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Cyclone rated volome

5/16/13       
Mark Koons Member

I don't know how to search for information about how many cubes a 7-1/2 Hp Torit cyclone supposedly draws. Nordfab's ductwork site says... no, I infer from it, that a 10" inlet ( the Torit intake size) is designed to handle 2,500 cubic feet per minute. Can anyone direct me where to look for what I obviously don't know?

Actually, I don't have much luck searching this site on any topic. I think it has to do with improperly guessing the magic words. Does anyone have any tips how to search Woodweb?

What is the relationship between static pressure and cfm?

Is there any merit in retrofitting an old 12/14 table saw that has a 4" cabinet dust port with a 5 or 6" dust port?

In posting these questions, should these be separate topics?

5/16/13       #2: Cyclone rated volome ...
JR Rutter  Member

Website: http://www.harmonicdesignworks.com

Here is a link that will answer some of your questions. The 7.5 HP is a model 24.

Static pressure is inversely proportional to flow rate.

Yes, you will get better dust collection on an old saw if you upgrade to a larger port and duct.

Donaldson/Torit cyclones

5/17/13       #3: Cyclone rated volome ...
JeffD

The 7-1/2hp Torit is rated 1950 - 3500 cfm's at a static pressure of 13.4 - 4.4 and an inlet velocity of 3580 - 6450 fpm based on clean filters. I can't help you much with the techno lingo, but I can tell you it will suck your skivvies off if you get too close:>0

Seriously though this collector moves a LOT of air. I have my system set up so the 8" line to my table saws is un-gated. The rest of the machines have gates and I can easily run 2 other machines without any apparent loss in performance.

I think 4" is too small for most machines. My table saws have 5" on the bottom with an additional 3" at the guard. Planer and jointer both have 6", and the shapers have a 6" main that downsizes a bit at the transition to the hood.

hope this helps,
JeffD

5/17/13       #4: Cyclone rated volome ...
Mark Koons Member

Thanks, guys. You've confirmed my suspicions and I really need to get dust collection right in this new shop. I'll figure on re-porting my old machines and using larger duct than the factory ports suggest is appropriate.

My lungs are shot. A few minutes breathing wood flour makes me sick like the flu for several days. Pay attention, young puppies, dust damage to your lungs isn't an just an inconvenience you can attend to with a handkerchief or by snorting water in the shower.

This morning I've got a line on used Nordfab ducting and have to provide a material list to the owners. This stuff is about as good as it gets but it is too costly for the typical small shop. I need to get the design close as I can and I'd ask a Nordfab rep for a design but that doesn't seem right since I intend to buy used.

I've got a 40 year old Ramco 24" single head wide belt with a 6" port. I'm trying to design for future. Does anyone know what dust porting is typical of double-head 36" wide belts"?

5/17/13       #5: Cyclone rated volome ...
Curt Corum

Mark, Please see PDF attachments. One is somewhat of an explanation pertaining to static pressure or resistance to flow. Other is Torit Model 24 sheet that gives CFM delivery at 4 different levels of resistance. A typical external static pressure when a Model 24 is plumbed into a shop with approx 50' main line and branches running off main no more than lets say 10 to 15 feet, would be around the 10" level. The 2,460 delivered would divvy up between open branches. 3, 5" diameter branches at 550 CFM each and 2, 4" diameter branches at 350 CFM each totals 2,350 CFM. That is just one example of a combination of diameters and coinciding volumes that is close to the total CFM delivery. I hope this info helps.

Curt

Click the link below to download the file included with this post.

Torit.pdf


Click the link below to download the file included with this post.

What_is_Static_Pressure_2.pdf

5/17/13       #6: Cyclone rated volome ...
JeffD

Price both types of ducting out....spiral and Norfab. Brand new the spiral is cheaper but buying used you may do better. Also keep on the lookout for regular spiral from shops closing. I bought a trailer full of ducting for next to nothing a couple years back. I kept about half that was usable and scrapped the rest. If only I had found it before I did the bulk of my system!

JeffD

5/17/13       #7: Cyclone rated volome ...
JR Rutter  Member

Website: http://www.harmonicdesignworks.com

Double 36" sander is probably anywhere from 4ea x 4" ports to 2ea x 6" ports, depending on manufacturer. Depending on options like air jet belt cleaners or panel cleaning brush, there may be additional ports.


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