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  1. #1
    Join Date
    Feb 2006
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    Perth
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    Default Dust extraction from a belt/disc combo sander

    I finished modifying and refurbishing this sander a few months back but didn't do anything about dust extraction until now.

    So far I have opened up the belt port approx. doubling the cross sectional are of the port and added some 4" ducting to the end of the rectangular opening so that some flexy can be connected to it. I have also added some extraction to the disc as it had nothing before.
    At some stage I will plumb a length of 6" ducting over from the main line but up until then I'll be using the 3 flexies attached to the BS which is nearby.
    Dust extraction from a belt/disc combo sander-ports-jpg

    The belt old port (shown in the photo below) on top of the new one, was opened up by cutting the tapering end off with a bandsaw and a 100mm length of 4" ducting was heated with a hot air gun and pushed over the port to make the ducting conform better to the opening. The ducting is held in place with some short 3/16" bolts.
    Ideally 6" ducting would have been better but the gap between the hood around the end of the belt, and the belt is very narrow and until that is attended to there is little point in fitting bigger ducting
    Dust extraction from a belt/disc combo sander-beltport-jpg

    The sanding disc is a bit trickier as the gap between disc and the steel post that supports the work table is restricted to using 4" ducting.
    The ducting I used for this was comms channel ducting. This is a bit sturdier than Sewage or storm water so it can better take the brackets made out of galvanised angle.
    The suction direction is deliberately designed to follow the direction of rotation of the disc.
    The other end is deliberately kept open to aid in maintaining the CFMs
    Dust extraction from a belt/disc combo sander-discport-jpg
    Here is another shot from underneath and you can see how the brackets hold the ducting in place
    Dust extraction from a belt/disc combo sander-discport2-jpg

    How does it work? While it's better than nothing by a long way, it does need more work.
    The belt hood needs access to more air, and some coarse dust does spill out onto the disc work table.
    Using the particle counter I found I could keep an adequate lid on the overall level of fine dust in the shed while sanding by opening the 6" lathe hood which is just across the alley way from the sander.
    I will post more as things develop.
    Attached Images Attached Images

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  3. #2
    Join Date
    Oct 2004
    Location
    Melbourne, Australia.
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    1,268

    Default

    Bob, very impressive, especially the sanding disc. I was around a friend's place the other day and we discussed how to eliminate, or at least drastically reduce the dust from his disc sander.

    His belt sander is done like yours, but not as well, perhaps we will enlarge the opening as you have done by cutting the reducing part of the original outlet.

    I take it that the slot part goes all the way into the end housing, which I'm guessing is a 22.5 degree angle joint?

    Simple solution and will see a better result than what we had thought about doing.

    Mick.

  4. #3
    Join Date
    Feb 2006
    Location
    Perth
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    27,756

    Default

    Quote Originally Posted by Optimark View Post
    Bob, very impressive, especially the sanding disc. I was around a friend's place the other day and we discussed how to eliminate, or at least drastically reduce the dust from his disc sander.
    Thanks Mick.

    His belt sander is done like yours, but not as well, perhaps we will enlarge the opening as you have done by cutting the reducing part of the original outlet.
    Don't forget that air also has to be able to get in to be able to get out.

    I take it that the slot part goes all the way into the end housing, which I'm guessing is a 22.5 degree angle joint?
    Yep, slot goes to the end.
    They are 2 x 45º bends at the end
    One thing I need to do is smooth and round off all the edges and maybe even put a small bell mouth on the open end, all of which should improve the flow

  5. #4
    Join Date
    Mar 2007
    Location
    Bonny Hills, NSW
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    64
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    517

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    BobL,

    another great post. I also especially like the sanding disc. It is a bit more thinking outside of the square.

    thanks

    Mick

  6. #5
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    Feb 2006
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    Perth
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    Here you can see the slot to the end and a closer up picture of a bracket.

    Dust extraction from a belt/disc combo sander-slot-jpg

    Dust extraction from a belt/disc combo sander-bracket-jpg
    Attached Images Attached Images

  7. #6
    Join Date
    Oct 2003
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    Canberra
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    47
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    Default

    Thanks Bob. Great post. I'll watch further developments with keen interest. I've got a linisher too, and the current dust extraction is hopeless. Not sure why they even put a port on the back.

    Trav
    Some days we are the flies; some days we are the windscreen

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