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Thread: Dust collection wizards...

  1. #1
    Join Date
    Nov 2006
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    Delton, Michigan
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    Dust collection wizards...

    3 hp motor-13" steel impellor-- how much suction will it produce? 8" inlet and outlet, 6" duct on all main lines..
    compared to a 2hp and 12" impelllor?
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  2. #2
    I don't know about being a wizard but I would say about 1300 to 1400 cfm.

    Did you get a new dust collector?

  3. #3
    Join Date
    Nov 2006
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    Delton, Michigan
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    ok that would be an improvement over the 2hp setup right? and by how much alan??
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  4. #4
    Join Date
    Oct 2006
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    somewhere east of Queen Creek, AZ - South East of Phoenix
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    Larry you will see some improvements but looking at the testing done by Bill Penze on his website I think it would be minimal. Here is a link go to the Excel spread sheet and there is a chart showing the information.
    "There’s a lot of work being done today that doesn’t have any soul in it. The technique may be the utmost perfection, yet it is lifeless. It doesn’t have a soul. I hope my furniture has a soul to it." - Sam Maloof
    The Pessimist complains about the wind; The Optimist expects it to change;The Realist adjusts the sails.~ William Arthur Ward

  5. #5
    Right above the static calc table is a fan table giving approximate cfm's for given fan sizes and motor horsepower.

  6. #6
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    so as don said and alan lead me to, its not big improvement huh
    If in Doubt, Build it Stout!
    One hand washes the other!
    Don't put off today till tomorrow!

  7. #7
    Join Date
    Oct 2006
    Location
    somewhere east of Queen Creek, AZ - South East of Phoenix
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    Nope, If your gonna spend the money I'd go for a 16" with a 5 HP.
    "There’s a lot of work being done today that doesn’t have any soul in it. The technique may be the utmost perfection, yet it is lifeless. It doesn’t have a soul. I hope my furniture has a soul to it." - Sam Maloof
    The Pessimist complains about the wind; The Optimist expects it to change;The Realist adjusts the sails.~ William Arthur Ward

  8. #8
    Join Date
    Jul 2011
    Location
    The Gorge Area, Oregon
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    4,698
    Although its not as simple as HP and size, if the fan was a different shape (like the 2HP was really inefficient and the 3HP was way better designed) you could see a bit of a jump. At best I'd say maybe 25% effective (delivered at the end of the pipe) if the stars aligned right. On the flip side if the reverse is true it might not be any improvement at all...

    Buying dust collectors is worse than buying a bed, why yes this is definitely the most comfortable thing you'll see today.. Why are you laying down on it my good sir, don't you trust me?

  9. #9
    Join Date
    Jun 2007
    Location
    Oceanside, So. Calif. 5 mi. to the ocean
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    Hi Larry,

    A huge factor in efficiency is how you run your ducts.

    Really, really, really try not to have any 90* turns. Do a 45* ell into a short coupling (translate that to 6inch length of your 6 inch ducting) into another 45* ell. It takes 3 inches of pipe to go into a fitting, so the two 45* ells use up 6 inches of pipe so they can fit coupling to coupling. You can make the coupling longer if you wish.

    Do not use any more flex than is absolutely necessary.

    Be sure that all blast gates, except the one you are using right now, are closed.

    My set up is a 2hp PennState. With this setup I am satisfactory. I do not have ANY surplus. If a second blast gate is open, my efficiency drops like a rock. My setup is inadequate to use a "Big Gulp" type of thing at the lathe. I have to use two of the flex-duct pipes that stay in the position where I put them. That means I have to adjust them every time I work on a different section of the turning.

    My bandsaws, drill press, thickness planer, sanders, table saw and router (router has its own ShopVac) all work fine.

    I cannot remember the impeller size. I do remember that the amperage is low for a real 2hp motor. They claim 1,500 CFM. Don't get me wrong. I am not buying a new DC. This one works well enough to keep me happy---and I really, really, to not like wood dust. However, If I had been more knowledgeable at the time of purchase I would have purchased a gutsier unit.

    I purchased the PennState (DC2000) because it had one micron bags. To me that is extremely important. It is the fine stuff you cannot see that kills you. The one micron bags ended up not really mattering because I built a shed outside of my shop to house the DC (and give me more storage).

    The other factor was the price. Read the data on other DCs and compare to the PennState. With 1 micron bags 1,500 CFM etc. you will find that they have a higher price.

    The "dust" on the cover of the magazine is all of the dust removed from an 18-foot section of 6 inch pipe after several years of use---everything else made it to the dust collector bag. The pic showing the three pipes joining and going through the wall is where the system leaves the shop and goes next door into the dust collector itself.

    One pic shows two 45* ells making a 90* turn. Another pic shows the end of a piece of 4 inch flex that was a drop from the 6-inch to a machine. It had been used for several years.

    If you have any questions, ASK.

    Enjoy,

    JimB
    Attached Thumbnails Attached Thumbnails DC Dust from 18 ft Duct.jpg   RtAngleTurnC45WyeAnd45El.jpg   DC Inside Flex Slight Dust 1.jpg   DC overhead ducting.jpg   GoodTwo45sMaking90.jpg  

    NoWallWye1.jpg  
    First of all you have to be smarter than the machine.
    VOTING MEMBER

  10. #10
    Join Date
    May 2007
    Location
    Thomasville, GA
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    When I researched larger DCs in 2006-07, I decided on the 3hp SDG based on its rated capacity. I knew I'd be able to have 2-3 ports open at the same time with no real reduction in performance. As others have said, you do not want to use any 90° elbows; sweeps are much better (I chose sweeps over 45° pairs for fewer joints). I had to stretch the budget a bit to get the 3hp, but I phased in the ducting over the next year or so to spread out the cost.
    Bill Arnold
    Citizen of Texas residing in Georgia.
    NRA Life Member and Member of Mensa
    My Weather Underground station

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