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Thread: Invisible Dust question....
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29th April 2014, 10:56 AM #16
Ah, well it wouldn't be the first time I've done that. Having dealt with Colen Clenton for a bit (but never met in person) I sidled up to him at the Sydney Show, muttering something about hearing that these "Squares" were in fact not. Certainly got his attention quick smart.
And for your future reference:
: puke :
: blowkiss:
" wacko :
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29th April 2014, 11:39 AM #17Retired
- Join Date
- May 2012
- Location
- Canberra
- Posts
- 1,529
Inscense
I had the same thoughts as BobL when I "made" my very crappy dust port for the lathe.
We have a habit of lighting inscense at home. I grabbed a stick and with the DC and lathe on (to create disturbed air) waved it around near and far.
It was really dramatic at how far the little DC I have did suck air from. It allowed me to fine tune the port. It visualised the air movement exceedingly well.
I did it next to my table saw. I ended up covering many holes with duct tape. Hardly anything gets ejected from the top of the blade and the suction creates a Black Hole Of Doom to suck it all down.*
I've found that since then (and building a box to shroud the router) my dust has fallen to nearly zero....and this was with an $80 second hand DC (H+F 1hp, 600cfm with a pleated cartridge)
* zero clearance inserts restrict this dramatically and I was thinking of experimenting with putting suction holes in the insert (small near the blade and large towards the edge.... Swiss cheese)
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29th April 2014, 12:18 PM #18
As a smoker, I have the advantage over you . I can actually give the smoke some acceleration in a different direction to the DE air movement - thus replicating the vagueness of invisible particle movement. I can still punch out one of those breath strength meter tube thingies to off the scale, so there's plenty of acceleration available.
No?
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29th April 2014, 03:09 PM #19
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29th April 2014, 04:26 PM #20
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30th April 2014, 10:08 AM #21
G'day Brett, I did some work some years back in a school woodwork class room and the teacher purchased two [2] big room filters which I mounted/hung from the ceiling to create a circular flow of air which was filtered through the large pleated filters on the units inlets.... may be an option for your shed??? Cheers, crowie
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30th April 2014, 10:54 AM #22
Yeah, I wouldn't mind putting in a microair (or whatever they are called) filter crowie.
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30th April 2014, 02:01 PM #23
....naaaa. get one of these MFP750_3.jpgPut it behind your work area and have it blowing out the door.
No inwisable dust or cats hangin round then.
Just rug up in winter.
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30th April 2014, 03:33 PM #24.
- Join Date
- Feb 2006
- Location
- Perth
- Posts
- 24,746
Room filters are ineffective at keeping up with dust produced by machinery but they will help clean up a room after a dust making activity has ceased.
Axial fans are in fact pretty hopeless at collecting up and pushing fine dust out of an opening. They simply will no blow invisible dust out of a doorway. They create severe turbulence and end up sucking back and reticulating a lot of their own air. As they are designed to recirculate air and not push it in a specific direction for long distances they are one way of guaranteeing that you wlll distribute fine dust all over your shed. If all you can afford is an axial fan it is better to make two big holes in the shed on opposite walls and put the fan in one hole blowing outwards - definitely not inwards. Not everyone wants to or can put such a big holes in their shed wall.
I have seen a number of these axial fans used by turners who think it is OK to just dilute the fine dust generated by their lathe into the rest of the shed. Remember, all it takes to exceed the far from best practice Aussie, OHS dust level is 1/4 of a thimble of dust! The only way to prevent this level accumulated dust getting into the air of a shed is to capture as much of it as possible at source and to run a DC for some time after the last dust making activity..