Fence Mounted Dust Extraction - Router Forums
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post #1 of 13 (permalink) Old 07-24-2009, 09:28 AM Thread Starter
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Default Fence Mounted Dust Extraction

I am building a Square, Hollow fence for my small table. 21" long and 4 1/4" square. It has a flange at the rear to clamp it to the table. It will have T grooves to allow a 5" split fence to operate. Where do I put the dust extraction point? Behind the cutter, or at one as it is on the Incra Wonder Fence? I can arrange square blocks to partition off the inside to reduce volume.I will extract by 2" dia flex tubing to my extractor. Above the split fence will be a length of Ttrack for one or two featherboards and adjustable end stops.
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post #2 of 13 (permalink) Old 07-24-2009, 10:53 AM
 
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Mike,

I have always had good luck mounting the port as close to the bit as practical.
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post #3 of 13 (permalink) Old 07-24-2009, 11:46 AM
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Can You Post a pic. I would like to see. I am with Tom, in the closer to the bit seems better, however, I know that is is all important that all leaks you can seal, the better the suction

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post #4 of 13 (permalink) Old 07-24-2009, 01:34 PM Thread Starter
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Just a bare box with the rear extension clamped to the small table. I will continue to use the Incra Ultra with the large table for the moment. No split fence or track yet, the box is biscuited but not yet glued up. I will cut a recess for the router bits to drop into, as well as the fence split fence and Ttrack arrangement. I have 2" od tube and a 2" id vac tool available. I am rather taken with the idea of end suction.
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post #5 of 13 (permalink) Old 07-24-2009, 04:59 PM
 
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Mike,
Looking at your picture, it appears that the fench is aligned from side to side rather than fron to back. Is this true? I don't think it really matters, just curious.

As for drafting the kerf from the end of your fench, is it possible to provide a clean out port and baffle the interior? That might be of use sometime.

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post #6 of 13 (permalink) Old 07-24-2009, 09:36 PM
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Mike, a couple of things I've learned about dust extraction: If using a low velocity, high volume device (typical 4" dust extraction), allow for plenty of airflow. Dust and wood shavings are dumb and bashful, they like to hide in the corners and stay there. Hard, non-porous surfaces allow wood byproducts to flow more freely into the dust containment system (think metal or hard plastic).
If you wish to mount the dust extraction opening on the small end of the box-fence, allow for some type of air flow opening on the opposing end. When the bashful pieces are hiding, you can always prod them along with a burst of compressed air towards their happy home.

Sawdust is not dirt
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post #7 of 13 (permalink) Old 07-24-2009, 09:36 PM
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Thats pretty good size. The suction will not be reduced much at all.

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post #8 of 13 (permalink) Old 07-25-2009, 04:19 AM Thread Starter
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The fence will fit on the table in a North/South or East/West configuration depending on what I am routing. I could fit access caps to the ends to facilitate cleaning. I thought of putting a fixed cap just to the left of the router bit port, thus only part of the tube could fill with dust and chips. Incra state " The built in dust collector offers the best dust removal system available."
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post #9 of 13 (permalink) Old 07-25-2009, 04:42 AM
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All my experiments over the years have indicated that having the extraction point as close to the source of the saw dust is the most effective.
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post #10 of 13 (permalink) Old 07-25-2009, 11:04 AM
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My extraction system isn't particularly pretty but seems to be effective and I am pulling from the end.
I have a fence pickup and a router pickup. I have a 3" flexible aluminum from the fence and a 1" ID vynl hose from the router pickup. both run into a piece of 3" PVC about a foot long with endcaps. One endcap has been bored to accept my 2-1/2" shopvac. Seems to be pretty effective. I close the fence completely when doing dados or something like that where the fence pickup really hasn't got much to do. This effectively redirects the majority of the vacuum to the router pickup.
Advantage here is that the dust doesn't have much to cling to except where the fittings are and since they are non-pourous it doesn't seem to hang there very much either.
Just my .02

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