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Forum topic by Superman32 posted 01-25-2021 01:33 PM 263 views 0 times favorited 7 replies Add to Favorites Watch
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Superman32

3 posts in 35 days


01-25-2021 01:33 PM

Topic tags/keywords: dust collection

Can someone help me?
I am setting up a dust collection system with 4 inch pvc. My question is attaching 45’s to straight pvc pieces. I have one section of two 45’s attached to a short straight piece but inside there is a a big valley I guess you can call it is a good 1/2 inch. The pieces are attached securely and put tape on outside. Is the valley going to interfere with the dust collection.
Thanks david


7 replies so far

View Fred Hargis's profile

Fred Hargis

6831 posts in 3502 days


#1 posted 01-25-2021 02:02 PM

Not enough to notice. I’m sure that joint causes some turbulence and drag, but it would take laboratory quality instruments to measure it. Over time there will be a small build up of fine dust in there, but that’s also nothing to worry about.

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

View ibewjon's profile

ibewjon

2267 posts in 3801 days


#2 posted 01-25-2021 02:08 PM

That is how pvc goes together. The female side has a slight taper so the male side will not bottom out and make a smooth joint. As Fred said, it probably won’t cause any problems.

View Blindhog's profile

Blindhog

184 posts in 2057 days


#3 posted 01-25-2021 02:23 PM

If possible, you can use a sweep in lieu of 45s, that will help with smoother flow/less resistance.

Just a thought….....

-- Don't let perfection get in the way of plenty good enough

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ibewjon

2267 posts in 3801 days


#4 posted 01-25-2021 03:16 PM

Or go with steel duct with long radius 90’s. And the plus is no shocks off of steel. And about the same price as pvc.

View tvrgeek's profile

tvrgeek

1419 posts in 2658 days


#5 posted 01-25-2021 08:54 PM

4” won’t cut it for most things. Sorry. Have you read all of Bill Pentz papers on the subject? I use 4 inch only for the drop to my spindle and disk sander. I will probably drop a 4 inch to a blade guard on my TS, but even the drop to my TS and BS will be 6 inch. BS splits the 6 to two 4’s right at the ports. 6 inch right into the TS base. 4 inch port to connect my jointer and planer, as they are only chip collection, no dust to speak of. Same port will feed a 4 to twin 2 1/2 for the top and bottom of the router though I suspect it will be inadequate.

Log sweep metal are really expensive. I am using two adjustable 45’s to make a longer radius.

PVC will not meet code in a lot of places. You can run a bare wire through it, or some run a screw in every couple of feet all wired to ground. 6 inch spiral duct is really expensive, but so are my lungs.

You can get a little aerometer to measure velocity pretty cheap. I was quite surprised. Not only did it prove to me 6 inch is required, but I will probably upgrade to a 3 HP system. Then the trunk from DC to the miter hood and split to the overhead 6 inch will move up to 8 inch.

View Robert's profile

Robert

4440 posts in 2489 days


#6 posted 01-25-2021 11:39 PM



4” won t cut it for most things. Sorry. Have you read all of Bill Pentz papers on the subject? I use 4 inch only for the drop to my spindle and disk sander. I will probably drop a 4 inch to a blade guard on my TS, but even the drop to my TS and BS will be 6 inch. BS splits the 6 to two 4 s right at the ports. 6 inch right into the TS base. 4 inch port to connect my jointer and planer, as they are only chip collection, no dust to speak of. Same port will feed a 4 to twin 2 1/2 for the top and bottom of the router though I suspect it will be inadequate.

Log sweep metal are really expensive. I am using two adjustable 45 s to make a longer radius.

PVC will not meet code in a lot of places. You can run a bare wire through it, or some run a screw in every couple of feet all wired to ground. 6 inch spiral duct is really expensive, but so are my lungs.

You can get a little aerometer to measure velocity pretty cheap. I was quite surprised. Not only did it prove to me 6 inch is required, but I will probably upgrade to a 3 HP system. Then the trunk from DC to the miter hood and split to the overhead 6 inch will move up to 8 inch.

- tvrgeek


I agree with all of this!

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

View pottz's profile

pottz

14799 posts in 1993 days


#7 posted 01-25-2021 11:41 PM

ive got a double 45 situation in several places in my shop.it’s no issue.im using 4” throughout my shop from a 2hp jet dc with no problem.

-- working with my hands is a joy,it gives me a sense of fulfillment,somthing so many seek and so few find.-SAM MALOOF.

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