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  1. #46
    BobL is offline Member: Blue and white apron brigade
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    Quote Originally Posted by steamingbill View Post
    Thanks Bob,

    Thats great news.

    Am going to shamelessly copy what youve done.

    Just gotta figure out whereabouts on the list it fits.

    Bill
    No worries.
    While you are at it see if you can improve the design.

  2. #47
    BobL is offline Member: Blue and white apron brigade
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    Been using this unit for 2 months now and although I haven't used it that much I am very happy with how it works.

    One thing I have noticed is how much longer the wheels are lasting at the higher speeds than are possible with a table saw, and the more controlled feeds that can be made by waving around an angle grinder at a piece of steel.

    In fact I'm still using the same cutting wheel I installed in July when I first assembled it

  3. #48
    BobL is offline Member: Blue and white apron brigade
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    Been using this thin kerf cutting wheel in the last week or so and decided what the metal dust catcher could do in reducing the dust it generates.

    This is what the metal dust catcher looks like.
    Mostly I use it on the small linisher, Scotchbrite and wire wheel as these make a lot of dust.



    With the thin kerf cutting wheel there is a polycarbonate spark shield


    but together with the full face shield I'm wearing, this restricts vision so I often use it without the spark shield (just the full face shield) for things like bolts, or short cuts.

    The bulk of the sparks and metal dust shoots straight down into a metal food can located under the wheel (its now about half full of steel dust) but many sparks come flying off the wheel across the table and hit the full face shield and there is invisible dust flying all over the place as witnessed by my particle counter I have running nearby. I stand to the left so the shower of sparks catches me just above the right tit but the cut is short and I wear a full length leather apron so's I don't set myself alight.

    Time to switch in the metal dust catcher.
    It's the start of the cut so gently does it, so there's not that many sparks but you can see the top of the can under the saw glowing indicating it's catching a lot of sparks and dust.
    catchcan.jpg

    Bit further into the cut - more pressure -more sparks, some escaping but not many.
    Look at the spark that hits the rim of the dust catcher mouth (red arrow) this slows it down so the air drags it into the catchers maw.
    Bullseye.jpg

    Deep in the cut with the Dust extractor cranked up to catch almost all of the sparks.
    I'm pretty pleased with that.
    bestofthebest.jpg

    Now almost through and with more pressure still and when the kerf is able to touch the back of the cutting wheel it produces of sparks that evade the dust catcher.
    I can crank the dust extractor up a lot more and will do that next time.
    Backaofblade.jpg

    This one is interesting - you can see the sparks trajectory marked with the red arrow was initially upwards left but the air stream imto the catcher was able to deviate it back into its maw.
    Lonespark.jpg
    Oh yeah and there was a significant drop (>70%) drop in the dust levels recorded by the particle counter - that was the main idea behind all this.

  4. #49
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    Wonderful stuff Bob.

    Well designed and thoroughly documented as always.

    Bob.

  5. #50
    BobL is offline Member: Blue and white apron brigade
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    Thanks Bob, 7 years to the day since I finished making the stationary cutting wheel gizmo. I use it at least a couple of times a week and it works just as well as when I first make it.

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