Request information: 6" Dust Collection Hoods - Router Forums
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post #1 of 16 (permalink) Old 06-26-2009, 08:58 PM Thread Starter
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Default Request information: 6" Dust Collection Hoods

I have a Jet DC1100A DC which can use either a 6" hose or two 4" hoses. At this time it will be roll-around. As a one-man shop, most of the time I'd have no use for 2-4" connections, so am looking at going with one 6", especially since my new TS will have a 6" connection.

Can anyone point me in the direction of 6" universal hoods I could attach to various tools? It (generally) seems like a waste to neck down and introduce a restriction right at the tool.

My Wonderfence has a shop-vac size, so I was thinking of parking my shop-vac there and using the DC for under the table.

Similar for my jointer, which currently has no hood at all.

Thanks,

Jim

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post #2 of 16 (permalink) Old 06-26-2009, 11:48 PM
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Jim, do not wory about using 4" accessories with your 6" system.You will still pull the same volumn, just a higher flow rate.

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post #3 of 16 (permalink) Old 06-27-2009, 12:22 AM Thread Starter
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Mike,

I disagree with you. To move the same amount of air through a 4" pipe as through a 6" pipe, the velocity would have to be 3^2*PI/2^2*PI = 9/4 as fast. Thus air with a 6" speed of 4000 ft/min would have to travel 9000 ft/min.

Drag in air varies with the cube of the velocity, so the drag is (9/4)^3 = 11.4, meaning that one foot of 4" pipe would take 11X as much pressure drop to move the same amount of air as in a 6" pipe. Said another way, using 6' of 4" hose would equate to 66' of 6" pipe.


With dust collectors we only have about 9"-12" of vacuum to deal with, so the result is less air. If I was using a shop-vac that could draw 80 or 90" of vacuum the effect would not be so pronounced.

Sorry about all of the technojargon, Mike. I had a class in HVAC design back in engineering school... in the dark ages.. B.C.... Before Computer.

I've just been researching on from what I"ve learned from Bill Penz of fine dust and shop safety. Its a really good site from someone who explains his medical problems due to dust in a technical manner and isn't trying to sell you anything. He also offers free plans for a built-it-yourself cyclone dust collector based upon his findings. I used to not be bothered about picking wood-b**gers the day after woodworking but I'm trying to change as I've become AARP-qualified!!

I may need to make my own or use 2 ea 4" runs if I decide I need the extra air.

Jim

One thing though.. it can't collect more than 100% of the dust; if 4" does it, it does it!! I just want to ensure enough volume to get the fines too.

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post #4 of 16 (permalink) Old 06-27-2009, 01:19 AM
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Hi Jim

You can always use the floor sweeps and sanding hoods with just a little bit of rework

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post #5 of 16 (permalink) Old 06-27-2009, 01:20 AM
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Hi Jim

You can always use the floor sweeps and sanding hoods with just a little bit of rework

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Last edited by bobj3; 06-27-2009 at 01:41 AM.
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post #6 of 16 (permalink) Old 06-27-2009, 01:33 AM
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I don't worry about the big chips. Those can be picked up with a vacuum or broom and dust pan. It's the fine dust that does the damage... thus the term "Dust" Collector, not "Chip" collector. It takes a high CFM to keep the small particles air borne to get to the collector. The bag needs to be at least .5 micron or smaller to catch the really bad stuff.

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post #7 of 16 (permalink) Old 06-27-2009, 01:49 AM
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Hi George

My system will do both,,the dust and the big chips, one bag on the top side for the dust and one on the bottom for the big chips,,,it will suck up 2 x 4 chips easy.. I will now and then need to pull off the hoses to pull out the big 2 x 4 chips...

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post #8 of 16 (permalink) Old 06-27-2009, 10:30 AM
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This outfit, Nosawdust sells some. Model number 426 is a 6" universal flange that could be modified and used for just about anything.

I have an old Delta DC with 30 gal. barrel on wheels. It has a 4" hose with the exhaust side ported to another 4" hose instead of a bag or filter. Most of the chips and dust stay in the barrel with only a little fine dust out the exhaust hose. Since there is no back pressure on the exhaust side, it functions very well. I run the exhaust hose to the outside of the shop area, resulting in no worry about the fine stuff.

Sawdust is not dirt
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post #9 of 16 (permalink) Old 06-27-2009, 12:25 PM
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Hi Lance

Thanks that's a great link

http://www.nosawdust.com/index.htm

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post #10 of 16 (permalink) Old 06-27-2009, 12:38 PM
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yep, it sure is...
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