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28th May 2008, 08:58 PM #16.
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Jake,
This is how I would do it if I were you;
Most people don't understand that fans are much better at sucking (especially the fine) dust than blowing it. The problem with the blowing idea is that most air speeds are way too high and this causes turbulence and sprays the fine stuff all over the place. It doesn't look or feel as good anywhere near as good as a fan blowing on you and it won't clear away the big chunks but don't be fooled by what you see, the big chunks don't matter a hoot, it's the fine stuff that matters.
This is why in the first instance I would keep the door partially closed and put the fan at "A".
A much better idea would be to cut a hole in your shed at B and mount a big sucker there and open the window opposite to create a cross draft that puts clean air on you and sweeps the fine dust immediately out of the shed. Once again it won't look or feel as good but it will be be much better for you.
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28th May 2008, 09:06 PM #17woody
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Gidday I use one of the cheap gmc extracters and pull all the air through a 44 gallon drum into the machine That way only dust goes through the machine and even that is only25 % and if perchance a bit of rag goes up the chute it doesnt cause an expansion of the fan case 4 inch sewer pipe the length of the shed with a couple of midpoint Ys and push on bungs for those not in use and 100mm dropper to lathe with small gulp and 3 inch to planer & table saw and 2 inch to band saw and slide/compound mitre saw and works well when www remembers to turn everything on before starting work {richard cranium at times ] Whole lot for under $250.00 so go for it Regards WW Wally
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28th May 2008, 09:23 PM #18.
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29th May 2008, 09:16 AM #19
thanks Bob. I don't know if I would cut a hole in the wall. but maybe if I put the lathe at the windows at the other side of the room and put a pedistal fan right on the window in front of the lathe.
finding dust extraction really complicates things. and will loose a hell of a lot of space organising it all. Really would be quite happy with the simplicity of dust and shavings just dropping to the ground and just sweeping onto a board and dumping in a bin. There's enough machines as is to maintain.
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29th May 2008, 10:14 AM #20
My Air cleaning system
I don't wear a dust mask, because I have a beard and they won't work. I can't afford a Triton. I wear a face shield only. This pic is a drawing of my shop. The Pedestal fan blows across my lathe, towards the exhaust fan that blows out the window. Air flows in through the doors, and out the window with the exhaust fan. The air cleaner is about 42 inches above the headstock of my lathe. Until I made my air cleaner, I always had sinus trouble, and my nose was always clogged. Since then, I've had no trouble at all. With the lathe lights on, you can't see any dust in the air, and you can't see any dust in the sunlight shining in the windows in the end of the shop.
Al
Some minds are like concrete thoroughly mixed up and permanently set.
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29th May 2008, 11:56 AM #21
Jake
As you know, I don't do much turning and so I haven't given much thought to dust extraction from it, but I have always found that machines tend to make dust which lingers while most hand tools make shavings or chips that fall to the floor (only sawing and sanding make dust and then much less than power sanders or saws).
So I would have thought that the major risk with a lathe is the fine dust when sanding and big chips coming off when roughing. A face shield is needed for the second category (and prolly a leather apron as well).
As for the dust, I reckon it's less of a problem for a lathe and a fan by the windo should be a good solution. It is different if the reason for the collection is not to capture dust for health reasons but to capture chips and shavings for tidiness. But for that i agree with you and just sweep up after a session.Cheers
Jeremy
If it were done when 'tis done, then 'twere well it were done quickly
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29th May 2008, 03:11 PM #22
Boss is wrong!
I have a copy of a 1998 doctoral thesis from the School of Public Health and Community Medicine, Sydney University, titled "OCCUPATIONAL EXPOSURE TO WOOD DUST" that documents the health hazards of working with wood. It's too big to post here, but happy to forward to it to you as an PM/email.
Also, have a look at this page BillPentz.com :: Dust :: Medical Risks.
I agree with Skew about dust collectionn around the lathe.
