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  1. #16
    Join Date
    Apr 2006
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    Quote Originally Posted by BobL View Post
    3 x 120mm = 200 mm in cross sectional area, but not in terms of flow
    This business about cross section, flow, and air speed, is not rocket science, but it is easy to stuff up -- you know, a little bit of knowledge can be dangerous. Thanks for working through the calcs of starting from both sides (i.e. working with dividing the flow rate of a larger duct versus working with the sum of smaller ducts flow rates).

    While I've committed to some duct sizes, I still have only ordered about half of what I need, so I can make further decisions about exactly what sizes go to each machine. No matter what I decide, I will have to have some extra gates open to relieve pressure on the system and keep the air speed high in the main line. So there is still flexibility, which is why I'm trying to get to the bottom of the best solution for each machine.

    Thanks for the pic of your BS. As with John's, I'm going to try the three port system on my BS, and see how it goes. John mentioned checking his system next time you're in Brisbane. Yes, indeed -- put me on the list of shops to visit!

    Thanks for all your help! Cheers.
    Warm Regards, Luckyduck

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  3. #17
    Join Date
    Nov 2006
    Location
    Rockhampton
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    62
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    2,236

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    This is my under table pickup on the BS, it is kinda what Bob is talking about with the bed pan idea, it is the same machine as Bob's and in Bob's pic you can see with the door closed the only way for the dust to get to the pickup points is via a small slot thru which the blade passes, next to useless, I'd get heaps of dust collecting around the bearings and all along the top of the lower cabinet, so I cut the top corner off the door and made a shroud that allows air to flow into the top hose
    under table door closed.jpgdoor open.jpgdoor open 2.jpgdoor part.jpg
    It is in two parts, one half stays on the BS held in place by one bolt (easy to remove) and the other is attached to the door, the door part I made to match up with the slope that the brush is mounted on, air is now drawn in thru the hole in the table, over the top of the shroud and from behind the guides, since doing this there has never been any dust collect around the guides.
    With yours even if you can't get a hose as close as required a shroud (bed pan) designed to wrap around under the table and then away to the hose should work.

    This is the pickup in the lower cabinet
    btm cabinet dust extraction.JPG
    My only mods have been to remove the cross and a quick and rough bit of sheet metal angled to meet the hole just held in place with duct tape, that duct tape has been there quite a while now
    Both these OEM pickup points are rudimentry in there design and both need work to further improve flows but that's for another day.




    Pete

  4. #18
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    Apr 2006
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    Thanks Pete, especially for the photos. Can't wait to get my dusty up and running so I can play with flex and various options.
    Warm Regards, Luckyduck

  5. #19
    Join Date
    May 2012
    Location
    Brisbane (Chermside)
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    71
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    Quote Originally Posted by LuckyDuck View Post
    Your reference to "grey" versus "brown" dust on undisturbed surfaces must be like an impossible dream to most members here ...
    I still manage to make a mess occasionally. My biggest dust issue is the hand router ... it remains a dirty beast. The next most common form of dust is likely drills and other hand tools that don't have a vac pick up point followed by the thicknesser (which still has a 4" port) Finally, there is an outside chance that one day I will learn to open the blast gate ... every time ... before commencing the cut ... but don't hold your breath waiting.

    However, despite the issues I still have, the shop is a delight compared to what it used to be. I find that I have become intolerant of dust. There was a time when I waded ankle deep in the stuff, and sometimes when I walked into the shop in the morning my mucus membranes tingled. There was always dust in the air. These days if I have been drilling with a hand drill, or doing something else that puts shavings/dust on the floor or bench tops (like thicknessing), I nearly always pick it up with the vac immediately, before I walk it into the air. Having the vac flexy centrally located and operated by a remote hanging around my neck makes this quick and painless.

    It is worth mentioning that I produced so much dust that it found its way into the house, which is part of the same building. Her indoors was not impressed when my dust invaded her house (negative brownie Points). These days that is no longer an issue, and Sweetness and Light is was delighted when the dust devil was largely conquered (positive Brownie Points).

    Perfect it is not ... but it is a different world to the one that once was my shop, thanks to this forum and people like BobL, Chris and several others. If we recall that Total Exposure = Dust Level X Exposure Time, then my Total Exposure is likely less than 5% of what it once was.

    Have fun!

    John

  6. #20
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    Apr 2006
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    49
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    John, you make good points. I avoid the hand held router as much as possible -- I know sometimes it cannot be avoided but often there is another way with hand tools. I have the same issue regarding dust getting into the house as my shop is also directly attached. I have one large garage bay of three, so my space is shared with the rest of my family--cars, toys, etc. All this talk of fine tuning may sound paranoid to some, but I look forward to having a shop with much better dust management. Then I can get back to making furniture!
    Warm Regards, Luckyduck

  7. #21
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    May 2012
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    Quote Originally Posted by LuckyDuck View Post
    John, you make good points. I avoid the hand held router as much as possible -- I know sometimes it cannot be avoided but often there is another way with hand tools. I have the same issue regarding dust getting into the house as my shop is also directly attached. I have one large garage bay of three, so my space is shared with the rest of my family--cars, toys, etc. All this talk of fine tuning may sound paranoid to some, but I look forward to having a shop with much better dust management. Then I can get back to making furniture!
    You'll be fine. Just keep plugging away and before long you won't be coating cars/toys and the rest of the garage area in dust ... and her indoors will be pleased that your dust does not come into her house.

    Cheerio!

    John

  8. #22
    Join Date
    Jul 2009
    Location
    inverloch
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    472

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    Quote Originally Posted by John Samuel View Post
    You'll be fine. Just keep plugging away and before long you won't be coating cars/toys and the rest of the garage area in dust ...

    John
    I think John has it right. It is just over a year since I started building my workshop and at times I thought it was never going to be finished but now I am almost there with only the bandsaw to be connected up. The help of the members of this forum has been awesome. The dust system is now working so well it is a pleasure to spend time in the workshop compared to what it is like before.

    Thanks guys.

  9. #23
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    May 2012
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    Quote Originally Posted by safari View Post
    I think John has it right. It is just over a year since I started building my workshop and at times I thought it was never going to be finished but now I am almost there with only the bandsaw to be connected up. The help of the members of this forum has been awesome. The dust system is now working so well it is a pleasure to spend time in the workshop compared to what it is like before.

    Thanks guys.
    Safari,

    Have you posted pics of your hoods/ports and etc ... or have I missed them? Always looking for new ideas.

    Cheerio!

    John

  10. #24
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    Jul 2009
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    inverloch
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    472

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    Quote Originally Posted by John Samuel View Post
    Safari,

    Have you posted pics of your hoods/ports and etc ... or have I missed them? Always looking for new ideas.

    Cheerio!

    John
    Hi John,
    I did post some pictures some time ago. We are on holidays at the moment but will post an update when I get home.

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