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Which is better DC option?

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Which is better DC option?

#1

A.J. Hamler

Which is better DC option?

A.J. Hamler

Hi guys...

I'm finally getting to the last area of my shop build (after a year-long delay), and it's coming along great. The last thing I'll do here is add dust collection. I've thought about it a lot and have come to the conclusion that the most air-efficient path is one of two options, but have to admit that I am not an expert -- or even close -- when it comes to air handling. I can either...

A) Take the most direct path, requiring the least amount of ducting. However, this path will require two 90-turns. There is no way around this -- no doubling up 45's, no wide-radius elbows, etc. There is no alternative on this most-direct path but to include two 90-degree turns.

-or-

B) Take a less direct path where I can eliminate the 90-degree turns, replacing them with multiple 45's or a wide radius, but this path would require up to 8' or more additional duct length.

There are no other options I can really consider; it has to be one of these two. Which is my better choice?

Two factors to consider: The dust that will be collected by this duct run will be fine sander dust, not heavier chips. The duct run for either option is less than 20' total, so it's not a particularly long run either way.

TIA,

A.J.

Re: Which is better DC option?

#2

IIRC

Mark Mandell - Gone Round In New Jersey

A 90° bend equals 15' of duct whereas a large radius (45/45) is less than half that. Don't have the formula tables handy.

Re: Which is better DC option?

#3

Re: Which is better DC option?

Hank Knight

When I was researching my dust collection installation, I learned that 90 degree turns are killers. Two 45s are way better than one 90. Like Mark, I don't have the data handy (that was 10 years ago), but if I were in your shoes, I'd take the longer route and get rid of the 90s.

My $.02

Hank

Re: Which is better DC option?

#4

Re: Which is better DC option?

Jesse Cloud

I agree with the others who suggested the longer route with no 90 degree turns.

Having said that, though, my current configuration is very similar to your first option: 25 feet, two 90 degree turns with a 2 HP cyclone at the heart. I have the big chip machines (tablesaw, jointer, planer) in an early straight run, then sanding stuff toward the end. It works fine.

Re: Which is better DC option?

#5

Re: Which is better DC option?

JohnV

My opinion on 90's is somewhat different. I assume 4 or 5" piping. with dust not coarse shavings 90's never caused me a problem. There is some loss of velocity with a 90 but for most users the difference wouldn't be critical. especially with an efficient 2hp unit.

Re: Which is better DC option?

#6

Re: Which is better DC option?

BrianFromMonumentCO

Why not contact Oneida and pose the questions to them. They are the experts. Send them a diagram of your shop and specs for the tools you want to DC and their proposed locations and see what the experts say. Just my 2 cents worth.

Re: Which is better DC option?

#7

Re: Which is better DC option?

Larry verhff

AJ One thing I would do is use PVC pipe, I put it on my Oneida over 10 years ago and had no trouble with it at all. It`s so much easyier to put in and the air travels faster also. I forget the persons name but years ago someone did a great amount of reserch on dust collection it is worth reading. Maybe someone can chime in and tell us who it was. Good luck Larry

Re: Which is better DC option?

#9

A.J. Hamler

Thanks!

A.J. Hamler

Thanks, guys. This is all really helpful.

I'll let you know how it turns out.

A.J.

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