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  1. #106
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    Yes Bob, I think I've been incorrectly imagining a stream of air being drawn from the air intake across to the suction port and the dust has to fall into that stream to be removed. I understand from your comment the vents just let air in so the dust port can draw dust from the whole cabinet space more generally.

    I like the idea of mesh over the holes, and I'm thinking I'll raise the air intakes up a bit off the false floor level just so there's a lip to stop dust at the bottom from getting out too easily.
    The time we enjoy wasting is not wasted time.

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  3. #107
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    Just looking at it this morning I'm thinking 2 holes @ 150 x 100 gives me the same area as 3 x 100 square. One rectangular hole either side of the brand name plate, vertically parallel to the sides.
    The time we enjoy wasting is not wasted time.

  4. #108
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    I think four 4" holes with bell mouths would be better. You could mount 2 up high if there isn't room across the bottom. Might look cool having a row of stacks in front of the saw. They sell 6" too.

    https://www.parts-express.com/speake...lared--260-403

    There is likely a similar seller in Australia or nearby China.

    Pete

  5. #109
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    BMHs are only really significant when the air flow is high while the gains at low air speeds are minimal to insignificant. If the openings in the cabinet are big enough then BMHs are not needed.

    I think a 6" duct to a BS cabinet is a bit of a waste of suck.
    Relatively little fine dust ends up in the cabinet (especially if an under table extraction point is used) so high air flows are not need, just enough to clear the sawdust.
    If I was to put a 6" extraction point on a BS I would put that under the table.

    If BS extraction is being fed by a single 6" duct then at most there will be about 1200 CFM to play with. This is why 3 x 400 CFMs (3 x 100mm) ducting is often employed.
    One of these under then table
    One to the lower cabinet
    The spare one is used by BP attached to the upper band guides.
    This is because the natural wood cutting action warms the air and fined dust so it has a tendency to rise upwards, plus downward movement of the band drags air with it and the air bounces off the table top and reflects back upwards carrying fine dust with it.

    Another useful location is here Improving machine cabinet dust ports

  6. #110
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    Haha, wow they do look good. I wonder what the internal radius is on the flare. I've decided to go with the two rectangular holes for now, it's all marked out and ready to go. I don't want to reduce the solidity of the cabinet any more than I have to and the two holes looks good.
    The time we enjoy wasting is not wasted time.

  7. #111
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    Quote Originally Posted by BobL View Post
    BMHs are only really significant when the air flow is high because the gains at low air speeds are minimal. If the openings in the cabinet are big enough then BMHs are not needed.

    I think a 6" duct to the cabinet is a bit of a waste of suck.
    Relatively little fine dust ends up in the cabinet (especially if an under table extraction point is used) so high air flows are not need, just enough to clear the sawdust.
    If I was to put a 6" extraction point on a BS I would put that under the table.

    If BS extraction is being fed by a single 6" duct then at most there will be about 1200 CFM to play with. This is why 3 x 400 CFMs (3 x 100mm) ducting is often employed.
    One of these under then table
    One to the lower cabinet
    The spare one is used by BP attached to the upper band guides.
    This is because the natural wood cutting action warms the air and fined dust so it has a tendency to rise upwards, plus downward movement of the band drags air with it and the air bounces off the table top and reflects back upwards carrying fine dust with it.

    Another useful location is here Improving machine cabinet dust ports
    Thanks Bob, so when you say 6" duct to cabinet is a waste of suck you are talking about the bandsaw cabinet, not the table saw cabinet?
    The time we enjoy wasting is not wasted time.

  8. #112
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    Quote Originally Posted by 3 toed sloth View Post
    Thanks Bob, so when you say 6" duct to cabinet is a waste of suck you are talking about the bandsaw cabinet, not the table saw cabinet?
    Yes - I will fix it in the above post.

  9. #113
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    Quote Originally Posted by 3 toed sloth View Post
    Haha, wow they do look good. I wonder what the internal radius is on the flare.
    The 4" ones look OK but I'd like to know the OD/ID measurement of the straight part. If its 4" OD then I will keep making mine if its 4" ID then they will be fine.
    The 6" ones don't look that good so I will keep making these.

    I've decided to go with the two rectangular holes for now, it's all marked out and ready to go. I don't want to reduce the solidity of the cabinet any more than I have to and the two holes looks good.
    If the mesh was sturdy enough and attached in enough places to the cabinet, the cabinet would retain its solidity easily enough.

  10. #114
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    Bob the descriptions or answer questions say 4"ID and 6" ID for the two ports so they may fit up to PVC or may need the OD built up. One of the connecters to make the tube longer says 6 1/8" id so the port would be the same. They may not be as strong but that would depend on the plastic they are made of. They just say impact resistant. One man's "Boy these are tough" is another man's "Flimsy junk".

    Pete

  11. #115
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    Holes cut into cabinet, turned out really well. Cabinet still seems really solid. Intake holes are 100mm x 150mm.

    Also ran the DC in the enclosure with the baffle box venting outside and the bandsaw operating. Standing a metre from the front of the DC is showing 65dB, a great result, I couldn't be happier with that, and the suction at the bandsaw is much better also.
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  12. #116
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    Quote Originally Posted by QC Inspector View Post
    Bob the descriptions or answer questions say 4"ID and 6" ID for the two ports so they may fit up to PVC or may need the OD built up. One of the connecters to make the tube longer says 6 1/8" id so the port would be the same. They may not be as strong but that would depend on the plastic they are made of. They just say impact resistant. One man's "Boy these are tough" is another man's "Flimsy junk".

    Pete
    '

    Thanks Pete, They are made of ABS plastic which is fine.
    The 6" ports are US$10 if you buy more thane, so AU$14 plus shipping, can't imagine that being all that cheap.

  13. #117
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    Made the bell mouth housing out of MDF layers. Used some 150mm metal round downpipe to connect the hose, it fits nicely inside the ducting and the hose without reducing the ID too much.

    Connected up the TS and ran the DC and plenty of suction! The noise of the air pulling through the hose and TS is now about 73dB, louder than the sound of the DC running in the enclosure @65dB.

    I can really feel the air pumping out of the vent opening, but the noise isn't coming out so the baffle box is a great success.
    Attached Images Attached Images
    The time we enjoy wasting is not wasted time.

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