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Would this be an ok setup for a DC system - adding a seperator

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Forum topic by thomasfurman posted 02-12-2017 05:01 PM 465 views 0 times favorited 9 replies Add to Favorites Watch
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thomasfurman

22 posts in 334 days


02-12-2017 05:01 PM

Just got a big boy dust collector. I’d like to add a separator “cyclone” so I don’t have to empty the bag or unclog the impeller. I picked up a nice locking 30g drum.

I’ve seen many people modify the DC so the motor is mounted higher (on 2×4) and the drum sits beneath. I’m not to keen on modifying my new stuff to that degree. Would it be ok, or would it ruin the CFMs if I build a little stand and place the drum above the motor?

I attached a little drawing to show what I so poorly described.


9 replies so far

View Fred Hargis's profile

Fred Hargis

4757 posts in 2330 days


#1 posted 02-12-2017 06:53 PM

What you want to do will work just fine. The downside might be there are more elbows for the air to negotiate which increases drag on the flow, and if that’s all flex hose it will increase significantly.

-- Our village hasn't lost it's idiot, he was elected to congress.

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TheFridge

8303 posts in 1323 days


#2 posted 02-12-2017 07:06 PM

Ditto

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

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thomasfurman

22 posts in 334 days


#3 posted 02-12-2017 07:48 PM



What you want to do will work just fine. The downside might be there are more elbows for the air to negotiate which increases drag on the flow, and if that s all flex hose it will increase significantly.

- Fred Hargis

that’s what I was assuming…poop…maybe ill try it and see!

View Shawn Masterson's profile

Shawn Masterson

1322 posts in 1785 days


#4 posted 02-12-2017 08:11 PM

Here is a link to my system. It’s very similar to what you are trying to do, and works great. It does fill up pretty fast when planeing. for your setup I would hang the motor over the 30 gallon bin. that would shorten up the pipe and loose some elbows. http://lumberjocks.com/topics/49759

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jimintx

511 posts in 1421 days


#5 posted 02-16-2017 05:29 PM

I suggest you build it exactly as you want, and see how it works. Our internet guesswork will not beat the accuracy and usefulness from an actual test of the system.

When you do, think of every step you can to minimize the drag on air flow. Maybe use 6” hard lines to connect from your drum to your blower motor suction. Come out of the side of the 30g drum, up high near the top, rather than straight up out of the top, so an elbow is eliminated. Use 45-degree bends when possible, instead of 90-deg. And so on.

I believe this question is about reducing internal drag, not about any pressure differentials that might result simply from the drum being higher above the motor. I bet that almost every DC system in use could be redone to cut some of the internal drag. If you make sure your whole system is well designed, the effect off this plan for drum placement should be negligent, and maybe none.
...

-- Jim, Houston, TX

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sawdustdad

334 posts in 722 days


#6 posted 02-16-2017 06:51 PM

My only comment is handling the drum full of chips that is a few feet off the floor. I’d just set the drum on the floor next to the blower. That way you can hand truck it out without risk of dropping it on your foot!

-- Murphy's Carpentry Corollary #3: Half of all boards cut to a specific length will be too short.

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pintodeluxe

5466 posts in 2650 days


#7 posted 02-16-2017 06:56 PM

1-1/2 hp minimum motor requirement to add a separator. 2hp would be better.

Fan diameter and duct layout has a great deal to do with the final performance of the system. The 14-15” fans do a pretty good job at generating CFM. 4” trunk lines and flex hose do a pretty good job of killing CFM.

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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sawdustdad

334 posts in 722 days


#8 posted 02-16-2017 07:31 PM

One more comment. I put my 30 gal separator right next to my planer. That way, you’re not pulling all those chips all the way to the blower. My planer is about 30 feet from my DC.

-- Murphy's Carpentry Corollary #3: Half of all boards cut to a specific length will be too short.

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jimintx

511 posts in 1421 days


#9 posted 02-16-2017 08:08 PM



One more comment. I put my 30 gal separator right next to my planer. That way, you re not pulling all those chips all the way to the blower. ...

- sawdustdad

Very good point.

-- Jim, Houston, TX

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