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Thread: Another new shed build
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24th July 2019, 03:20 PM #46.
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The prop type units can over estimate the flow by up to 50%. I would not even used them as relative measures of air flow as air flow in DC systems is typically non-uniform across the duct and very sensitive to to position of the sensor. Using the prop type units for decision making can lead to decisions that can make things worse.
There's more detail i n DRAFT: FAQ - Dust Extraction (Practical Aspects) if you need it.
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24th July 2019 03:20 PM # ADSGoogle Adsense Advertisement
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24th July 2019, 05:03 PM #47Woodworking mechanic
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If you create a jig that will hold the propellor unit at the same position at the pipe mouth and 90o angle, you will get repeatability. Sure the readings may not be accurate but they will be repeatable so comparisons can be made.
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24th July 2019, 10:38 PM #48Senior Member
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24th July 2019, 10:40 PM #49Senior Member
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24th July 2019, 10:46 PM #50Senior Member
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Just read the link provided by Bob. Looks like I have blown $30. No real harm done. I will still see if I get any significant differences when opening ports & using Lappa's suggestion to knock up a jig which may give some comparative results, albeit inaccurate readings. I worked out a while ago, that perfection is not an option, but it would be good to make the best of what I have.
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24th July 2019, 10:52 PM #51.
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25th July 2019, 04:17 PM #52Senior Member
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Haha, yep I learnt that already. Nearly lost the anemometer down the pipe. When things happen, they happen quickly.
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25th July 2019, 05:15 PM #53.
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A couple of my attempts at turning have been shredded by my DC. I screen of some sort can help.
I'v been using mesh guards like this 25 x 25 mm SS mesh in front of my sander and lathe BMHs.
Here you can see two guards, and inner and an outer - it doesn't look like it but it is the same size mesh..
The inner guard reduces flow by ~4% while the outer one (being in slower air flow) one;y reduces flow by ~1%
lathenew.jpg
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8th September 2019, 03:55 PM #54Member
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Really enjoying the ongoing DC discussion here, very informative. Time permitting, keep it coming Baddabing.
Cheers.
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13th September 2019, 03:27 PM #55Senior Member
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I have been progressing slowly, am putting on a patio at the moment, so not much free time. I have gotten a bit more done on the ducting etc, and will post some pictures on the weekend. But i have a question. I received with my dusty a 3 hose attachment, which I removed so and hooked up 6" directly to the machine.
I was thinking of using this attachment to run 3 x 4" hoses to my band saw, so I have 1 hose above the table, 1 hose below the table & 1 hose into the port on the bandsaw body. Is this a crazy idea that won't work? Here is a photo of the port. It would of course be connected to the 6" ducting run to my bandsaw.
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13th September 2019, 03:31 PM #56Senior Member
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15th September 2019, 10:26 AM #57Senior Member
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Ducting so far...Duct work.jpg
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15th September 2019, 10:28 AM #58Senior Member
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Sander with port removed. Sander post (2).jpg
Last edited by Baddabing; 15th September 2019 at 10:37 AM. Reason: put up twice
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15th September 2019, 10:42 AM #59Senior Member
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The sander is a cheapie but works quite well. The 2" dust port was useless. The dust was supposed to follow the belt down, with a vac attached to suck. All that happened was the dust flew everywhere, and what dust did get down just clogged up. So I removed it all so the DC had a chance to capture. Snder pre.jpg
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15th September 2019, 10:46 AM #60Senior Member
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I had a big gulp, so cut out the 4" and modified to 6". Added 6" pvc pipe and fibreglassed it in. On the inside, I formed as good a bell mouth as I could. It works extremely well, and all dust seems to get sucked up. I sanded a 6" scrap circle of mdf down to about half, with no dust anywhere around the sander. A massive improvement.
Gulp 1.jpg Gulp2.jpg
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