Thread: Invisible Dust question....

not sure. don't quote me. but I think your odds of ensuring theres enough sucking force to break the reactive inertia involved in dust creation to be only calculable after actually consuming enough dust to cause moderate chest pain. But this chest pain will be hard to measure. Because its dependent on the individual. ie. weather or not he smokes. weather or not he's not the complaining type. constipated or not …just not sure . What we need is a professional to tell us. Someone who really knows how to use an adjective. Someone, because of his age, experience, and education, has possession of the full story at any one moment. uno what I mean.

one thought I have had (well I have to at least have one thought with anything with a closed cabinet is:
- so I don't reduce the suck right where and when it is cutting and get the best suction for the escaping dust I would have a separate blast gate for the cabinet and basically turn it on full steam afterwards. This way I don't have to share my suction. I don't expect this to be perfect as some of the shavings would have settled but if the really fine dust acts more like air then I should be able to pick this up afterwards. What I'd really like for this is some method to switch the blast gates like with a voice command or a 'google glasses' where I just look at it and it turns on!!!
cheers
Mick

Originally Posted by mick59wests

one thought I have had (well I have to at least have one thought with anything with a closed cabinet is:
- so I don't reduce the suck right where and when it is cutting and get the best suction for the escaping dust I would have a separate blast gate for the cabinet and basically turn it on full steam afterwards. This way I don't have to share my suction. I don't expect this to be perfect as some of the shavings would have settled but if the really fine dust acts more like air then I should be able to pick this up afterwards. What I'd really like for this is some method to switch the blast gates like with a voice command or a 'google glasses' where I just look at it and it turns on!!!
cheers
Mick

spose. ...

Originally Posted by apricotripper

... weather or not he smokes.(tick) weather or not he's not the complaining type.(tick) constipated or not (tick)…..

Hey Jake, I didn't know you knew Brett.

Brett, is this the precursor to a new lift/router table and router?

Nah, it's not new, just that other little jobbie I knocked up a couple of years or so ago.

US$425 will let you find out...
http://www.dylosproducts.com/dc1700.html

Cheers MS.

Jeez they're expensive aren't they? I guess that's why none of who should have them, have them. A classic example of a tool etc that needs to be in a local tool-pool for use every now and then.

Originally Posted by FenceFurniture

Cheers MS.

Jeez they're expensive aren't they? I guess that's why none of who should have them, have them. A classic example of a tool etc that needs to be in a local tool-pool for use every now and then.

day za vu…. I feel like I've already written to this quote already….

thats right I have. some other bloke who I've never met too () , has erased what I wrote. But I don't understand why exactly as I wasn't rude. I was just joking.

my mail thing says you said…. ' say what ?' ….to me saying….' I love you'. But I suppose that wasn't accurate. I'm sorry. I don't really love you, I was just saying that to comfort you/me. Maybe thats why it was erased, because he new that it was an insincere … ' I love you ' .

It was say what to the whole post, actually. I didn't know what you meant then, and I'm no wiser now.

Thats you and me whose wiser now ! …. thanks for your help. i love you.

how do you hug online ? …that'll be the next thing,,,, a cyber hug.

Visible dust capture is only a rough guide to fine dust capture.

An example of where the visible dust is captured but the fine dust not, is sweeping the floor of my shed.
I can sweep up every chip on the floor but it fills the room with fine dust.

Another example is vacuuming the floors in our house with the very expensive so called HEPA vacuum cleaner.
Floors look clean as a whistle after vacuuming but fine dust levels in air have risen considerably.

Fine dust is easily carried even by low speed air currents away from machines. If there is air moving around of away from a machine that is independent of dust extraction (e.g. use motors with fans for cooling or just the hot air rising from around a machine) then that is where the fine dust is most like to be. It is captured by moving large volumes of air from the source of the dust.

One way to think of fine dusts as a pong or smell. Your nose is a far better fine dust detector than your eyes, if you can smell the wood you are working on then the fine dust is not being collected. So one way to test you setup would be to use a wood that smells when it is cut/machined etc.

Chips moving at high speed are rapidly slowed down especially by high speed air flow such as closed to the mouth of a VC or DC inlet. Chips will slow down and fall out of low speed air currents moving away from a machine so they don't usually travel all that far, whereas fine dust will eventually penetrate to every corner of a shed. In most cases, to capture chips from a source relatively small volumes mounts of air moving at high speed may suffice which is why Vacuum Cleaners are often used on power tool with mixed success.

Example of where the visible dust is not captured but the fine dust is, is my lathe
Turning small/short spindles I end up with a significant amount of visible chips on the lathe/bench/floor but there are is no invisible dust (over and above external background) detected inside the shed
The high air volume being extracted by the 150 mm bell mouth hood is sufficient to capture all the fine dust being made.

High air volume flow "guarantees" fine dust removal, maybe not immediately but if your shed is not too large and your DC is not to small the fine dust can be captures within minutes of dust generation and that is why I advocate running a DC for some time after dust making activities.

2 x 50 mm and 1 x32 mm DC lines is only going to move about as much total air volume as a 32 mm VC line but the BIG difference is you are collecting from 3 problematic areas instead of one. So this may explain better chip collection but whether you are getting all the fine dust would be hard to say without testing.

Thanks for a detailed response Bob.

Jake, I really don't know where you are coming from here. I think you are indicating that I'm fussing unnecessarily over invisible dust. Is that right?

If so, then best to note that invisible dust fools us into a false sense of security, and this has a double whammy. Because we can't see it we think the room is clear of dust, and therefore take off the mask, or otherwise don't worry about it. The big danger here is that invisible dust is more of a problem the the visible because it is finer and can penetrate into lung tissue more readily.

So the finer more deadly dust that can't be seen is given an open road by taking off the mask.

Originally Posted by FenceFurniture

Jake, I really don't know where you are coming from here. I think you are indicating that I'm fussing unnecessarily over invisible dust. Is that right?

If so, then best to note that invisible dust fools us into a false sense of security, and this has a double whammy. Because we can't see it we think the room is clear of dust, and therefore take off the mask, or otherwise don't worry about it. The big danger here is that invisible dust is more of a problem the the visible because it is finer and can penetrate into lung tissue more readily.

So the finer more deadly dust that can't be seen is given an open road by taking off the mask.

I hear ya. Man WE are so on the same wavelength.

When we meet in person one day ( maybe we already have ?) I'll try and give you a big blokey hug. Which will be a big deal because, I don't like males much.

But then I probably won't remember this conversation….only sense some weirdness between us from the outset because you know who I am. And you'll probably get off on me not knowing who you are. Very exciting stuff. Empowering. you'll be able to prepare all day what you want to say when we meet. Have the upper hand Look forward to that day, if I remember.

I love you. xxx cough cough vomit cough (couldn't find the vomit smiley)