Keep healthy!
NeilStay sharp and stay safe!
Neil
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30th May 2008, 08:24 AM #23Senior Member
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The page I wanted to add was also just a bit too long, thats why I started another thread and linked to the doc...
Here it is again.
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<!-- / message -->
</TD></TR><TR><TD class=alt2 style="BORDER-RIGHT: #d6d6d6 1px solid; BORDER- #d6d6d6 0px solid; BORDER- #d6d6d6 1px solid; BORDER-BOTTOM: #d6d6d6 1px solid"> <SCRIPT type=text/javascript> vbrep_register("745165")</SCRIPT> </TD><TD class=alt1 style="BORDER-RIGHT: #d6d6d6 1px solid; BORDER- #d6d6d6 0px solid; BORDER- #d6d6d6 0px solid; BORDER-BOTTOM: #d6d6d6 1px solid" align=right><!-- controls --></TD></TR></TBODY></TABLE>
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30th May 2008, 10:43 AM #24.
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Al, the pedestal fan may look like it clears the visible dust away from you but will also spray considerable superfine dust all over your shed - so while the exhaust fan is trying to draw the superfines out of your shed your pedestal is continually spraying some of the fine stuff in the opposite direction. Think of it like this. You're standing at one end of a swimming pool and someone next to you is continually peeing in the water. At the other end of the pool a pump is filtering the water but someone has put a propellor in the pool that points towards the pump but also ends up stirring the pee through the pool
Don't worry about the dust you can see with the lights or the sun. It may be better for your health to put the pedestal fan poking out the other window so there is a continual and constant flow away from the lather towards the direction of the windows. The situation won't look anywhere near as good since there will be more visible dust hear you but the superfine dust will clear the shed quicker this way and your air cleaner won't have to work as hard to clear the shed
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30th May 2008, 09:49 PM #25woody
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Its at the far end with the bag out a door under cover and the amount of dust on things out there is jack because if you go into the drum at 100 mm and come out through 2 x 90 mm the suction of solids is reduced dramatically and she works just gr8 Regards WWW
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26th April 2018, 12:08 PM #26
Hi Bob
This is not really a reply but a question. You mention a few DC points at your lathe? Our club is currently ready to install a full shop system and are wondering how effective the lathe hoods really are? I have tried a big gulp at home on my mini lathe and found it next to useless. However i was only using a single bag carbatec collector. Do you have any pics of your setup? We are having floor sweeps setup close by as that seems to be where most of the chips end up.
Cheers
John
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26th April 2018, 02:10 PM #27.
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A single bag CT collector with a 100 ducting will draw about 300 CFM which is less than 1/3rd of what is needed to capture fine dust produced by small to medium scale turning.
A big gulp on the end of a 100mm duct is a bit like putting a large outlet on a narrow watering hose and expecting more water to come out.
You need at least a 3HP DC with 150 mm ducting all the way through to the DC.
Keep teh ducting as short as possible
Use stiff rather than flexible felly hose and use minimum lengths of flexy (<0.5m)
The DC should be outside the workshop or inside an airtight enclosure in the workshop with the enclosure vented outside the workshop
My setup is below.
Big gulps are better than nothing but even better are these Bell Mouth Hoods that you can see I use a lathe to make them out of PVC pipe - theres a long thread on these in this forum
IMG_1878.jpg
Here's a short vid to see how it works
My setup is far from perfect.
There are still heaps of chips everywhere albeit instead of scattering them to a distance of about 4m that is reduced to about 2m, but short of slipping over on them they can't hurt you like the fine dust.
However my particle counting systems tell me I can work all day at my lathe and provided I have my DC running I am exposed to the same amount of dust that is in the air outside my shed.
Here is another shot of the setup.
Note how short the flexy is - it's just long enough so I can position the Bell Mouth Hood up and down the bed of the lathe as needed.
IMG_2954p.jpg
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