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4" vs 2 1/2" pipes

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Forum topic by jacquesr posted 10-29-2014 01:11 AM 1026 views 0 times favorited 17 replies Add to Favorites Watch
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jacquesr

339 posts in 890 days


10-29-2014 01:11 AM

Hi,
Would appreciate some advice…
I bought a 2 1/2 kit from Lee Valley…
Now I realize the dust collector I will be uses 4” intake.

My tools mostly use 2 1/2 adapters.

Should I:

A) Use 4” pipes all the way and convert to 2 1/2” as close as possible to the tool
B) Convert to 2 1/2 right at the DC and run 2 1/2 throughout…

Maximum run will be 15”, 2HP DC

Thanks


17 replies so far

View DIYaholic's profile

DIYaholic

19180 posts in 2142 days


#1 posted 10-29-2014 01:40 AM

Option A!!! Utilizing as little flex hose as possible.

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

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jacquesr

339 posts in 890 days


#2 posted 10-29-2014 01:48 AM

Thanks – but I also have this:
http://www.leevalley.com/en/Wood/page.aspx?p=62594&cat=1,42401,62597

So I can run rigid pipe almost all the way.

My guess is that with 2HP, I will have enough pull that A or B won’t make much difference….
But maybe I am wrong…. THANKS

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DIYaholic

19180 posts in 2142 days


#3 posted 10-29-2014 02:28 AM

That tube system is for a shop-vac based dust collection system. Your 2HP DC will be choked and not work as effectively utilizing it. Option A is the way to go.

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

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jacquesr

339 posts in 890 days


#4 posted 10-29-2014 02:30 AM

10-4. Thanks

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buildingmonkey

242 posts in 1014 days


#5 posted 10-29-2014 02:45 AM

I have a 2hp cyclone, and I use 6” pipe. Moves 2 times the air as 4”.

-- Jim from Kansas

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jacquesr

339 posts in 890 days


#6 posted 10-29-2014 02:50 AM

Well… you maybe 2HP is overkill then…. My little work space is in the basement of the home.
A nice basement…. So I am trying to not generate any dust outside of the room.
Longest run will be 13-15’. Maybe I would be OK with 1.5HP?
Thanks for your help

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timbertailor

1592 posts in 891 days


#7 posted 10-29-2014 01:31 PM

The rule of thumb is, you can never have too big of a dust collection system.

6” pipe is recommended, along with, 3HP minimium.

Option is to do what I did. I use a 2hp unit but only have one machine hooked up at a time. Keep the hose runs short. I use 4” all the way to the machine. See “my projects”. I am currently converting all the ports at the power tools to 4” ports.

-- Brad, Texas, https://www.youtube.com/user/tonkatoytruck/feed

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jacquesr

339 posts in 890 days


#8 posted 10-29-2014 01:40 PM

Hi,
Thanks for chiming in.
I am starting to have a better idea of what to do.
A key issue I have is that many of my tools including my tablesaw only have 2 1/2 inch boards.
A guy from Oneida this morning suggested that I go with the Dust Cobra.
It seems it would be sufficient for my needs. I also like the fact that it is a all in one solution (includes cyclone).
Also I could technically sell my fist to CT 26.
Since my tools are not functioning as of yet, I will wait and for now just use my festal to get a better idea of how that works to help me evaluate how the cobra could work. I am not sure how much work is involved and converting my dust boards to 4 inches. But they will study that as well.
I understand that a true HP desk collector with 4 inches by will give me a better results. But for me it’s just a hobby. thanks!

View CharlesA's profile

CharlesA

3025 posts in 1264 days


#9 posted 10-29-2014 01:49 PM

Jacquesr,

It’s your money, but a Dust Cobra is an awful lot of money to spend for that level of dust collection.

To each his own . . .

-- "Man is the only animal which devours his own, for I can apply no milder term to the general prey of the rich on the poor." ~Thomas Jefferson

View verdesardog's profile

verdesardog

137 posts in 2078 days


#10 posted 10-29-2014 02:11 PM

But remember your pipe should be sized according your your power source (fan, motor, impeller etc)...velocity is what keeps particles moving in the pipe. If your pipe is too large you won’t have the necessary air speed to be effective.

-- .. heyoka ..

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jacquesr

339 posts in 890 days


#11 posted 10-29-2014 02:56 PM

well, Charles, I agree with you.
But a CX400
http://www.busybeetools.com/products/DUST-COLLECTOR-2HP-W%7B47%7DCANISTER-CSA.html

+ a dust deputy (or a super dust deputy) get me close…
I agree of course that there is way more succion that way

===

As for pipe size, a 2HP will work well with 6”. My problem is some tools have 2 1/2 outlets. So I have to check how to convert them to 4’

View mrg's profile

mrg

659 posts in 2466 days


#12 posted 10-29-2014 09:45 PM

All you need is a reducer from 4” to 2 1/2”.

-- mrg

View JAAune's profile

JAAune

1646 posts in 1783 days


#13 posted 10-29-2014 11:43 PM

I don’t know what the OP’s equipment looks like but I’m the sort of person that won’t hesitate to cut into my machinery to install bigger dust ports. Bandsaws look odd with 4” pipes going into them but it sure makes for efficient dust collection.

-- See my work at http://remmertstudios.com and http://altaredesign.com

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jacquesr

339 posts in 890 days


#14 posted 10-30-2014 12:27 AM

Well, went full circle today.
My quest started with the fact that a 2HP DC needed 6’ pipes… and reducing that to 2 1/2 for my saw could have been a problem. Mind you I am just readying my little workspace – I have received most tools and assembled them, but no experience with them. DC is a must in my case, shop is the basement, just a door away from family room…
Spoke with a very nice rep art Busy Bee today. He has a small cabinet ship himself so he has real ice knowledge of all this.

Long story short, 1HP is plenty enough for my setup. On 4” pipes. So I will jet try a reducer to the Delta, and see how it goes. I could eventually play with the shroud, but it’a metal and it seems complicated to remove it.

This DC will give me 5X the suction I would get with my CT26. Should suck all right!

Time will tell, thanks for chiming in

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buildingmonkey

242 posts in 1014 days


#15 posted 11-03-2014 01:07 PM

You didn’t list what machines you have that you will be collecting dust from, so hard to tell what you need. My sanders are hardest to collect dust from, so much fine dust, the edge sander I cut the flange off, made a 6” steel ring, and welded it on with my Harbor Freight wire welder, cost 90$ on sale. Now I get most of the dust. Have increased the flanges on my table saw, it was 4” and hardly did any good. Used a plywood piece, cut out 6” and put a piece of 6” pipe and used silicone to seal between the pipe and the wood, and screws to hold it together. Helped some, but you need to collect above the blade as well.

-- Jim from Kansas

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