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  1. 16th October 2010, 05:34 PM #1
    VicPete
    VicPete is offline New Member
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    Default Screaming hose on Dust Extractor

    Hi,
    I've set up a simple dust extractor using an old vac and a drum seperator. I've used some black flexible hose that's agi pipe but without the slots (like this stuff). The unit works brilliantly, but the hose absolutely screams. (It's definitely the hose, not the vac itself). It's an incredible noise that is going the have the neighbours sick of me in no time.

    Has anyone else had this problem? I'm wondering if its caused by the spiralled ribbing in the hose

    |vac|---|drum sep|----------screaming pipe----------|saw|



    Cheers, Pete
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  3. 16th October 2010, 05:51 PM #2
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    mic-d
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    Hi, yes it has come up a couple of times before, you should find the threads if you search for it. Maybe search "howling dust extractor" or resonance.

    Cheers
    Michael
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  4. 16th October 2010, 06:09 PM #3
    TP1
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    The plastic on the hose is very light and rigid compared to most vacuum hoses, which also have ribbing. Its resonant frequency is therefore achieved with far less force than would be required for a heavier, softer walled hose.
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  5. 16th October 2010, 10:40 PM #4
    elanjacobs
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    Might be a bit crazy, but try throwing some old towels on it to cut the vibrations
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  6. 16th October 2010, 10:58 PM #5
    BobL
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    Quote Originally Posted by elanjacobs View Post
    Might be a bit crazy, but try throwing some old towels on it to cut the vibrations
    Quote Originally Posted by TP1 View Post
    The plastic on the hose is very light and rigid compared to most vacuum hoses, which also have ribbing. Its resonant frequency is therefore achieved with far less force than would be required for a heavier, softer walled hose.
    This won't work - just like a brass instrument it's the air that's vibrating not the pipe. The ribbed hoses have more points of instability along its length that set the moving air vibrating but any hose vibration does not contribute to the sound you hear. Rather the vibrating air makes the hose vibrate

    You could try changing the length of hose but that will probably just change the frequency of the scream.
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  7. 16th October 2010, 11:07 PM #6
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    Dion N
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    I have been down this road before. Yes, ag pipe is cheaper, but it makes a horrible racket. Buy proper dust collection hose and read about my misadventures here
    "If something is really worth doing, it is worth doing badly." - GK Chesterton
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  8. 17th October 2010, 09:52 AM #7
    VicPete
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    Thanks guys,
    I'd done a bit of a search through previous posts, but didn't think to search on "resonance". Wish I'd looked harder before I bought the hose
    The verdict seems to be that in my attempt to save a few $s I've actually wasted a few $s. But maybe I'll have a use for some unslotted drainage pipe sometime in the future (more "stuff" for the shed in the meantime).

    I'll try breaking up the length by putting in some sections of other pipe but may have to fork out for the proper vac hose.

    If I get some free time, I'll start work on that conduitaphone. The neighbours will enjoy the experimentation

    Cheers All
    Pete
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