Dust Collection set up Questions

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Forum topic by , posted 03-23-2014 03:43 PM 1277 views 0 times favorited 7 replies Add to Favorites Watch
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2387 posts in 3541 days

03-23-2014 03:43 PM

My next exciting venture is going to be getting all of our machines piped for dust collection. At our old shop, we only had dust collection ran to the sander and our planers/molder. This time, we are running dust collection to our 3 planers, 3 shapers, 2 table saws, sander and Blum minipress machine.

My question mainly pertains to the table saws. We are running 8” trunk and reduce to 6” drops. We will run 6” straight to each machine. Everything should hook up fine. But I have never ran collection to the table saws. They are both 3 hp enclosed cabinet saws, one grizzly and other unisaw. My concern is actually how effective dust collection will be at the table saw since a lot of dust naturally escapes the blade. Since I will use zero clearance inserts this should be less of an issue.

In my mind, I would think if I were to route the pipe to a shroud that is located just below the blade I would get better collection. Of course I would have to ensure the shroud sat low enough to allow for the blade to be adjusted to a 45 degree angle.

Has anyone had any great success with pulling dust from the table saw blade. I have also given some thought to over blade guard / collection set up. Not sure how effective that would be, or not.

My goal is to get our shop close to dust free.

Down the road I will add dust collection to our miter saws and our 12” RAS that runs a dado blade. The RAS is rarely ever used. Only when running a series of repeatable dados on boards 15” wide or smaller, which is fairly rare. Miter saws are used a lot and thus could benefit from dust collection.

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7 replies so far

View Fred Hargis's profile

Fred Hargis

4980 posts in 2487 days

#1 posted 03-23-2014 04:07 PM

6” ductwork with big air flow does very well in the cabinet. But getting what the blade carries onto the table will require an over blade pickup of some kind. With good air flow an over blade will be much better than anything you can do under the table to catch the dust in the blade gullets, they just move too fast. My over blade has a 4” connection and really works well, that 4” is on the same run as the 6” that goes down to the cabinet. A lot of guys say they don’t use ZCI’s thinking the DC does better without them. I don’t see it that way, to me the insert is usually covered by the workpiece anyway while you’re cutting so in terms of DC I don’t seeing the ZCI being a winner or loser….but here’s plenty of other reasons to keep use them. As always, just my opinion. BTW, I wish you the best of luck with the miter saws; the RAS, OTOH, works fairly well with DC.

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

View crank49's profile


4030 posts in 2965 days

#2 posted 03-23-2014 04:14 PM

With a zero clearance insert the dust collection below the table will not do much; well it will help keep the inside of the machine clean I suppose.
But, ZC inserts and sleds both cause much more dust to be thrown off above the table. At least in my experience it does. Depends on the cuts though. It’s most noticeable when making a clean-up final cut, where the slot would be more open without a ZC insert.
If you have a 6 inch pipe going to the machine already, just split it into two 4” lines and connect one to the cabinet and the other to an above table blade guard or shroud.
Two fours have almost the same capacity as a single six inch pipe.
Same for two six inch pipes will have almost the same capacity as a single eight inch pipe. So you should be able to run two six inch lines at the same time and see almost full flow in the eight inch line.

View Shawn Masterson's profile

Shawn Masterson

1325 posts in 1942 days

#3 posted 03-23-2014 06:25 PM

As stated in the first comment: an over arm with a 4” pipe is the only thing that will help. The DC connection for the cabinet is for trying to keep the box clean. I was wondering how massive is you DC?? To have proper flow in an 8” pipe you must have like a 10hp unit with an 18” impeller. I don’t know what you have, but be careful. Oversizing the pipe is a bad Idea. If the pipe is too small the volume of air drops. And if it too big you lose airspeed, which means crap left in the pipe. All Im saying is make sure you have your facts cause the building sounds great and I would hate to see you have to change out the DC after the fact.

View Manitario's profile


2630 posts in 2877 days

#4 posted 03-23-2014 07:23 PM

I have a blade shroud (Sharkguard) with a 4” port and a 4” port on the TS cabinet; this combo picks up the majority of dust produced from the TS.

-- Sometimes the creative process requires foul language. -- Charles Neil

View ,'s profile


2387 posts in 3541 days

#5 posted 03-23-2014 09:51 PM

Thanks guys. We have a delta cyclone DC with 5 HP motor, I’m not sure of the impeller size. I can say it has a ton if suction. At our last shop we had 2 elbows at 90 degree in order to elevate our inlet trunk to 10’ height. This time I increased the height of the DC itself so we will not have any 90 degree elbows which makes sense to assume as good as it did at our last shop, it will be even stronger at our new shop without any elbows.

Plus delta has an 8” intake on the body of the cyclone so it seems to make sense that 8” was specifiednfrom mfg. At our last shop we ran a 6” trunk. If I placed my arm inside a verticle drop the suction is strong enough to hold my arm in place.

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View buildingmonkey's profile


242 posts in 1541 days

#6 posted 03-24-2014 02:16 AM

You might want to go a short distance with 8” and then decrease to 7”. If you have the 6” pipe already, I’d just run that. Google Bill Pentz, there is enough reading on his website to make an expert of you.

-- Jim from Kansas

View Lee Barker's profile

Lee Barker

2170 posts in 2844 days

#7 posted 03-24-2014 01:49 PM

Good thoughts. Re: the Blum machine, I’m not optimistic you can do much good there. I hope we can hear from someone who has.

Those chips are so large and flung with such velocity that they’re going to be hard to divert. I ended up with an air nozzle blowing sideways across the table at the fence, just to keep chips out of the way for the next door. The last door on the cart had an (imaginary) sign which said, “Now you get to sweep!”



-- " his brain, which is as dry as the remainder biscuit after a voyage, he hath strange places cramm'd with observation, the which he vents in mangled forms." --Shakespeare, "As You Like It"

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