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Forum topic by sawdustjunkie posted 03-12-2016 02:07 AM 643 views 0 times favorited 6 replies Add to Favorites Watch
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sawdustjunkie

343 posts in 1178 days


03-12-2016 02:07 AM

I have the plastic model of the Super Dust Deputy hooked to a Harbor freight collector.
I am looking into getting a new dust collector and am wondering how much of a CFM loss you get with the Deputy hooked up to a collector.
I called Oneida today and asked that question. They don’t have an answer except to say yes there is a CFM loss when hooked up!
I simply want to get a higher power dust collector and use the Super Dust Deputy with it.
I know that the HF unit isn’t real 2 h.p. motor and that the impeller is only about 9” wide.
I am actually looking at the 3 h.p. Grizzly with the twin canisters, but I think I could get away with the 2h.p. one if I don’t loose too much cfm with the Deputy.

Any suggestions would help.

-- Steve: Franklin, WI


6 replies so far

View JBrow's profile

JBrow

817 posts in 381 days


#1 posted 03-12-2016 03:52 AM

sawdustjunkie,

I have no data and took no measurements – only my impressions from this experience. I had a ½” hp small impeller dust collector which came with a trash can base and a lousy filter bag (30 micron maybe?). I used the dust collector the way it came for a while and later set the impeller on top of a shop built cyclone. I continued using the trash can and filter bag after converting to the cyclone.

While the cyclone may reduce CFM, I did not notice any appreciable reduction when I added the shop made cyclone. Other components of the dust collection system will probably have more of an impact than the cyclone; such as dust work design, length of runs, number and angle of turns, the type and extent that flex hose is used.

When I shopped for a dust collector upgrade, I found fan performance curves for the Grizzly cyclone I considered. Perhaps fan performance curves are available for the ones you are considering. A Grizzly 2 hp cyclone versus a Grizzly 2 hp without the cyclone could be compared. Likewise for a 3hp Grizzly, I would look at two sizes to get more data. If lucky you could perhaps get a better idea on the performance hit resulting from adding a cyclone. While this is an imperfect comparison, it can give you some idea. The fan performance curves, if I remember correctly, are buried in the manual, which can be downloaded from their site.

This probably does not help much. Perhaps someone who has some data can provide a better answer.

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OldCoach

23 posts in 335 days


#2 posted 03-12-2016 04:38 AM

My experience when I put an offbrand cyclone that I found on ebay on my shop vac was that it actually increased the suction. Don’t know if this would apply to my HF DC. This brand has a larger cyclone made for a dc and I am tempted to get one just to see. They are less than half the cost of a Dust Deputy.

-- Play cowboy on weekends and make sawdust in between when not watching football

View Alan72's profile

Alan72

187 posts in 1494 days


#3 posted 03-12-2016 05:06 AM

I noticed a big difference when I went from a 4” hose to a 5”. I didn’t notice any loss of suction. I do use a HF DC without any issues.

View MJCD's profile

MJCD

483 posts in 1832 days


#4 posted 03-14-2016 05:33 PM

A 5” will allow approximately 50% more air-flow, than a 4” – the CFM will increase, relative to the 4”, as the static pressure is reduced, as well (a lower % of the airflow is against the sidewalls).

CFM will reduce with any bend in the air stream – just happening to be a Super Dust Deputy in this case. The important question is whether the Dust Collector can draw the additional 50% air, as the velocity of the air stream is important – otherwise, you’re drawing CFM, but not pulling the dust & debris.

-- Lead By Example; Make a Difference

View BobAnderton's profile

BobAnderton

218 posts in 2251 days


#5 posted 03-14-2016 06:22 PM

From Bill Pentz’s spreadsheet for system static pressure calculator you can expect a cyclone to present about 2 inches of static pressure loss. If you look at the fan curve of the system you’re considering you can see how much of a CFM impact this 2” of SP loss will have. If you don’t have the fan curves, you can look at some typical fan curves of dust collectors at this link.

It boils down to losing a couple hundred CFM or thereabouts to the cyclone SP loss.

If you really look at that spreadsheet I linked to you can also quantify how quickly you can offset that SP loss by sizing up your duct runs.

-- Bob Anderton - Austin, TX - Nova 3000 lathe, Alaskan Mark III mill, Husqavarna Saw

View josephf's profile

josephf

125 posts in 1557 days


#6 posted 03-15-2016 12:48 AM

no authority ,and not sure what you got going .but i do know that a small cyclone can only handle so much debris .so if you increase your air flow you increase odds your overwhelm the collector .
i found addition of cyclone made little or know noticable change in my dc performance .but running exhaust directly to outside made a significant increase in suction . no science here . mounting the dc unit to the top of my cyclone seemed to increase suction vs having a hose between dc and cyclone .i have a 1hp dc and a 1 1/2 dc both on ebay type cyclones .both exhaust to the outside .

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