This view shows the back side of my recently refurbished TS. There are ~46” between the saw and my primary work bench. I lowered the bench to match the height of the TS @ 32-7/8” and planned to bridge the two with an outfeed table…. but I wanted to do something different with it.
Since I have two 4” DC lines running back there, I figured this would be a great place for a down draft table.
Here’s the preliminary design…
To maximize air flow, I figured I’d ‘Y’ off of both 4” lines to the bottom, minimizing bends and bends in the flex hose. And rather than buy two blast gates, I figured it would be easy to fabricate a two hole gate into the bottom…. like this”
Reading up on the topic, I decided to size the hole at 1/2” diameter, with a pattern of 3/4” holes added, so I can use my plastic bench dogs to secure the pieces I’m sanding.
Bill Pentz has some very good info on his sight on the topic of down draft tables, but it’s difficult to know what numbers to use, since the published stats on my Grizzly single stage canister DC are pretty ambitious. Grizzly advertises , 1,700 cfm with 10” static pressure drop…. so I figured if I was really pulling 800 scf, I was probably doing pretty well. Fortunately, BP’s Q&A on the topic published some design numbers for a similar capacity setup, so I used that as my guide.
-- Pine is fine, but Oak's no joke!