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Downdraft Sanding Table

This is a discussion on Downdraft Sanding Table within the The Finishing Touch forums, part of the General Woodworking category; Hi- I am going to build a downdraft sanding table which will hook up to ...


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Old 07-14-2009, 02:23 PM   #1 (permalink)
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Hi- I am going to build a downdraft sanding table which will hook up to my dust collector (1.5 hp, 1200 cfm, Jet cannister dust collector). I plan to mount it on my workbench via a couple of clamps in use and want it to be portable to store away when not in use. I'm thinking of making it roughly 18" x 24". It will probably have detachable or fold up wings to aid in dust collection. The dust collection hookup would probably be on one side or maybe the back. Right now, I'm thinking of using either spaced slats or pegbard with the holes drilled out a little for the sanding surface.

I am looking for any ideas/plans anyone has. I'd be especially interested in hearing from anyone who has built a table, used it for awhile and has an opinion as to what design features are most important. Any ideas you could offer would be most appreciated.

Thanks in advance.

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Old 07-15-2009, 12:10 PM   #2 (permalink)
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There is a simple plan for a portable downdraft table from Woodsmith. You might be able to modify it to your needs.
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Old 07-15-2009, 01:12 PM   #3 (permalink)
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rstermer,

Here's a good site on one persons experiments in sizing and designing a downdraft table.

Bill's Cyclone Dust Collection Research - Dust Collection Downdraft Table

I've mentioned Bill before regarding dust collection. I don't take him as the end-all of DC but he has far more research in one place on the topic than I've seen anywhere else. It'd be worth your time to look over the site; he provides the basis for his findings so you can reality-check them yourself.

I'm still digesting some of the ramifications of some of his findings. They seem legit.

Jim
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Old 07-15-2009, 04:33 PM   #4 (permalink)
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Originally Posted by CanuckGal View Post
There is a simple plan for a portable downdraft table from Woodsmith. You might be able to modify it to your needs.
Thank you, CanuckGal. That one looks easy to build. I do think wings are necessary to prevent dust escaping, but they would be easy to add.
Regards,
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Old 07-15-2009, 04:40 PM   #5 (permalink)
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rstermer,

Here's a good site on one persons experiments in sizing and designing a downdraft table.

Bill's Cyclone Dust Collection Research - Dust Collection Downdraft Table

I've mentioned Bill before regarding dust collection. I don't take him as the end-all of DC but he has far more research in one place on the topic than I've seen anywhere else. It'd be worth your time to look over the site; he provides the basis for his findings so you can reality-check them yourself.

I'm still digesting some of the ramifications of some of his findings. They seem legit.

Jim
I've been doing a lot of reading on his website. It is scary stuff and should motivate anyone who thinks dust is something one can disregard to think otherwise. My main takeaways are that the downdraft table can't be too big or the dust will escape and that it is necessary to add baffles on the sides of the box to prevent the dust from escaping, which, if it does, really means it is going to be floating around for awhile.
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Old 07-18-2009, 02:57 AM   #6 (permalink)
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Check out the build by TRN_Diesel in his gallery @ http://www.routerforums.com/show-n-t...g-station.html. You might get some ideas from this project.
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Old 07-19-2009, 07:31 AM   #7 (permalink)
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Check out the build by TRN_Diesel in his gallery @ http://www.routerforums.com/show-n-t...g-station.html. You might get some ideas from this project.
Thanks for posting that. Diesel does nice work and I learned a lot just looking at his posts.

A couple of thoughts though. Using a shop vac to collect the dust is almost certainly not effective and even a 600 cfm dust collector is probably too small. If one was going to build the table he built, probably a 1250 cfm dust collector and 6" ducting would be required for it to be effective, the size is quite large and so lots of cfm are required. That is just an estimate because I don't know the exact size, more info can be found here:

Bill's Cyclone Dust Collection Research - Dust Collection Downdraft Table

Also, the design could be improved by the addition of a slanted baffle in the dust collection chamber running from the top front of the table to the back bottom near the collection port.

Finally, my reading indicates it really appears to be necessary to add walls around the outside to help contain the dust. Once the dust gets past the edge of the table, it is not going to be collected by the downdraft table.

Thanks again for the reply, very interesting build!
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Old 07-19-2009, 09:25 AM   #8 (permalink)
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I've been wanting to build one to sit on top of the router table. Take the router and insert out, put the box on top, turn on the DC and go to town.
The table is 24x36 so that should be big enough for most things I do.
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Old 07-19-2009, 10:55 AM   #9 (permalink)
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I've been wanting to build one to sit on top of the router table. Take the router and insert out, put the box on top, turn on the DC and go to town.
The table is 24x36 so that should be big enough for most things I do.
That's a great idea, it appears one needs approx. 800- 1000 cfm to make that work, which is very doable.
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Old 07-19-2009, 10:55 PM   #10 (permalink)
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I really like that idea, Mike. Brilliant!
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