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  1. #1
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    Default Metal dust extraction for linisher

    My recently acquired Multitool linisher is great, but it is leaving a lot of metal dust on the floor (and probably everything else in the workshop if I cared to look). I'm wondering about the feasibility of a dust extraction system for metal dust. It should be a fairly simple setup- a large chute below the linisher, a hose and a DE or shopvac. My only concern is that sparks may start a fire in the collection container. Do any of you guys have a dust extractor setup for metal grinding/linishing?
    Chris
    Chris

  2. #2
    Dave J Guest

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    I am having the same problem with my metal linisher. H&F do sell a metal dust extractor and the hose to go with it, but it's getting expensive for the home shop.

    Dave

  3. #3
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    Default ... Near the Fire Extingisher ..

    My vaccuum-maid system is the recipient of dust from my (3) bench mounted grinders/linishers. Fortunately, the distance to the vac is about 3m of PVC pipe with wrinkly stuff on the entrances. The other fortunate thing is that the fire extinguisher is right next to the grinders!!

    Regards, Daryl

  4. #4
    BobL is offline Member: Blue and white apron brigade
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    All the H&F metal dust collector has is a steel chip collector between it and the impeller/bag. It would be pretty easy to set up a small steel drum with appropriate inlets and outlets connected to either a shop vac or a wood working dust collector.

    FWIW, for years I used my Makita belt sander upside down on a stand like this, as an all purpose sander / linisher. I did a lot of steel/ally/brass with it but nothing ever melted or burned. The sander is now 7 years old and still working as well as ever.


    The 2" transparent ducting enabled me to see how far any sparks travelled along the tube and while there were often a lot of sparks coming off the back of the belt I never saw any in the tube - I could check this more sensitively by running the sander at night. Over time the hose, which ran for 3 m under my bench to a small DC, would slowly fill the bottom of the hose with metal dust and once a year or so I would empty it .

  5. #5
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    Default

    Thanks fellas. Maybe something like this attached to the side of the pedestal and hooked up to a shopvac via a 100-50 reducer.

    Big Gulp Dust Chute : CARBA-TEC

    Chris

  6. #6
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    Daryl,
    I was more worried about a smouldering fire that erupted after I had left the workshop. After giving it more thought, I can't see the metal dust burning anyway. As long as I empty the extractor after using it for wood it should be fine. Actually, probably better to just have a dedicated metal vac. My fire extinguisher is nearby too.

  7. #7
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    My experience with a linisher indicates the dust (metal or otherwise) doesn't go very far at all.

    There's no fan on the unit to blow it anywhere and it just drops on the floor in a very small area.

    Hoover it up once in a while when it becomes visible. Not an issue IMHO.

    Rob

  8. #8
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    Metal dust does burn. Remember lighting steel wool?
    Grinding dust also burns but its been so long I dont recall much detail other than watching "the pretty little red lines dance their way along the grinding swarf".

    Stuart

  9. #9
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    Quote Originally Posted by Stustoys View Post
    Metal dust does burn. Remember lighting steel wool?
    Grinding dust also burns but its been so long I dont recall much detail

    Stuart
    It would have to be airated to burn.

    I have a cutoff saw that shoots all of the cuttings and grindings into a large metal box type trap. It has plenty going into it yet there is no sign of a fire ever. Just as well I suppose.

    Why? Probably because it's all fairly packed down and there's not the air volume to support combustion. A bit like the old flour explosion experiment at school where flour won't burn, but it will explode when puffed up with air next to a flame. Booooooooooom. Good one.

    The only thing that might burn with the linisher would be any plastic, organic, or rubber bits that comprise the envisaged dust collector/extractor.

    Rob

  10. #10
    Dave J Guest

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    Quote Originally Posted by jack620 View Post
    Daryl,
    I was more worried about a smouldering fire that erupted after I had left the workshop. After giving it more thought, I can't see the metal dust burning anyway. As long as I empty the extractor after using it for wood it should be fine. Actually, probably better to just have a dedicated metal vac. My fire extinguisher is nearby too.
    What about building a small cyclone unit just for the steel dust, say the size of a bucket? That way there is no worry about wood contamination for fires.
    You could just build a simple one and have it at the base of the grinder, and just connect it when needed, or even have a Y section with a gate so it only needs opening.

    Come to think of it I might do something like that because I have a dust extraction kit from a few sales ago still sitting in the box.

    I do think tiny particles float in the air for a fair distance, and if you have a slight breeze even worse.

    Dave

  11. #11
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    Quote Originally Posted by nearnexus View Post
    My experience with a linisher indicates the dust (metal or otherwise) doesn't go very far at all.
    There's no fan on the unit to blow it anywhere and it just drops on the floor in a very small area.
    Hoover it up once in a while when it becomes visible. Not an issue IMHO.
    Rob
    That's my impression too, but maybe Dave knows something I don't. A magnetic broom works well on grinding dust.

  12. #12
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    I didn't think of a magnetic broom. I made a magnetic wand for my lathe swarf. I'll try it on the metal dust.

  13. #13
    Ueee's Avatar
    Ueee is offline Blacksmith, Cabinetmaker, Machinist, Messmaker
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    I find its not the linisher thats a problem, its the angle grinder. Not the sparks but the grit from the wheels, it tends to float all through the shed if you grind inside. I only use the angle grinder outside these days.

    Cheers,
    Ew
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.

  14. #14
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by Ueee View Post
    I find its not the linisher thats a problem, its the angle grinder. Not the sparks but the grit from the wheels, it tends to float all through the shed if you grind inside. I only use the angle grinder outside these days.
    Yep - its the bonding agent in those wheels that are not that good for you either. That stuff sets my smoke alarm going whereas the bench grinder and other MW stuff don't and is one reason why I set up a fume hood to do MW in. The fume hood has turned out to wrok extremely well. Also works well on welding fumes, the small amount of spray painting I do and now I'm hoping it can also exhaust the hot forge gasses as well.

  15. #15
    Dave J Guest

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    Quote Originally Posted by Bryan View Post
    That's my impression too, but maybe Dave knows something I don't. A magnetic broom works well on grinding dust.
    Hi Bryan,
    I have been grinding cast iron and I have found it up to around 3 meters away from the linisher with the magnetic pick up tool. I also find it pretty well that far with steel grinding and timber just goes everywhere.

    The stuff gets up my nose so it's definitely airborne, and thats even if I have the top cover over the linisher and just use the front half of the wheel with it's dust collector tray.

    Dave

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