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  1. #1
    Join Date
    Jan 2002
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    Default Designing a new workshop

    Greetings all, I have been off line here for a while, but I am now ready to start building a new workshop.

    I am thinking of placing my dust collector under a work bench and have it connected to a collection line which will run around the base of the walls with blast gates at various points along the line.

    My question is: What size pipe should I use for the collection line?

    I have considered using 90mm PVC. should I go with this or maybe think of using a smaller diameter pipe?

    Thanks
    I try and do new things twice.. the first time to see if I can do it.. the second time to see if I like it
    Kev

  2. #2
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    Riverhills, Brisbane
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    Default

    In a perfct world it would be better to use 100mm metal ducting. If you use PVC earthing will be necessary every so often as static electricity can build up. If you are placing the pvc on the floor it may be OK but it may still have some static buildup

  3. #3
    Join Date
    Aug 2006
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    Hills District, Sydney
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    Default

    g day Brudda

    My question is: What size pipe should I use for the collection line?

    I have considered using 90mm PVC. should I go with this or maybe think of using a smaller diameter pipe?
    Not sure what type of dusty you have but....generally, bigger is better...the smaller the dia pipe you use the more resistance there is to airflow ....there for reducing airflow. I used 100mm PVC but 150mm would be better.

    I also wouldnt be too concerned about static...there has been heaps of debate on this and the general consensus for small workshops is that a dusty under 3hp will not generate enough static to cause a problem. You are more likely to start a fire using a blunt blade (smoke and embers) or sucking up something metal to cause a spark.

    cheers
    BD

  4. #4
    Join Date
    Nov 2004
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    Port Pirie SA
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    Default

    Put your dusty in a outside enclosure.
    ....................................................................

  5. #5
    Join Date
    Feb 2003
    Location
    Garvoc VIC AUSTRALIA
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    Default

    Quote Originally Posted by Harry72 View Post
    Put your dusty in a outside enclosure.
    Regards, Bob Thomas

    www.wombatsawmill.com

  6. #6
    Join Date
    Jul 2003
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    On the Downs, Darling SEQld
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    Default

    Quote Originally Posted by skot View Post
    In a perfct world it would be better to use 100mm metal ducting. If you use PVC earthing will be necessary every so often as static electricity can build up. If you are placing the pvc on the floor it may be OK but it may still have some static buildup
    Hang the PVC Piping off of the Metal Stud Framing.....No Static
    Navvi

  7. #7
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    Canberra
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    Default

    Quote Originally Posted by Brown Dog View Post
    I also wouldnt be too concerned about static...there has been heaps of debate on this and the general consensus for small workshops is that a dusty under 3hp will not generate enough static to cause a problem. You are more likely to start a fire using a blunt blade (smoke and embers) or sucking up something metal to cause a spark.
    I thought the same thing, but yesterday the static on the 4" connected to the 16-32 drum sander was amazing. It wasn't enough to spark - I don't really know how much that would be, but it didn't on the day - but it was getting uncomfortable reaching over the tube to transfer the timber from the outfeed back to the infeed.

    Rob

  8. #8
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    Nov 2003
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    Default

    Brudda, I asked the same question here a few years ago. The answer was the bigger the better. You should go with the 6" PVC pipe and a reducer to fit the 4" machines.
    Visit my website at www.myFineWoodWork.com

  9. #9
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    Quote Originally Posted by mcarthur View Post
    - but it was getting uncomfortable reaching over the tube to transfer the timber from the outfeed back to the infeed.

    Rob
    That is the real issue with static in small dust collection systems...

    Its not the chance it may cause the dust dust to explode that is any real danger ....but the odd zap (which can be quite strong in some circumstances). I know with my system if I walk past one of the down pipes while its on my hair stands up

    Here is an article by a bloke who seems to have done a fair bit of research on this topic


  10. #10
    Join Date
    Jan 2002
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    Yinnar, Victoria, Australia
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    Default

    Thanks for all of the responses, I have seen the "grounding" kits in Carba-Tec, and will think about using them.

    At the moment I am visualizing the collection pipework being on the ground, and secured to the workshop frame. I currently have an upright DC, but am considering getting one of the underbench units.

    The workshop is still in the "fliud" what,where,how stage, and I will not be ready to start for another couple of weeks.

    When it is finally in the "here and now" I will post a few pics.

    Thanks

    Kev
    I try and do new things twice.. the first time to see if I can do it.. the second time to see if I like it
    Kev

  11. #11
    Join Date
    Nov 2007
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    Canberra Australia
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    Default

    Quote Originally Posted by Wongo View Post
    The answer was the bigger the better. You should go with the 6" PVC pipe .
    Hi, I agree bigger would be better. I'm also thinking 6" metal ducting would be cheaper than PVC, hell you can even make it yourself.

  12. #12
    Join Date
    May 1999
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    Grovedale, Victoria Australia
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    Default

    Kev stick to the upright unit.
    Go as big as possible with the pipe 5" would be better.

    Keep as big as possible and only reduce to smaller size when really necessary.

    Static line is neccesary when high volume of materail is flowing through the pipe as in sanders and thicknessers.
    Jim Carroll
    One Good Turn Deserves Another. CWS, Vicmarc, Robert Sorby, Woodcut, Tormek, Woodfast
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  13. #13
    Join Date
    Nov 2004
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    Port Pirie SA
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    Default

    Quote Originally Posted by Uncle Bob View Post
    Hi, I agree bigger would be better. I'm also thinking 6" metal ducting would be cheaper than PVC, hell you can even make it yourself.
    Nope, 6" metal is dearer 900mm length is around $30 6m of pvc is $120ish, even if you make your own metal duct it wont be that much cheaper unless your in the sheet metal business.
    ....................................................................

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