Dust collection question

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Forum topic by iminmyshop posted 02-16-2015 08:03 PM 895 views 0 times favorited 3 replies Add to Favorites Watch
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287 posts in 2235 days

02-16-2015 08:03 PM

Topic tags/keywords: dust collection port size precollection

My shop uses a 1.5 hp Powermatic dust collector to which a precollection separator using a Woodcraft cyclone lid on a 30 gal. trash can has been added. This generally does a good job getting the larger particles out before going to the dust collector.

My question is this: The port leaving the Powermatic is 6” but the ports going into the cyclone lid are 4”. This cuts the suction power way back before the system has even had a chance to pick up its first speck of dust. Has anyone made their own separator or know where you can get one using larger ports?


3 replies so far

View TheFridge's profile


10818 posts in 1727 days

#1 posted 02-16-2015 08:10 PM

Sounds like a sawzall and duct tape will fix that problem

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

View WhyMe's profile


1080 posts in 1802 days

#2 posted 02-16-2015 08:27 PM

The super dust deputy has a 6” outlet and 5” inlet. But you end up using a 4” or 2.5” fitting on the power tool. So you restrict the air flow one way or another.

View crank49's profile


4032 posts in 3212 days

#3 posted 02-16-2015 09:25 PM

You don’t need the cyclonic action of the “cyclone lid”.
Sure, it does increase the separation of fine dust from the air stream, but it also increases the loss of static pressure.
A can with simple in and out pipes will do the job just fine. Even a square box will work.
The bigger the can the better it will work. Two 30 gallon cans, one on top of the other, would be super. Extend the inlet pipe about 2 diameters into the can. 6” pipe = 12” extension. Put the outlet as close to the inlet as possible, but without the extension.

For what it is worth the resistance of 4” pipe is a little more than twice the resistance of 6” pipe.

The Super Dust Deputy has been mentioned. It will do a superior job of separating even more fine dust from the flow than most other solutions. BUT, it does this at a cost of even more static pressure. That is how cyclones work. The higher the static pressure loss in the cyclone, the higher the effeciency of capturing fine dust. A very high effeciency cyclone might be the equivalent of sucking all the air through a 2” pipe.

Your concern was about loss of suction due to the size of the inlet pipe on the cyclone lid versus the outlet of the dust collector. Any form of cyclone will make this problem worse, not better.

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