downdraft table?
#7
  
Am in the process of making a downdraft table and have a question. My table will be about 24" x 48". am wondering what size holes and spacing should be. Any suggestions?
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#8
  Re: downdraft table? by Stamper (Am in the process of...)
When I made mine in the old shop I went 3/4"holes 2" on center. Not as large as yours, but a fairly small fan was strong eneough that I could put a piece of wood on it and use a belt sander with no added hold down of any kind. Worked great. Now I do mostly turning so didn't put one in this shop. It worked better than any other kind of dust collection I have tried while sanding
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#9
  Re: downdraft table? by Stamper (Am in the process of...)
I just built one and used back braced peg board for the top.  I tested it by sanding a pair of cutting boards, and everything flowed down.
Mine is a large box, I hook to the dust collector, then store out of the way when not in use.  So far, so good. There was enough suction that the cutting boards were "held" in place while I sanded.
Smirk
Jim in Virginia
You can tell a lot about the character of a man -
By the way he treats those who can do nothing for him.
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#10
  Re: RE: downdraft table? by BrokenOlMarine (I just built one and...)
(01-16-2020, 09:34 AM)BrokenOlMarine Wrote: I just built one and used back braced peg board for the top.  I tested it by sanding a pair of cutting boards, and everything flowed down.
Mine is a large box, I hook to the dust collector, then store out of the way when not in use.  So far, so good. There was enough suction that the cutting boards were "held" in place while I sanded.
Smirk

Ditto...
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#11
  Re: downdraft table? by Stamper (Am in the process of...)
When I made my downdraft/air cleaner, I incorporated it into my 54" TS extension table, and simply made a grate of half lapped 1 by 2s to cover the opening and filters below.   

I used a HVAC blower and stacked two sets of two filters above the blower.   Its worked quite well as a DD table and a hepa air filter.   Placing cheaper filters on top significantly extends the useful life of the more expensive HEPA filters



Clicking the pic will lead to more...
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#12
  Re: downdraft table? by Stamper (Am in the process of...)
A couple pics....

My sanding box frame glued and screwed.  The connection for the dust collector can be seen at the far end.
   

The angled bottom reduces the interior volume of the box and increases the suction applied by the Dust Collector.
   

Top cut to size, but not yet screwed down.  Once I screwed it down it was flush in the rabbits.
   

Ready for use...
   

I screwed the top down so that if I needed to access the box interior I could removed the eight screws and do so.  So far the box functions perfectly.  I added the sanding mat to protect the projects being sanded.  The suction still holds items in place as long as they have a flat surface to suck against.  Crazy
Jim in Virginia
You can tell a lot about the character of a man -
By the way he treats those who can do nothing for him.
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