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Thread: Update on the DC Collar

  1. #1
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    Update on the DC Collar

    Some of you might have been following the saga of my new Harbor Freight DC. If not, here's part of the history, and here's the other part. Some of you also expressed interest in the collar that I added when I put in the neutral vane. I can save you some time...it doesn't help, and in fact it blows more chips into the filter with the collar than without.

    Here's a video showing the amount of chips falling out of the filter after the DC is turned off, both with and without the collar. Even though the low-resolution video is a bit blurry, it's easy to see clumps of chips falling out of the filter when the collar is installed, and they're not falling when the collar is not there.

    I don't know enough about the aerodynamics involved, but I suspect part of the problem may have been turbulence from all the tabs at the top of the collar. When I removed the filter to take off the collar, there was quite a bit of stuff stacked up that would have slid into the bag freely had it not been for all the tabs around the rim.

    Attachment 3863

    Regardless, the collar is now sitting in the scrap pile.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

    workingwoods.com

  2. #2
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    Thanks vaughn, you just saved me some work.. did you run a similar test with and without the neutral vein ?
    "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

  3. #3
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    Vaughn,
    I'm glad you posted that! Just last weekend, I installed a 'neutral vane' and a collar in my Penn State 2 hp DC. I immediately noticed the very same effect that you did. About halfway through the 'wind-down' when I shut it off, a huge quantity of chips and dust falls out of the upper (cartridge) area, indicating that it had been rattling around in the upper half of the DC the whole time it was running. I'mm assuming that long runs, using the planer, would accumulate even more debris in the upper area (haven't tried it, just speculating). So...I guess the collar is coming off mine, too.
    Jim D.

  4. #4
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    Question

    .... Just one question Vaughn. Did you tapper the collar from the top down or was it the same diameter at the bottom as the top ?

    Thanks in advance

    Boyd


    Quote Originally Posted by Vaughn McMillan View Post
    Some of you might have been following the saga of my new Harbor Freight DC. If not, here's part of the history, and here's the other part. Some of you also expressed interest in the collar that I added when I put in the neutral vane. I can save you some time...it doesn't help, and in fact it blows more chips into the filter with the collar than without.

    Here's a video showing the amount of chips falling out of the filter after the DC is turned off, both with and without the collar. Even though the low-resolution video is a bit blurry, it's easy to see clumps of chips falling out of the filter when the collar is installed, and they're not falling when the collar is not there.

    I don't know enough about the aerodynamics involved, but I suspect part of the problem may have been turbulence from all the tabs at the top of the collar. When I removed the filter to take off the collar, there was quite a bit of stuff stacked up that would have slid into the bag freely had it not been for all the tabs around the rim.

    Attachment 3863

    Regardless, the collar is now sitting in the scrap pile.
    Thinking about a project without ACTION is just DAY DREAMING .

  5. #5
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    Quote Originally Posted by Boyd Gathwright View Post
    .... Just one question Vaughn. Did you tapper the collar from the top down or was it the same diameter at the bottom as the top ?

    Thanks in advance

    Boyd
    Don't know about Vaughn's, but mine is (was) a straight column - no taper. It works (worked) just like Vaughn's, which is to say it didn't work well at all.
    Jim D.

  6. #6
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    Quote Originally Posted by Boyd Gathwright View Post
    .... Just one question Vaughn. Did you tapper the collar from the top down or was it the same diameter at the bottom as the top ?

    Thanks in advance

    Boyd
    Like Jim, I made mine a straight column. I've got the full blow-by-blow story here. I may try a tapered collar sometime if I run out of things to do in the shop. I theory is seems like it'd work, but I'm pretty aerodynamically ignorant. (Sorry to see your results were the same, Jim, but glad to see my results confirmed, too.)

    Don, I didn't have time to test with and without the neutral vane, but with the vane, I'm not seeing chips go up into the filter.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

    workingwoods.com

  7. #7
    I have a similar (Grizzly) 2hp DC (Looks like it came off the same assembly line.) I wonder why you added the neutral vane and collar to begin with. Is there something I missed?

  8. #8
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    Quote Originally Posted by Bill Simpson View Post
    I have a similar (Grizzly) 2hp DC (Looks like it came off the same assembly line.) I wonder why you added the neutral vane and collar to begin with. Is there something I missed?
    The neutral vane has been suggested in the past for this type of collector by several folks, most notably Bill Pentz. The idea is to keep the incoming particles from disrupting the flow of the particles already in the DC. Someday when I have it apart to change the bag, I might try running some 'before and after' experiments with the neutral vane. Mine is a tight fit, so it'll take some hammering to get it out.

    The collar was something I saw somewhere in the 'net, and thought it looked like a good idea. Considering the collar only took about 5 or 10 minutes to fabricate and install, I guess it was worth the experiment.
    When the going gets weird, the weird turn pro. - Hunter S. Thompson
    When the weird get going, they start their own forum. - Vaughn McMillan

    workingwoods.com

  9. #9
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    This is great, Vaughn!! I've had the exact same DC sitting in the corner of my shop for a couple of years now, albeit still green.

    First chance I get, I'm going make this mod. Can you post a link to the filter cartridge you used? Thanks!!!

    - Keith

  10. #10
    Quote Originally Posted by Keith Starosta View Post
    This is great, Vaughn!! I've had the exact same DC sitting in the corner of my shop for a couple of years now, albeit still green.

    First chance I get, I'm going make this mod. Can you post a link to the filter cartridge you used? Thanks!!!

    - Keith
    Not Vaughn but here you go... mentioned in earlier part of the saga..

    http://www.wynnenv.com/35A_series_cartridge_kit.htm

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