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Dust collection advice needed

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Forum topic by jesinfla posted 04-09-2016 12:22 PM 663 views 0 times favorited 8 replies Add to Favorites Watch
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jesinfla

274 posts in 603 days


04-09-2016 12:22 PM

Hope this is the correct place to post, if not please move as needed….

I have the HF 2hp collector and I run 4” sewer piping across my ceiling off it (HD piping $7.00 each for 10’).

From it I have a 4 -2 ” adapter and run 2” flex hose to my table saw – that’s about 10’ of 2” coming off the main pipe – My table saw has a 2” port..

I add 20’ of 2” hose lengths to reach across the floor when I set up portable tools (the table saw is not connected at this point so it’s a straight line with no T’s) – they all have 2” connectors.

The question is – I am considering adding an additional 4” 20’ section off a T section from the main pipe and drop down with the 5’ 2” flex hose.

In essence… Instead of running the 2” for 20’, I’d run the 4” for 20’ and drop down the 2” for 5’

Basically I’m asking which is better, 20’ of 2” or 20’ of 4” adapting down to 2” for the connection to the tools?

Also the dust collector has Y outlet port (I only use 1 of the ports and the other is closed off) – would it be better to connect the 2nd line to that or T off the main line?

Hope I didn’t confuse the heck out of you – but thanks in advance for any and all advice – it’s greatly appreciated

-- They said I could be anything... So I became Sarcastic! They also said making drawers is easy... I think they lied :(


8 replies so far

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kdc68

2526 posts in 1742 days


#1 posted 04-09-2016 12:39 PM

I’m no dust collection expert, just a rookie opinion….Between the two options you posted the 4” would be better. I will assume that if your collector is at one end of your shop then use one main line, or if it is in the middle (tools on either side) then branch off the Y. Use blast gates at each tool and in the run, minimal flex hose, and drops to 2” as close to the tool as possible.
v
Hope others will post with more advice

-- Measure "at least" twice and cut once

View GT350's profile

GT350

352 posts in 1447 days


#2 posted 04-09-2016 03:15 PM

Maybe it’s because I only have a 1.5 hp dust collector but mine doesn’t do well when I reduce it down to a 2” hose. My old Rockwell bandsaw didn’t have a dust collector port so I installed a 2” port from Jet on it and I found that the shop vac actually did a better job even when I ran a 4” hose right up to the 2” adapter, my new saw has a 4” port and it works great. I would definitely run the 4” and if there is a way change the port to a 4” I would.
Mike

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TheDane

4997 posts in 3129 days


#3 posted 04-09-2016 03:25 PM

Like kdc68, I am no expert, but I would avoid using ‘T’ fittings. Substitute ‘Y’ fittings wherever possible … has significant effect on air flow.

-- Gerry -- "I don't plan to ever really grow up ... I'm just going to learn how to act in public!"

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jesinfla

274 posts in 603 days


#4 posted 04-09-2016 03:33 PM

Thx guys – I need to post more pics to get a better idea of how it’s set up – it’s far from optimum but it’s all I have.

I haven’t seen a 4” Y that I could use except the one that comes out of the dust collector.

I ordered some 4” blast gates since I only have 2” at the moment – I don’t want to adapt down, install 2” gate, adapt up etc.

As far as a 4” port, the table saw port I don’t see how to convert it – but I do have a few 2-4” adapters I can use. I’ll try that and see if there enough of a difference.

The other tools have variable size ports and some have nothing at all so I made a few attachments to control as much of the dust as possible. I’ll post some more pics as I use the tools to get a better idea of my limitations LOL

Thanks for all the advice – greatly appreciated – going to get a remote control today for the dust collector.

-- They said I could be anything... So I became Sarcastic! They also said making drawers is easy... I think they lied :(

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jesinfla

274 posts in 603 days


#5 posted 04-09-2016 04:00 PM

I’ve piosted some updated pics of my layout and shop.

http://lumberjocks.com/jesinfla/blog/82922

You can see the issue with the hose going across the garage LOL

-- They said I could be anything... So I became Sarcastic! They also said making drawers is easy... I think they lied :(

View kdc68's profile

kdc68

2526 posts in 1742 days


#6 posted 04-09-2016 04:53 PM


I ve piosted some updated pics of my layout and shop.

http://lumberjocks.com/jesinfla/blog/82922

You can see the issue with the hose going across the garage LOL

- jesinfla


v
The ribs on the inside of that hose across the joist bay is a airflow killer. Since your shop doubles as a garage for a car (who does that), you may consider taking advantage of the mobile base on the collector and wheel it nearby your work area and plug in one tool at a time. When shop time is over and a car needs parked, wheel it away when you put the tools back in there storage place. But if you want hard ducting, then fittings are available to transition from pvc to 4” and 2” dc ports and hoses
v
I think an example of what you may need is posted below
v
http://www.rockler.com/4-hose-connector-for-pvc-sewer-pipe

-- Measure "at least" twice and cut once

View KDO's profile

KDO

145 posts in 2235 days


#7 posted 04-09-2016 04:55 PM

Depending on where you are in FL, there are some Local sources for Dust collection fittings.
Look up Woodcraft and Rockler on the Internet.
Also places like Peachtree www.ptreeusa.com (in Atlanta) and Penn State https://www.pennstateind.com have a lot of dust collection stuff.
The basic rule of thumb, keep your runs to the absolute minimum, use the 4” instead of 2” when you can, use wye’s instead of tee’s, use fixed (ridged, slick interior) pipe as much as possible-the flex pipe causes turbulence and decreases efficiency.
You are on the right track. Half of the fun is figuring out stuff.
Enjoy !

-- Christian, Husband, Grandpa, Salesman, amateur Woodworker.

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JBrow

819 posts in 386 days


#8 posted 04-09-2016 07:00 PM

jesinfla,

I did a little research before upgrading my dust collection system. While I am no expert, from what I understand about dust collection, I agree that if at all possible, up-sizing from 2” to 4” piping, using Wye fittings rather than T fittings, keeping duct runs as short as possible, and eliminating as much flex hose as possible will likely improve performance, probably by a fair amount. The reason is that these improvements reduce static pressure (resistance to air flow) and thus improve air flow. Air flow must be maintained at 3500 feet per minute (fpm) in branches and 4000 fpm in the main line. Failure to maintain these velocities can result in debris settling in the ducts.

A 2” pipe has a cross sectional area of 3.1 square inches while a 4” pipe has a cross sectional area of 12.6 square inches ; 4 times the air can flow through a 4” pipe than a 2” pipe. Once air moves into the 4” pipe from a 2” pipe or 2” fitting, the air velocity will slow a good bit. A T-fitting, corrugated flex hose, and long runs of pipe add to static pressure and reduce air velocity.

Having enlarged dust ports on several of my machines, I know this is a difficult job but it pays big dividends in the end, especially when going from 2” to 4”. This single improvement would be I believe the biggest performance enhancement that can be made.

As far as blocking off one of the machine dust ports or using both, I would think either is ok, so long as when one leg is used the other is blocked with a blast gate, if not permanently closed off. Blocking one leg permanently would save the cost of two blast gates, but would affect the layout of your duct work since there would only be one main branch rather than two.

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