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back to back dual blowers for dust collection & venting outside

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Forum topic by maburton posted 06-28-2017 02:32 AM 1509 views 0 times favorited 8 replies Add to Favorites Watch
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maburton

10 posts in 393 days


06-28-2017 02:32 AM

Topic tags/keywords: dust double blower super dust deputy dust collection vent outside question cyclone

I have a Powermatic 2000 table saw and a delta 2HP dust collector. I just added the super dust deputy cyclone unit and notice a drastic reduction in CFPM. has anyone added another dust collector blower back-to-back to increase the CFM? I also added a split and homemade 4” dust collector to the saw blade cover which probable added to the reduction in suction. but no matter the cause, I need more suction.
I am planning on eliminating the bag and move from dust collection, which I don’t care to collect to dust removal and vent to the outside. but I wanted to set the system up first with the bag and only one blower and add the next two steps one at a time. dual blowers, then vent outside. my delta has 6” ports and the harbor freight, 1.5 HP has 4”ports.
any tips?
has anyone tried this double set up verses buying a bigger model?

-- mark burton greensboro NC


8 replies so far

View Redoak49's profile

Redoak49

2890 posts in 1822 days


#1 posted 06-28-2017 11:03 AM

The question has been asked a number of times and the answer has been no. Two units will fight each other and may burn up. There just is no practical way to set them up in series or parallel.

View TungOil's profile

TungOil

741 posts in 329 days


#2 posted 06-28-2017 11:22 AM

Also reconsider your plan to vent outside. you will need to provide makeup air equivalent to the CFM of you system. FWIW I have a PM2000 and I think the dust collection on it is not very good from the factory. It is my only complaint with the machine.

-- The optimist says "the glass is half full". The pessimist says "the glass is half empty". The engineer says "the glass is twice as big as it needs to be"

View rwe2156's profile

rwe2156

2710 posts in 1315 days


#3 posted 06-28-2017 02:26 PM

No reason it shouldn’t work fine if you’re just collecting right off the TS.

Venting outside will definitely compensate for cyclone loss.

IMO make up air is over emphasized however it will be a factor if you’re leaving blower running during a big milling job or if maybe if the shop is climate controlled and air tight. If being heated in winter it def could be an issue if the shop is relatively small.

I don’t know about your blower peformance but FWIW I’m running a ducted system with a cyclone (vented outside) off a 1 1/2 HP Jet blower and it works fine. 20’ run to TS thru 6” ducts. I had myself convinced I would need to upgrade but surprisingly the blower is adequate.

-- Everything is a prototype thats why its one of a kind!!

View maburton's profile

maburton

10 posts in 393 days


#4 posted 06-28-2017 03:15 PM

Has anyone on this site installed blowers back to back?
I dont care anything about heat loss, I live in North Carolina and I work with the garage doors open 9 months out of the year with big fans blowing air through my garage. for the three months I have the doors closed I have two radiant heaters that roast the shop. plus I dont think the system will run long enough during a day to suck all the heat out of the shop.
my dust collection system is in a separate room from the work shop which is a 3 car garage with about a 10 foot run max between them. when I add a mitre saw and band saw to the system they will not be any further away.
for my jointer and lathe I just roll them outside and let the wind take care of the dust.

I got advice from a reputable source to try it but measure the ampere draw on both motors running to make sure I dont burn them up. I tired to search for the other posts with this subject but could not find any?

Has anyone on this site installed blowers back to back?

-- mark burton greensboro NC

View TungOil's profile

TungOil

741 posts in 329 days


#5 posted 06-28-2017 03:35 PM

I don’t think you will find that anyone has done back to back systems because putting blowers in series is not a good idea. You could install them in parallel to pick up some CFM, but only if they are identical units. When I was a plant engineer years ago I designed many industrial art handling systems, so I’m not blowing smoke up your a$$.

Since you are in a warm climate and work with the garage door open frequently, you have effectively solved the make-up air issue (which is very real). Given this additional information, I think you can remove the filter from your unit and duct it outside without any issues until you close the shop up in winter.

The DD is your real issue here. You added a significant source of resistance to your system, and you should expect to see a corresponding drop in performance from it.

-- The optimist says "the glass is half full". The pessimist says "the glass is half empty". The engineer says "the glass is twice as big as it needs to be"

View Carl10's profile

Carl10

68 posts in 290 days


#6 posted 06-28-2017 04:38 PM

Stumpy did a video of what your are talking about, but as stated they were identical units on separate circuits with current monitored for both. In his mirror motor setup it seemed to work under careful eye. I agree with others, it is generally a bad idea.

Carl

View ArtMann's profile

ArtMann

678 posts in 650 days


#7 posted 06-28-2017 05:52 PM

If you try this, make sure you have ammeters in place for each blower and monitor them carefully. You will have an excellent opportunity to burn up one or two blower motors if you aren’t careful.

View Redoak49's profile

Redoak49

2890 posts in 1822 days


#8 posted 06-28-2017 08:02 PM

I assume that you are suggesting mounting the dust collectors in series. With a 2 HP dust collector, you will likely be getting something like 700 cfm based on actual test data in Wood Magazine.

If you put one in front of the other, then you will be pushing 70o cfm into the second dust collector and it will be running very fast and likely beyond the motor limit. Running in parallel, you would need to extremely carefully watch and balance the loads.

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