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Thread: Welding fume extraction
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2nd Jul 2020, 09:41 AM #16Member: Blue and white apron brigade
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Good to hear you have good flow.
Watch out for sucking in stuff.
As well as mangling stuff that is sucked in it can also mangle/unbalance the impeller and they can be VERY difficult to recover and then run at full speed.
Unless you have the inlet well out of the way ie above head height I'd be putting a bit of mesh over the inlet.
I use a 3mm thick x 25mm square SS mesh on my low down extraction inlets.
Initially I used galv weldmesh but the grit abraded away the galv and then the steel rusted - every time i used it, the rust disappeared but then so did the mesh.
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2nd Jul 2020, 09:44 AM #17Most Valued Member
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2nd Jul 2020, 10:05 AM #18Most Valued Member
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Welding fume extraction
Thanks guys - will definitely mesh the inlet. Don’t need a “please explain” over a missing grandkid
I’ll need to find somewhere to source a 200-150 reducer too.
Steve
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2nd Jul 2020, 12:31 PM #19Most Valued Member
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2nd Jul 2020, 12:40 PM #20Member: Blue and white apron brigade
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PVC reducers from 200 to 150 mm are pretty rare but reducers are very easy to make.
On the input side it doesn't matter if it leaks - all the air is being sucked away.
One of the nicer materials to make transitions out of is the SS from clothes drier drums.
Here's a complicated one I made a few years ago.
https://www.woodworkforums.com/f200/...-issues-204634
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2nd Jul 2020, 12:55 PM #21Most Valued Member
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common in the AC industry BobL
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2nd Jul 2020, 02:23 PM #22Most Valued Member
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200 and 150 are common sizes in reticulation plumbing, generally for large stormwater applications. PVC reducers to mate them are also available quite readily.
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2nd Jul 2020, 03:52 PM #23Member: Blue and white apron brigade
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2nd Jul 2020, 09:53 PM #24Most Valued Member
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2nd Jul 2020, 10:30 PM #25Most Valued Member
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Now there's an idea....Just happens to be one chugging away in the next room at the moment
Probably simple enough that I could even manage to draw it up myself too.
I'll have a ring around and see if I can buy one off the shelf, but if I don't have any luck I'll give printing one a go.
Steve
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4th Jul 2020, 01:32 AM #26Most Valued Member
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https://www.pureventilation.com.au/b...c-200mm-150mm/
At $11ea I reckon I’d be tempted to forget about the 3D printer
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4th Jul 2020, 09:08 AM #27Member: Blue and white apron brigade
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Thanks for the lead on that website - some interesting products there.
RE: reducer
I agree the price is right - the cost of 3D printer filament is something a lot of people forget about.
Minor point but a tapered reducer would be less resistive to flow.
According to the Loren Cookbook a stepped reducer of that area ration will reduce flow by the equivalent of adding 10m of ducting.
Won't make much difference at AC air pressures but for fume ventilation it all adds up.
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4th Jul 2020, 09:56 AM #28Most Valued Member
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Welding fume extraction
Thanks for that website. Haven't checked out what their freight is like but the item prices seem pretty reasonable.
They have this tapered reducer for a few more dollars too https://www.pureventilation.com.au/b...r-200mm-150mm/
The black plastic reminds me of the cheap toilet plungers, but hey - if it does the job...
One slight issue is that when I actually measured it, its 225mm. Nothing a bit of duct tape won't sort out.
Re the 3D printing:
I had a play yesterday in the background while I was "working" from home. Design was easy in Freecad, just a simple sketch and rotated, but I found actually printing something of that size and small thickness (1.6-3mm range) is a completely different animal to relatively solid items in the 75-100mm cubed range.
I'd done a few test rings etc to get settings correct for the PETG that I was playing with, but left this one printing when I went to bed.
I'll have one more crack out of PLA just for the learning experience, but I'm not confident.
Steve
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4th Jul 2020, 10:31 AM #29Member: Blue and white apron brigade
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I believe its called "my first blob", yes I've had more than one.
Mine is too small to do anything useful and I leave it to my son who has several printers and knows how to drive them properly.
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5th Jul 2020, 09:35 AM #30Most Valued Member
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Welding fume extraction
Like waiting for a baby to be born, but finally it’s here:
Definitely pushing the build envelope for the printer!
I wouldn’t recommend it for something this size - not worth the time, filament etc if you can easily buy something off the shelf. I did it more from a learning perspective.
If anyone is interested the filament was Sunlu PLA+
Steve
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