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Clogged Dust Collection Piping

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Forum topic by todd4390 posted 10-19-2015 01:03 AM 980 views 0 times favorited 21 replies Add to Favorites Watch
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todd4390

130 posts in 929 days


10-19-2015 01:03 AM

I have a Jet Vortex dust collector in my shop that is hard piped from the collector out to most of my major tools. Tonight while using the jointer I noticed the chips start to blow around the jointer table and realized the dust collector wasn’t sucking. I opened the cover to make sure the fan blades weren’t messed up and they looked fine. I took the flex pipe off the main intake at the fan housing and turned the collector on and it seemed to be sucking fine. After putting the flex back on the suction drops severely. Therefore I assume I have a blockage somewhere. Anyone have a quick and easy way to find the clog? I’m really hoping I don’t have to dismantle most of the piping as it took me a weekend to initially install it. Are there any other possible causes of the suction problem?


21 replies so far

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bondogaposis

4024 posts in 1813 days


#1 posted 10-19-2015 02:03 AM

I would try a plumbers snake before I dismantled anything.

-- Bondo Gaposis

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crank49

3981 posts in 2432 days


#2 posted 10-19-2015 03:01 AM

Once you get it un-clogged you need to add a drop out box adjacent to the jointer and planer if you have one. These two tools make large chips that are easy to separate from the air flow at the source but have a tendency to clump up and block flow through a pipe. Especially on runs with multiple turns and perhaps not designed to account for the velocity needed to keep large chips in suspension.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

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todd4390

130 posts in 929 days


#3 posted 10-19-2015 02:08 PM

What is a drop out box?

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lew

11336 posts in 3217 days


#4 posted 10-19-2015 03:20 PM

Unhook the pipe at the collector and jointer. Take the “air chute” off of your leaf blower. Shove the end of the leave blower into the end of the pipe at the collector. Turn on the leaf blower and stand back. It’ll probably make a mess but…..

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

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Fred Hargis

3932 posts in 1955 days


#5 posted 10-19-2015 03:35 PM



Unhook the pipe at the collector and jointer. Take the “air chute” off of your leaf blower. Shove the end of the leave blower into the end of the pipe at the collector. Turn on the leaf blower and stand back. It ll probably make a mess but…..

- lew

That’s what I would do first, then solve why the clog happened.

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

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todd4390

130 posts in 929 days


#6 posted 10-19-2015 03:36 PM



Unhook the pipe at the collector and jointer. Take the “air chute” off of your leaf blower. Shove the end of the leave blower into the end of the pipe at the collector. Turn on the leaf blower and stand back. It ll probably make a mess but…..

- lew

Hey that’s an excellent idea. Thank you very much.

View Gentile's profile

Gentile

257 posts in 1280 days


#7 posted 10-19-2015 03:46 PM

Try tapping on the pipe to find the blockage and disconnect it there (abouts).
Kind of like finding a stud behind drywall …

-- "I cut it twice and it's still too short"

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brtech

893 posts in 2384 days


#8 posted 10-19-2015 04:59 PM

Are you using 90 degree elbows in your hard pipe? If so, I’d suspect that’s where the blockage is. You need to use 45s and a short straight piece between them.

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todd4390

130 posts in 929 days


#9 posted 10-19-2015 05:06 PM

No 90’s just sweeping 45’s.

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rwe2156

2190 posts in 942 days


#10 posted 10-19-2015 05:06 PM

Past fixing the blockage you need to find out why?
Some reasons:
1. Undersized ducts
2. Restrictions to air flow (bends to sharp, for example)
3. Undersized DC unit

Any of all of the above will cause the air velocity to be too low, which will allow chips to accumulate wherever there is a bend.

If your ducts are too small (<6>s better) be looking for this to happen again.

-- Everything is a prototype thats why its one of a kind!!

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gfadvm

14940 posts in 2151 days


#11 posted 10-20-2015 12:22 AM

I get clogs when planing pitchy or not quite dry enough woods. I feed my 2 1/2” shop vac down the DC tubing and usually can get the clog sucked out. If this fails, I go to the plumber’s snake.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

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todd4390

130 posts in 929 days


#12 posted 10-20-2015 01:29 AM

Got her unclogged tonight with the snake. Thanks so much for all the advice. This is a great site.

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Holbs

1371 posts in 1491 days


#13 posted 10-23-2015 03:59 PM

Is the duct sized to 4”? or 6”? I am in the midst of re-doing my HVAC and new DIY blast gates. I’ll be running 6” to the jointer, but yet unsure of going 4” to my Jet 15% planer due to the existing JET 4” chute exhaust or do some modifications to run 6” duct. For I do not want clumping as you mention, as other’s mention as well :) Of course, I have a Grizzly dual-bag 3HP DC to help with all of that as well. What HP is your Jet vortex?

-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"

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todd4390

130 posts in 929 days


#14 posted 10-23-2015 05:37 PM

I just have 4” pvc piping for all of my ducting until I get to the tool where I just used 4” flex hose. I believe mine is a 1.5 or 1.75 hp unit. I didn’t have any problems with mine clogging over a years worth of pretty hard use. When I found the clog I notice that a piece of electrical tape that I used to make the blast gate fit tighter to the pipe had come loose and was crossing the diameter of the pvc pipe so that is what actually caused the clog.

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crank49

3981 posts in 2432 days


#15 posted 10-24-2015 01:43 AM


What is a drop out box?

- todd4390


Sorry I took so long to get back.
Been working way out of town.

Air flows through a pipe at a pretty fast pace.
The speed of the flow keeps solids, like wood chips and dust, in suspension and moving with the flow.
If you expand the size of the duct the speed of the flow is reduced.
Some people call the expanded part an expansion chamber. Others call it a drop out box.
It does not have to be a duct at all, just a container with a large cross section area.
A duct goes in and the air, and chips, hit a baffle plate.
The duct going out is on the opposite side of the baffle.
Since the air is moving through the chamber or box very slowly, when the chips hit the baffle they drop to the bottom. The slow moving air can’t keep them in suspension.
Then on the other side of the baffle, the air starts to gradually accelerate back into the exit duct.
Most of the heavy dust, chips and junk stays in the box.

A “drop out box” does not have to be a box at all. A trash can works very well. Larger the better.
The lid can have two duct connections, side by side, pointed at the bottom of the can.
Very simple and very effective at removing planer and joiner chips right next to the machine and keeping them out of the rest of the ductwork.

This is a very simple technique that has been used extensively by dust collecting professionals for half a century that I know of. Probably much longer, but I started in the business in 1972 and can’t speak with authority of personal experience beyond that.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

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