati 2hp. 3ph. dust collector model# 200S like this one.
    Cincinnati 200S C-L Pic..jpg

    Quote Originally Posted by Lane Hardy View Post
    your idea of building it tall for the future Cyclone is a good idea!
    Here's a picture of what it may eventually look like with a cyclone.
    E-Bay Cyclone.jpg

    Doug

  6. #6
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    Quote Originally Posted by Frank Pratt View Post
    adds complexity to the system
    As for adding complexity to the system, I'm already doing that with my exhaust filter set-up.

    I picked up several surplus canister filters awhile ago from a machinery surplus store.
    The filters were never used & sat in cardboard boxes for several years.
    They were made for a commercial dust collector that used multiple canister filters & the air-flow direction was designed to flow from the out-side to the in-side.
    Filter Cratridge Side.jpgIMG_4755.JPG

    Of course this is opposite of what is usually used for regular style dust collectors, But I got 4 of them for $100 so I figured I could come up with something
    I gave 1 to a friend which levees me 3 to work with. One for the prototype set-up, If everything works ok I'll have two back-up filters.

    I've been known for doing things "Backwards" so I figured I would start with building a cabinet for the filter first. With only a two car garage space is also a issue for me, So I started in a corner where I originally had my air compressor.
    IMG_4741.JPG
    My plans are to locate the air compressor next to the filter cabinet & then have the dust collector next to the compressor.

    I'm still working on this filter cabinet set-up, But here's what I have so-far.
    IMG_5549.JPGIMG_5524.JPGIMG_5554.JPGIMG_5546.JPG

    My next challenge is trying to figure out some type of bottom drawer set-up that can collect any excess dust from the cabinet?

    Doug
    Last edited by Doug Walls; 09-13-2019 at 3:42 PM.

  7. #7
    I had a Thein baffle that worked well with my (little) Rockler Dust Right. It was a major improvement in my single-garage shop and caught 95% or more.

    But adding another filter is going to decrease your suction. Probably significantly. And it'll be one more filter to clean.

    T

  8. #8
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    Quote Originally Posted by Tony Latham View Post
    I had a Thein baffle that worked well with my (little) Rockler Dust Right. It was a major improvement in my single-garage shop and caught 95% or more.
    That would be great if I can get 95% out of a Thien Baffle!

    Doug

  9. #9
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    Quote Originally Posted by Lane Hardy View Post
    John made that video back in 2013, I bet if you asked him what would he would do different it would probably be plenty.
    I didn't try to get in touch with John, But I ran across this other video he made that may explain why not much more was posted on his old set-up!
    https://www.youtube.com/watch?time_c...&v=u6TOOYlfITo

    Doug

  10. #10
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    I've decided to try and build a regular cyclone instead of going with the "Thien Baffle" Here's a link to a new thread I started https://sawmillcreek.org/showthread....lone-Separator

    Doug

  11. #11
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    Quote Originally Posted by Doug Walls View Post
    That would be great if I can get 95% out of a Thien Baffle!

    Doug
    I realize that another thread has been started by Doug, but thought that I would opine on this thread. I built a Thien baffle for my 2 HP Harbor Fright Dust collector. Unless I overload the baffle with a huge "gulp" of dust and chips I don't see anything leaving the dust collector. I vent outside (because of my warm climate) and under normal operating loads, I never see anything blowing out the exhaust. Also, the stuff that I collect in the 35 gallon galvanized trash can consists of everything from coarse pieces, a few pieces of sand paper and also a lot of "fines". So I suspect that I am getting at least 95% collection. Because I exhaust outside, it doesn't really matter if I'm collecting 95% or 99%. In the last year I've dumped perhaps 150 gallons of collections but don't see anything piling up outside by my exhaust.

  12. #12
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    Quote Originally Posted by Brice Rogers View Post
    I built a Thien baffle for my 2 HP Harbor Fright Dust collector. Unless I overload the baffle with a huge "gulp" of dust and chips I don't see anything leaving the dust collector.
    Quote Originally Posted by Brice Rogers View Post
    I suspect that I am getting at least 95% collection.
    Thanks for the info. Brice!

    It's good to know that a Thien Baffle will work that good.

    Even though I've decided to build a regular cyclone for my main dust collection system, I also have a 16gal. Ridgid shop-vac that I'm thinking of adding a Thien Baffle to.

    Doug

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