New diy dust system

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Project by FreddieMac posted 02-26-2020 01:03 AM 784 views 1 time favorited 7 comments Add to Favorites Watch

Decided to upgrade from my shop vac system to a DIY dust collection system. The estimated cost for my system was about $125. My wife caught the portable central mechanics dust system on sale for about $90 bucks. I found one of those cyclones for $24 buck online. I added a $10 dryer kit and $8 garbage can from Walmart. I decided to stick with all the existing 2.5 hoses I have for my shop vacs. I cut some strips of wood to mount everything to the wall getting it up off the floor. The 3/4 ply is mounted with 2.5” lag bolls into the studs. Mounted the dust engine with 1.5 lag bolts. I cut out some 1/4 melamine board to make the can top more sturdy. Took about 3 hours to assemble everything and test it, it was worth it.

7 comments so far

View swirt's profile


4952 posts in 3656 days

#1 posted 02-26-2020 02:35 AM

Wow, that is an interesting take on a dust collection system. Makes perfect sense.

-- Galootish log blog,

View woodchuckerNJ's profile


1374 posts in 2318 days

#2 posted 02-26-2020 03:29 AM

makes no sense. you are cutting off the supply. For a 2.5 inch system a vac is better.
A dust collector is good for 4” and up depending on the static pressure.

Think of it like trying to suck a milk shake through a tiny cocktail straw.

BAD. And you might burn the motor out, because it will spin so much faster since it doesn’t have any load. You see cutting off the air supply cuts the volume and load.


-- Jeff NJ

View FreddieMac's profile


151 posts in 1031 days

#3 posted 02-26-2020 03:59 AM

Actually, no it is not like trying to suck a milk shake through a cocktail straw. I do not need to move big material very far. The portable dust collector does not have as much horse power as the stand up model. Given the reduce air flow with the lower horse power, to increase air flow I stepped down from 4” ducting. Yes, I will not be able to move as much material through a 2.5 inch pipe, but the physics is on my side here, and the air flow with this system is excellent. The air flow through this system is the same as the stand up model with 4” ducting. So I got a cheaper motor and used the diameter of the pipe to increase the “power.” The shop is only 16×10, so given that I am not running a bunch of pipe, but using one 13’ hose with quick attach port on the end, the results are actually very good. The system had enough flow to pick up wood out of my planner and move it from there to the trash can.

View Redoak49's profile


4529 posts in 2672 days

#4 posted 02-26-2020 11:47 AM

Note: you did not increase air flow by stepping the size down. You decreased air flow. You are not getting the same air flow, cfm, as with a 4” .However, if it works for you, that is fine.

View FreddieMac's profile


151 posts in 1031 days

#5 posted 02-26-2020 02:21 PM

You decrease the volume that can move through the pipe (air, dust, particulate) but you increase the velocity of the air moving through the pipe.

View EllenWoodHead's profile


73 posts in 60 days

#6 posted 02-26-2020 06:57 PM

You have the right idea, my system is similar. Dust collection systems become expensive and complex when you’re recycling your air by installing the vacuum inside. I have a $200 Grizzly 1 HP wall-mount vac with a 30 micron bag. The only reason I even bother with the bag is fire hazard and mess, because I mounted the vac outside. I built a little enclosure around it to muffle the noise. Inside my shop is a separator. On nice days I open a window. I also use a hanging air filter because the vac doesn’t capture everything. Works like a charm without breaking the bank.

-- "wood" and "good" rhyme, but not "food"

View Byany's profile


5 posts in 1115 days

#7 posted 02-27-2020 01:47 AM

your cyclone might be too small. It looks like your going to burn that collector out prematurely. There is a larger one made for dust collectors. The one you have now is made for a shop vac.

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