Thien Dust Collector mod - Why??

  • Advertise with us

« back to Focus on the Workspace forum

Forum topic by becikeja posted 01-16-2014 12:44 PM 1484 views 0 times favorited 9 replies Add to Favorites Watch
View becikeja's profile


891 posts in 2839 days

01-16-2014 12:44 PM

All over LJ and other sites as well I have seen dust collectors modified with the Thien separator. I am very curious and have an itch to go add one of these to my system but I don’t know why.

I get the fact that the larger particles fall into this new added trash can and it reduces the amount of waste that ends up in the bag. That appears to be a significant advantage because its easier to dump.

But it seems to me that adding this additional component would reduce the amount of suction available at the end of the hose. The trade off’s between suction loss and ease of waste disposal don’t seem to offset for me.

What am I missing? Are there advantages that I am not taking into consideration.

-- Don't outsmart your common sense

9 replies so far

View gtbuzz's profile


427 posts in 2468 days

#1 posted 01-16-2014 01:21 PM

You’re right, it does slightly reduce the suction due to the increase in static pressure. The main purpose of these things, however, is not to keep the bag from filling up as quickly but rather to keep far less material out of the filter. In doing so, it remains free and clear for longer. You end up taking the initial hit on suction but over time, it remains relatively consistent, whereas if you didn’t separate out the bulk of the heavy particulates first, they would really degrade performance over time.

View bondogaposis's profile


4766 posts in 2377 days

#2 posted 01-16-2014 01:33 PM

Yes, gtbuzz has it right. Another advantage is that it keeps the majority of the debris from ever contacting the impellers. That reduces wear and tear and on the dust collector especially when you consider how likely it is to suck up screws and other harsh bits that can be found on most shop floors.

-- Bondo Gaposis

View Fred Hargis's profile

Fred Hargis

4999 posts in 2519 days

#3 posted 01-16-2014 01:36 PM

Plus, it’s easier to empty the can with a Thein than a dust bag on a SS DC.

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

View DIYaholic's profile


19623 posts in 2701 days

#4 posted 01-16-2014 02:46 PM

A canister filter improves air flow (due to the increased surface area) and removes more of the dangerous fine particles (better for your lungs). I highly recommend a Wynn Nano filter. If you add a Thien pre-separator and also upgrade to a canister filter, the loss of suction (from the Thien upgrade) is offset by the increase of suction provided by the canister. You also will be able to reduce the risk to your lungs!!!

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procrastination a bad thing?

View becikeja's profile


891 posts in 2839 days

#5 posted 01-17-2014 11:33 AM

good points to consider.


-- Don't outsmart your common sense

View bbc557ci's profile


595 posts in 2100 days

#6 posted 01-17-2014 02:26 PM

Loss of suction …. My HF DC is integrated with a cyclone and it flattened a Brute 30-32 gallon can, so I had to switch to a metal can. No expert here at all, but think I can live with the minor loss of suction ;o)

-- Bill, central where near the "big apple"

View BTimmons's profile


2303 posts in 2511 days

#7 posted 01-17-2014 03:58 PM

Bill, I did the exact same thing when I made my first separator for the HF DC. Plastic trash can crumpled like a paper bag!

-- Brian Timmons -

View Loren's profile


10476 posts in 3674 days

#8 posted 01-17-2014 04:10 PM

I have a cyclone and the filter gets clogged often. A larger
filter would be one solution. Mine is a diesel truck filter.

I’d prefer outside bags. I have a second dust collector
with bags and it doesn’t lose suction the way the cyclone
does. To be fair the cyclone is underpowered and
the bag collector is a beast.

View Mark's profile


919 posts in 2001 days

#9 posted 01-17-2014 04:26 PM

becikeja. I’m running a Thien clone on a 5gal plastic paint can with a 14 gal. Rigid Shop vac. Works like a hot damn.

-- Mark

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics