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2 HF dust collectors connected together

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Forum topic by sawdustjunkie posted 08-11-2014 01:53 AM 733 views 0 times favorited 24 replies Add to Favorites Watch
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sawdustjunkie

212 posts in 440 days


08-11-2014 01:53 AM

Just wondering if I could connect two HF blowers to increase suction!
I am using one with a Super Dust Deputy (the plastic one) and a trash can with a sealed lid and I also have a Wynn air filter on the top instead of the cloth bag.
Would it be too much suction for the system or not?
I would use 4” Y connectors to hook up the blowers and then connect one to the Dust Deputy.

What do you all think?

-- Steve: Franklin, WI


24 replies so far

View Loren's profile (online now)

Loren

7809 posts in 2370 days


#1 posted 08-11-2014 02:03 AM

Dunno really, but I do have 2 dust collectors.

One is a cyclone built from the Wood magazine plane. I
bought it from the builder. It’s okay but it fills up
fast with planer chips and the filter has a tendency
to clog. I use it for table saw, band saw and panel
saw.

For the planer and the sanders I have a 3hp dual
bag unit outside. Since the bags are outdoors
escaping dust doesn’t concern me much.

-- http://lawoodworking.com

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TheFridge

963 posts in 209 days


#2 posted 08-11-2014 02:08 AM

Research how much suction you can get out of a 4” hose. Don’t know if you can’t hook 2 up together but I don’t know if a single 4” hose or pipe could handle 2 collectors.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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Loren

7809 posts in 2370 days


#3 posted 08-11-2014 02:16 AM

I don’t think you’ll get much more suction by putting
one blower directly behind the other.

If I were you I’d consider a setup where planer, jointer
and router table shavings go in a bag and the saws
and sanders go to the thing with the filter.

-- http://lawoodworking.com

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TheWoodenOyster

975 posts in 658 days


#4 posted 08-11-2014 02:17 AM

Stumpy nubs did that. He basically just supercharged one fan with the other fan. It worked, but I’m not sure hoe “safe” it is. Check out his video on youtube about it.

-- The Wood Is Your Oyster

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Pezking7p

1473 posts in 374 days


#5 posted 08-11-2014 02:23 AM

Stumpy nubs did this wih some success I think. But there was a risk of causing a fire, so if you try it , keep fire extinguishers on hand.

-- -Dan

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sawdustjunkie

212 posts in 440 days


#6 posted 08-11-2014 02:23 AM

When I first set it up, it had a lot of suction, but when I installed the Super dust Deputy, I really think I lost a lot of suction. That is why I was just thinking about hooking up two together.
The one thing I do is I only have one machine running at any time, so I don’t have any duct work. I just have 1 4” flex hose hooked up to one machine at a time.

-- Steve: Franklin, WI

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Loren

7809 posts in 2370 days


#7 posted 08-11-2014 02:25 AM

Check your air filter for clogging. Corrugated
filters can clog fast and the suction sags a lot.

-- http://lawoodworking.com

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sawdustjunkie

212 posts in 440 days


#8 posted 08-11-2014 02:42 AM

I have the Wynn air filter and there is no dust in it. In fact there is very little dust in the plastic bag. It is all being collected in the trash can that the dust deputy is mounted to.
The super dust deputy works great, it just cuts the suction way down. That is why I thought about hooking up another blower to increase suction.

-- Steve: Franklin, WI

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exelectrician

1714 posts in 1150 days


#9 posted 08-11-2014 02:46 AM

Try it out connect in series, connect in parallel, see for yourself which work the best ! What could go wrong/ it is just air you are pumping around.

-- Love thy neighbour as thyself

View bobkberg's profile

bobkberg

372 posts in 1796 days


#10 posted 08-11-2014 03:14 AM

I might disagree, but not sure. I did try connecting two shop vacs together in parallel, and ended up burning out both of them. The problem was that the 2 inch vacuum tubing was barely enough for one shop vac and putting two of them together put more static load on the motors than they were designed to handle.

-- Bob www.singularengineering.com - A sideline, not how I earn a living

View crank49's profile

crank49

3481 posts in 1693 days


#11 posted 08-11-2014 03:21 AM

As good as the Dust Deputy is, it does not help the HF 2HP collector in my opinion.
Think about what you just said. “The one thing I do is I only have one machine running at any time, so I don’t have any duct work. I just have one 4” flex hose hooked up to one machine at a time.”

Okay, so you have two things killing your suction. A 10 foot long 4” hose has about the same resistance as 100ft of smooth 5” pipe. Then you are putting a cyclone in the flow. That probably drops your static pressure by at least 4” to 6”. You only had about 8” to 10” of static to start with so you are cutting it in half.

The inlet of the HF collector, If you remove the “Wye” is 5” diameter. The best system for a single hose setup would be 5” hose.

The Wynn cartridge should have helped the flow a little and it does a better job of capturing fine dust so it would be a keeper.

If you want to double something you would be better off double the cyclones, connected in parallel, side by side. Connect the cyclone top outlets to two 4” hoses terminated at the wye inlet on the fan. Then add a 4” x 4” x 5” wye and two short 4” hoses to the cyclone inlets. Then run a 5” hose from this wye to which ever machine you want to run.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

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sawdustjunkie

212 posts in 440 days


#12 posted 08-11-2014 03:39 AM

What I was thinking about was to hookup two blowers together with a y connector then hook the 4”hose from the y to the dust deputy inlet. Then use the flex hose from the dust deputy to whatever machine I am using. According to the Oneda site, the super dust deputy can handle up to a 3 H.P. motor. Considering the HF motors are really only 1.5 horse each it should be able to handle it. The only thing I can think of is with the 2 10” blower fans, it may be too much and may not work like I would like it to.

-- Steve: Franklin, WI

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TheFridge

963 posts in 209 days


#13 posted 08-11-2014 04:06 AM

That 4” duct will strangle the suction if 2 are connected.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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crank49

3481 posts in 1693 days


#14 posted 08-11-2014 04:50 AM

I’m an engineer with 40 years experience designing pollution control systems.
I suggested what would be the best way to use what you have and what would be best to expand it’s capacity.

Another fan will not gain you much except for a larger electric bill and higher noise level.

No skin off my back side which ever way you go about it.

Good luck.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

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REO

648 posts in 797 days


#15 posted 08-11-2014 01:06 PM

Cyclones are designed for a speed of airflow not an amount of suction. This would equate more to volume not pressure. It is surprising that a comment was made about burning out a dust collector because it was being starved for air. a shop vac setup sees the outgoing air over the motor for cooling the motor. this is why they burn out when they are starved for air. most dust collectors use TEFC motors and use ambient air circulation for cooling. the actual load on the motor is decreased when the flow is restricted that’s why when you plug the end of a vacuum cleaner hose the pitch goes up. the rpms are increasing because he load is decreasing. this is different with positive displacement blowers but you do not have one of these on your dust collector. Putting two DC’s in series will slightly raise the static pressure of the system but the volume of air will not increase by much because it is regulated by the duct. The inexpensive DC’s count on the restriction of the inlet ring on the fan to regulate volume. you can increase the diameter of you duct but do not change the inlet collector of the fan. two cyclones on the same fan and you will loose efficiency somewhere. the cyclone will short circuit the fine dust if the speed and volume is not correct. You have to determine what you want more static ,more volume, better removal of fines from the sawdust etc.

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