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5th April 2024, 04:09 PM #1SENIOR MEMBER
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And so the new dust collection installation begins
I'll update this thread as I go, but it's going to drag out.
I've read lots of stuff mostly authored by BobL, who has also kindly and patiently answered my questions despite them no doubt being answered already several times in various threads.
This upgraded installation will be better than I have now, but not perfect. Can dust collection ever be perfect?
I would like to measure the intake now and then later with the new line, but don't know how to do that.
Currently:
I have a 20 year old, two bag 3hp DC. It seems to work well.
Connected to it in a 7m straight line at knee height are a table saw, router small thicknesser and band saw.
There are never two machines operating at once.
Currently, the line feeding it is undersized and I'm getting leakage especially from the table saw.
The plan:
1. I'll be using 150mm ducting as far as possible.
2. Flex will be minimised.
3. Tight 90 degree bends will not happen - I was not able to get the more gentle 90 degree bend in 150mm, so I'll be using 2 x 45s.
4. I'll be making gates and one of the photos is a mock-up for me to play with proportions.
I spent $383 on the PVC this morning - including a 6m length. And that was the trade price.
I also spent $225 on some 160mm and 50mm flex - bought more than I will need - which will show up in a week or so.
(The photos are of course on their side despite being the right way up on my phone and desktop.)
Scott
Dust 1.jpgDust 2.jpgDust 3.jpg
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5th April 2024 04:09 PM # ADSGoogle Adsense Advertisement
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5th April 2024, 04:49 PM #2.
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Dust collection usually obeys the law of diminishing returns.
eg Spending $X will get you say 90% of the way there. To get to say 99% you have to spend 10$X and to 99.9% will need 100$X
There are situations (not in wood working) where say 99.9999% of the way is required. An example of this working with radioactive or highly toxic dusts. This is usually achieved using 99.999% efficient HEPA filters and working in space suit type lab wear.
Trying to measure DC air flow is fraught with problems, so unless you are a nutter like me, chances of getting ay sort of accurate measurement is not usually worth the effort.
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8th April 2024, 10:59 AM #3SENIOR MEMBER
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10th April 2024, 05:57 PM #4SENIOR MEMBER
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Got the flex.
5m of 160mm that fits nicely over 150mm PVC. It looks and behaves like a giant slinky.
And 3m of 50mm to draw from the guard over my table saw.
The plan is to use the flex for runs as short as possible, so I have more than I will likely need.
$223 in total.
Blast gates next.
Slinky.jpg
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11th April 2024, 03:13 PM #5
What sucker are you using on the 50mm off the tablesaw guard?
H.Jimcracks for the rich and/or wealthy. (aka GKB '88)
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11th April 2024, 04:16 PM #6SENIOR MEMBER
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11th April 2024, 08:00 PM #7.
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50mm hose connected to shop vac is better than nothing. You will get better performance if the guard is modified such that the collection point is in front of (not behind the blade) Lappa made a decent one a few years ago.
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11th April 2024, 08:27 PM #8SENIOR MEMBER
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Thanks Bob. I just did a search for Lappa and no luck. I'll have another look tomorrow.
My table saw is a K3 Hammer. Lovely thing, but throws a bit of dust around - the collection point is behind the blade. I have a shop vac connected to it now but I'm hoping connecting it to the 150mm line will be better. We'll see.
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12th April 2024, 09:39 AM #9.
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12th April 2024, 10:15 AM #10SENIOR MEMBER
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18th April 2024, 02:14 PM #11SENIOR MEMBER
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Gates are made.
Photos are sideways of course.
Sure, they're not very attractive, but I made them from scraps that have been hanging around for ages.
They accomodate the 150mm pipe and will be bolted to the floor.
Those flanges provide a good seal.
Gates 1.jpgGates 2.jpgGates 3.jpg
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26th April 2024, 03:08 PM #12SENIOR MEMBER
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Done.
I'll probably have a beer and a dedication ceremony to BobL on the weekend.
The things I did inspired by BobL's posts:
- 150mm PVC.
- Home made gates that the PVC fits inside to maximise flow.
- No sharp turns - 45 degree bends used in series for the two turns I had to make (from the DC and the TS).
- Minimal flex - 1 metre of150mm flex goes to the router, thicknesser and bandsaw.
- Hard connection to the table saw - the biggest dust culprit.
- 50mm connection between the saw guard and main line.
Dust line finished 1.jpgDust line finished 2.jpg
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26th April 2024, 05:50 PM #13.
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Good work! Its very satisfying to get it all up and running.
One caveat.
Initial testing did show 2 x 45º as marginally better than a 90º, but in ~2017 I did some further testing I found 2 x 45º was about the same as a standard 90º and significantly worse than the large radius 90º bend.
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26th April 2024, 07:31 PM #14SENIOR MEMBER
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27th April 2024, 11:31 AM #15
Does anyone know if the orange 150mm electrical fittings attach to 150mm DWV PVC pipe?
247P150 Conduit Bend Large Sweep 90deg Pvc 150mm Electric OrangeStay sharp and stay safe!
Neil
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