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  #1  
Old Wed 10 September 2008, 08:05
javeria
Just call me: Irfan #33
 
Bangalore
India
Blower Power

HI G' what the HP rating of the motor on your dust extractor? Does Sean use the same dust extractor for both machines , yup I have seen one of your's in the dust room - I am assuming you atleast use a dust extractor to clean the machine in the dust room.
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  #2  
Old Wed 10 September 2008, 09:44
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Only the one machine has a dust collector - the one in the room is soaked in dust.

The collector is the standard Chinese 2HP unit sold under many names and produced in slightly different flavours from more than one factory:


Our one was stripped down and got its motor/fan section turned horizontal and fixed to the wall.
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  #3  
Old Wed 10 September 2008, 11:12
javeria
Just call me: Irfan #33
 
Bangalore
India
I just ordered one to be built here cost me somewhere like 300USD for a 1 hp, I am asking him to revise it to 2 HP, it will be a good one bcos I am making the drawings for it.

The impeller back plate is 8mm mild steel plate 300mm dia and 3mm thick plates for the blades. The whole casing will be 1.5mm thk, the motor will also be a 2 hp indian make called LHP - all this bcos this is the company where I had worked earlier as a Design / erection / material /process engineer http://www.devakireinforcedplastics.com

and the whole setup will look something like yours!

RGDS
IRfan
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  #4  
Old Wed 10 September 2008, 11:47
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Okay Irfan, let's see if you paid attention during Fluid Dynamics classes . . . . . . .

Your "wheel" is 300mm diam, how "thick" is it? (how tall are the blades?). How many blades?

How did you calculate those two parameters? (the 300mm "feels" a bit small for 2HP at 2900rpm). Do you have a current meter (amp meter) to see if the wheel size is correct for the motor?

A typical approach is to make the wheel a bit too big so that it draws slightly too much amps, and then choke the inlet to drop the amps. If you weren't paying attention in the Fluid Dynamics class, you will believe that choking raises the amps.....it does not.
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  #5  
Old Thu 11 September 2008, 06:41
javeria
Just call me: Irfan #33
 
Bangalore
India
Gerald, you guessed right - I hated Fluid Dynamics - never got what it was into my head. Just read thru the text and memorised to get thru the exams.

I was just going by sizes of some of the standard blowers. The number of blades may be 6 and height of the blades would be around 60mm. I had a book with those calculations. I will let you know the exact next week.

Thanks for the hunting - it keeps us on our foot G'


Last edited by javeria; Thu 11 September 2008 at 06:44..
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  #6  
Old Thu 11 September 2008, 07:07
Gerald D
Just call me: Gerald (retired)
 
Cape Town
South Africa
Have a long lazy read of this long page http://billpentz.com//woodworking/cyclone/Blower.cfm to get a feeling of some of the things involved. Realise that Bill Pentz is from the the 60Hz world where motors turn faster than in our 50Hz world - we need bigger diameters.
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  #7  
Old Thu 11 September 2008, 09:28
javeria
Just call me: Irfan #33
 
Bangalore
India
Had been reading the website till now, the 14.5inch impeller has all the dims but rated for 5 hp, Will settle down for a 13.5 inch dia thats approx 350mm dia,

good reading, probably will drop the order the blower and build the cyclone instead, will cost almost the same.

Thanks G' I had almost forgotten about Bill's website.

I will use the calculator to determine the exacts.

RGDS
Irfan
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  #8  
Old Thu 18 September 2008, 10:15
liaoh75
Just call me: David
 
Taibao
Taiwan
I'm a bit embarassed to even ask but what would be the functional difference/benefit of the traditional dust collector vs cyclone?
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  #9  
Old Thu 18 September 2008, 10:49
domino11
Just call me: Heath
 
Cornwall, Ontario
Canada
As far as I know the cyclone will filter out more of the larger particles before it gets to the blower and final filter. Makes the final filter more efficient and easier to clean.
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  #10  
Old Thu 18 September 2008, 18:43
javeria
Just call me: Irfan #33
 
Bangalore
India
cyclone explained

Take a look at his site - you can do it on your own!

http://www.ablett.jp/workshop/cyclone2.htm
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  #11  
Old Thu 18 September 2008, 20:23
Doug_Ford
Just call me: Doug #3
 
Conway (Arkansas)
United States of America
David,

I believe my cyclone\dust collector filters out 1/2 micron dust. Have you been to Bill Pentz's site? You should be able to google it. Lots and lots to read. Greg J and I bought systems that were based on his design and I'm very happy with it. I believe Greg J is too.
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  #12  
Old Fri 19 September 2008, 16:47
Greg J
Just call me: Greg #13
 
Hagerman, New Mexico
United States of America
Extremely happy with my setup. Easy assembly and setup. So much air flow, that no front end is needed on my DC Foot when cutting MDF.

Cutting PVC is a different story. Hugh chips fly and a front shield is needed.
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  #13  
Old Mon 27 June 2011, 19:02
Red_boards
Just call me: Red #91
 
Melbourne
Australia
Looking at this 3HP dust extraction system

I'm looking at this system for dust extraction. It's actually under-specced according to info on Bill Pentz's site, but I can't afford the next size up (about 3x the price).
it's nominally a 3hp motor driving a 12" impeller, alledgedly moving 2800 ft3/min. If I'm cynical about published specs, I would say the motor is probably 2hp RMS and air movement 1200 ft3/min at the machine (rather than the extractor ports) which, together with the small impeller, means it's about minimum spec for a one-car garage workshop.
I'll get around to building myself a "proper" extractor a bit later.

http://ledamachinery.com.au/catalogu...products_id=50
There's also a smaller model, similar to the one Gerald posted earlier:
http://ledamachinery.com.au/catalogu...a8c3fde645a857

I'm considering building a dust room. This should help with cutting noise, too.
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  #14  
Old Mon 27 June 2011, 19:34
MetalHead
Just call me: Mike
 
Columbiana AL
United States of America
Shoot Build the whole extractor. You mentioned the God Father of dust removal so I am sure you spec'd it all out. Rad Racer built one.

Here

http://www.mechmate.com/forums/showt...92&postcount=1


Man have I said this week how much I love this site !!!
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  #15  
Old Mon 27 June 2011, 21:20
KenC
Just call me: Ken
 
Klang
Malaysia
I abide as much of Bill Penz's advise on dust management. Particularly the HP. What we really want is to protect our lungs from the fine dust which does the most damages. If you are blowing the air outdoor, you don't need the filter bags (yes, legally).
When I learnt that local dust collectors are going at around less than 400usd, I dropped the idea of building my own as a motor will cost about half of that locally...
When I shop for mine, I did specifically look for a 15" impeller with at least 3hp motor & a price tag which I can afford.
To keep heavy wood chips & other debris from getting to your fan impeller, You can also build a Thien separator in place of the real cyclone separator. I added an extra barrel for rotation, works wonders to keep the dust out of my lungs & every imaginable corners in the shop. takes only a few hour to build. http://www.mechmate.com/forums/showt...&postcount=349
If you are really strapped with cash, you can also build your own fan. The most important bit of the fan is the impeller. I do remember someone in this forum build his own fan impeller. Do check out Bill Penz's site, you can learnt everything there is in dust management.

Last edited by KenC; Mon 27 June 2011 at 21:23..
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