Results 106 to 117 of 117
Thread: DC enclosure and ducting set up
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14th June 2019, 10:41 PM #106
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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15th June 2019, 06:58 AM #107
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.
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15th June 2019, 08:17 AM #108GOLD MEMBER
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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
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15th June 2019, 09:44 AM #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
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15th June 2019, 09:46 AM #110
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.
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15th June 2019, 10:00 AM #111
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15th June 2019, 10:43 AM #112.
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15th June 2019, 10:47 AM #113.
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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.
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15th June 2019, 11:57 AM #114GOLD MEMBER
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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
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15th June 2019, 01:17 PM #115
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.The time we enjoy wasting is not wasted time.
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15th June 2019, 06:36 PM #116.
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15th June 2019, 07:42 PM #117
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.The time we enjoy wasting is not wasted time.
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