Double Separator for Dust Collection?

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Forum topic by gauntlet21 posted 03-16-2018 06:39 PM 271 views 0 times favorited 3 replies Add to Favorites Watch
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3 posts in 178 days

03-16-2018 06:39 PM

Topic tags/keywords: dust collector separator double idea design question vacuum

I currently have a 2HP Harbor Freight dust collector with a 55 gallon fiber drum dust separator inline. I’ve seen the Thein Baffle but don’t have that feature currently. My question/idea is to add another dust separator ahead of the 55 gallon fiber drum or one behind it. I’m wondering what the results would be. Right now I collect about 80% of the material in the 55 gallon drum and about 20% goes to the actual dust collectors bag. I’m simply looking to minimize the amount that gets to the bag. So if I had the vacuum hose attached to my jointer, then to the 55 gallon drum, then maybe a 30 gallon drum, and then the dust collector, I am wondering what kind of results that would generate. If anyone has attempted this, I’d be interested to hear your results/input.



3 replies so far

View Dustin's profile


489 posts in 708 days

#1 posted 03-16-2018 07:21 PM

You’ll definitely end up with less in the bag, but I think that’s because you’ll collect less in general. Any kind of pre-separator cuts your cfm dramatically, especially poorly designed/cheap separators (like the trash can lid style). This will be made worse by the undersized impeller on the HF DC. If you’re looking for the max amount of separation without sacrificing any more air movement, I’d swap out whatever separator you’re using with an SDD. Depending upon how inefficient the current separator is, you might even see a slight (very slight) uptick in performance.

-- "Ladies, if your husband says he'll get to it, he'll get to it. No need to remind him about it every 6 months."

View Holbs's profile


1843 posts in 1997 days

#2 posted 03-16-2018 11:07 PM

Consider, when you start up your DC, the air has to be sucked out of the 55 gallon drum first and then your 2nd 30 gallon drum, then dust collection starts to happen. That is a lot of air to move on a Harbor Freight dust collector. Heck, that would probably be a no go for my 3HP grizzly.
One nice thing about the Thein Baffle vs drum dust separator: the Thein Baffle only has to work with the volume of air above the baffle, not below the baffle while the drum separator has to work with the entire drum. Granted, still a loss of CFM but that is why it’s a DIY mod :)

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter

View Loren's profile (online now)


10276 posts in 3615 days

#3 posted 03-16-2018 11:20 PM

I think your separator lid just doesn’t work
very well.

I’ve used a Veritas separator lid and it really
gets almost all the planer chips. It’s patented.
Maybe worth a look.

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