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Rectanglar Dust Separator

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Forum topic by Big Ben posted 01-05-2011 06:52 PM 7108 views 1 time favorited 19 replies Add to Favorites Watch
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Big Ben

87 posts in 2355 days


01-05-2011 06:52 PM

Topic tags/keywords: duct collection dust dust separator air flow

I love my Harbor Freight Dust Collector, but I hate changing the lower bag on the unit. This is mostly due to my laziness and the cost of the bags. The easy solution to this would be to add a dust separator. My issue with that solution is space. I have a small shop and have 19” of space between my bench (that is another project I have yet to complete) and my DC to where it would go. My solution to this is to make a box from MDF, that would be 18”W, 24” L and 38”. The front of the box would be plexi-glass or another transparent material to allow me to see when it is getting full.

My question is, does having a rectangular structure change the air flow to enough to not make it worth it? I am not sure if I would get the air flow I would need. Below is picture of what it would potentially look like. My current thought would be to have the in feed and out feed mounted in the lid and have clear drum lines for easy cheap clean up

From Woodworking

Here is the product I would for the infeed and outfeed lines:
http://www.rockler.com/product.cfm?page=25225&source=googleps&utm_source=GoogleBase&utm_medium=organic&utm_campaign=Google


19 replies so far

View dq2's profile

dq2

71 posts in 2269 days


#1 posted 01-05-2011 07:24 PM

Sounds like you have a good plan in mind. The idea is to have gravity work for you so the big stuff drops out before it gets to the DC. I find no air flow problems unless I have a long run.

I made a separator out of an old garbage can, but after seeing your link to the Rockler plan, I think I will build a box for under my planer. Sure looks a lot easier for cleanup than emptying a big garbage can.

Thanks for sharing.

-- - DQ in Phoenix -

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NBeener

4808 posts in 2639 days


#2 posted 01-05-2011 07:48 PM

My understanding is … that a “drop box”—what you’re talking about—is old school, and pretty common.

If you’re a FWW online subscriber, take a look at this article:

http://www.finewoodworking.com/fwnpdf/011117066.pdf

And an article with more discussion on the topic:

http://www.woodweb.com/knowledge_base/Setting_Up_Dust_Collection.html

-- -- Neil

View Joe Lyddon's profile

Joe Lyddon

9444 posts in 3517 days


#3 posted 01-05-2011 09:13 PM

I have a Dust Deputy to a Ridgid shop vac…
... It really works GREAT!

The principle is the same… I think the circular cone would work better… All of my hose connections and internal holes are never smaller than the main hose.

Any vacuum source can be used… all you’d have to do is connect it in series in place of your rectangular unit.

-- Have Fun! Joe Lyddon - Alta Loma, CA USA - Home: http://www.WoodworkStuff.net ... My Small Gallery: http://www.ncwoodworker.net/pp/showgallery.php?ppuser=1389&cat=500"

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Big Ben

87 posts in 2355 days


#4 posted 01-05-2011 10:23 PM

I have a Dust Deputy and it works great with the shop vac but the 2.5” hose would slow down and restrict the air flow. Also my jointer and planer would fill that very fast.

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Joe Lyddon

9444 posts in 3517 days


#5 posted 01-05-2011 10:32 PM

How big is the hole in the horizontal separator piece?

-- Have Fun! Joe Lyddon - Alta Loma, CA USA - Home: http://www.WoodworkStuff.net ... My Small Gallery: http://www.ncwoodworker.net/pp/showgallery.php?ppuser=1389&cat=500"

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Big Ben

87 posts in 2355 days


#6 posted 01-05-2011 10:36 PM

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DaddyZ

2475 posts in 2505 days


#7 posted 01-05-2011 10:45 PM

Ideas !!! Sweet Ideas !!!

