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Simple effective air blast gate

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Project by Garry posted 205 days ago 1722 views 14 times favorited 6 comments Add to Favorites Watch

Having read blast gate reviews, LJ projects, and researching the internet, I came up with my own design that appears to be uncommon if not unique. Rather than a push-pull gate, I developed a rotary design that seems to work well. One advantage is that it can’t jam like the push-pull type due to saw dust building up in the tracks.

The ones pictured are for 2” PVC. Dimensions are 8” wide by 4.5” tall case and 7” round discs. Stops on the discs position the opening in the gate exactly in line with the opening in the case. A finish nail serves as a simple pivot pin.

I used this concept to construct an air manifold for my dust separator shown with one connection on one end and two in the bottom.

-- Garry, North Carolina woodworker and engineer - The journey you're preparing for has already begun.





6 comments so far

View bd187's profile

bd187

33 posts in 459 days


#1 posted 205 days ago

NICE. Would love to see a video of how it works.

-- Never bite the hand that feeds you, but always watch the hand that's cooking.

View Garry's profile

Garry

98 posts in 311 days


#2 posted 205 days ago

Here’s a photo and a short video of the blast gate. The disc is 1/8” hardboard. I clamped everything together and made a 2-3/8” opening with a hole saw. A doubler was included to give more glue surface for the PVC connection. I wasn’t sure how to bond the PVC to the wood. I tried using the same solvent and glue for regular PVC joints and it seems to work okay but I haven’t really tested it. A 2” PVC female NPT adapter worked out as a good adapter to use with 2-1/2” vacuum hose. I flattened the threads about half way to get a good push fit on the hose.

To get a slip fit on the disc, there are hardboard spacers where the screws attach. I added one thickness of tape to get a few thousandths clearance but it may not be necessary. The screws can control the pressure on the disc.

The outlets for the table saw and router come out the bottom so you can see the horizontal disc for the router below the hose connection. The wooden stops were glued on while everything was still clamped up after drilling so the open alignment is repeatable.

http://www.youtube.com/watch?v=tpi1q8fCQuY

-- Garry, North Carolina woodworker and engineer - The journey you're preparing for has already begun.

View Roger's profile

Roger

14090 posts in 1399 days


#3 posted 204 days ago

Looks like this would work very good

-- Roger from KY. Work/Play/Travel Safe. Kentuk55@bellsouth.net

View a1Jim's profile

a1Jim

111999 posts in 2172 days


#4 posted 204 days ago

Good Idea ,well done.

-- http://artisticwoodstudio.com Custom furniture

View Randy_ATX's profile

Randy_ATX

664 posts in 1037 days


#5 posted 204 days ago

Tried to watch the vid – it’s marked as private.

-- Randy -- Austin, TX by way of Northwest (Woodville), OH

View Garry's profile

Garry

98 posts in 311 days


#6 posted 204 days ago

Sorry about that. I changed the settings so the video should be available now.

-- Garry, North Carolina woodworker and engineer - The journey you're preparing for has already begun.

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