-- Pat - Worker of Wood, Collector of Tools, Father of one

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Joe Lyddon

9444 posts in 3517 days


#8 posted 01-05-2011 10:55 PM

Oh, it didn’t look that big to me…

If your planer & jointer would fill a 5 gal can FAST, your proposed system doesn’t look that much larger… wouldn’t it fill up pretty fast?

What do you use the Dust Deputy for?

Why not use a fiber drum as shown in the Rockler Ad of the link you posted? That looks like it would really do the job better than what you’re thinking about.

-- Have Fun! Joe Lyddon - Alta Loma, CA USA - Home: http://www.WoodworkStuff.net ... My Small Gallery: http://www.ncwoodworker.net/pp/showgallery.php?ppuser=1389&cat=500"

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Big Ben

87 posts in 2355 days


#9 posted 01-05-2011 11:42 PM

My design is to do the best with the space limitations I have. The box would be 18”Wide , 24” Long and 38” high. The box design is not as large as a drum but that size will be should be sufficient. I have not found a drum that could fit in that space well.

I dont really use the Duty Deputy any more, I use the shop vac for cleaning the shop, since I have a DC now.

View b2rtch's profile

b2rtch

4822 posts in 2513 days


#10 posted 01-06-2011 12:14 AM

Don’t you need to have the spiral flow of the air stream and the centrifugal force to separate the heavier particles?
I do not think that square box would work well.
My 2 cents.

-- Bert

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Big Ben

87 posts in 2355 days


#11 posted 01-06-2011 12:51 AM

Bert,

I am not sure and have been looking for answers, do you have any suggestions?

View Joe Lyddon's profile

Joe Lyddon

9444 posts in 3517 days


#12 posted 01-06-2011 04:24 AM

After studying it a little more, I think Bert has a good point.

I take it the TOP is the input and the bottom the Output…

I see the top section getting filled to the point where it does not hold anything back anymore and everything just goes directly to the bottom hole… I don’t think it would get half full before it happened.

I think I would take the Dust Deputy idea of the cone, etc. and building something like it instead.

It wouldn’t cost you much to try it… to find out…

-- Have Fun! Joe Lyddon - Alta Loma, CA USA - Home: http://www.WoodworkStuff.net ... My Small Gallery: http://www.ncwoodworker.net/pp/showgallery.php?ppuser=1389&cat=500"

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Big Ben

87 posts in 2355 days


#13 posted 01-06-2011 04:37 AM

Joe,

The air infeed and outfeed would both be in the top of the box. From some further research I have done, I would need to have a baffle between them to aid the heavier material in staying in the bottom. The idea is not much different from the drum, except its a rectangle.

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b2rtch

4822 posts in 2513 days


#14 posted 01-06-2011 01:27 PM

” The idea is not much different from the drum, except its a rectangle.”
I disagree with you.
I have been working around cyclonic cleaners for quite a few years, the first were on Farr air filters on heavy construction equipment over 30 years ago, and I always saw the whirlpool or circular flow of the air or gas or even liquids as creating or helping the separation, by centrifugal force, of the dirt or dust or heavier material.
At the same time there is a reduction of the flow velocity( as the flow goes from the wall/outside of the barrel or air cleaner to the center, the distant to travel decreases , decreasing the air velocity) which force the heavier material to fall to the bottom of the cyclone or can.
In your design you achieve neither one of the two effect.
Your air velocity remains constant as well as the air pressure, so the dust and chipping will remain suspended in the air flow and you will not achieve a good separation if any at all.
I fail to see how this design could effectively work.
You certainly can try your idea and you might have some results but I doubt that they will be as good as with a barrel or a round shape.

-- Bert

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Big Ben

87 posts in 2355 days


#15 posted 01-06-2011 08:38 PM

Bert,
I do not pretend to be an air flow/dust collection expert. I just want the wood chips in the box. I do not believe this design will be as efficient as a cylinder shaped unit, but I do think a rectangular box will get the job done. Please see the article NBeemer posted above. I appreciate your insight, I want to make the best separator I can.

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