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Fighting Dust #12: DIY Blast Gates pt 2

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Blog entry by ChunkyC posted 01-21-2012 06:51 PM 4974 reads 2 times favorited 7 comments Add to Favorites Watch
« Part 11: DIY Blast Gates pt 1 Part 12 of Fighting Dust series Part 13: DIY Blast Gates pt 3 - Dimensions »

I assembled a second blast gate this morning in the shop and got it installed. So far, everything is working much better than I had expected. I feel that I’m being more and more like Sheldon Cooper every day, Whistling in the workshop is NOT allowed. Good thing to because these gates are nice and quite. These gates have eliminated the whistling that was being caused be leaking plastic gates.

Here’s some assembly and installation pictures for the table saw blast gate.
(Click for larger picture)

Notice that I had to flip the gate over once I installed the blast gate under the saw. I saved a few inches!

Front View

Side View

All assembled and ready to suck.

One thing that I was surprised by was that even with the “loose” tolerances the gates still seal. The only conclusion that I can come with is that the gate is being “sucked up” against the upper body and creating a seal. So one thing to watch out for when building your own, if you so choose to, is to make certain that the body is flat and smooth.

Even with laying everything on the workbench while I waited for the glue to dry, there always seemed to be a little bit of the pipe sticking through the body on the inside. So I made sure that I sanded the inside so that it was flat and smooth. For the cans, I used a file, always filing toward the body of the gate, to get it down even with the inside of the body and then sanding.

These are very simple and quick to build.

c

-- Chunk's Workshop pictures: http://spadfest.rcspads.com/thumbnails.php?album=135



7 comments so far

View buffalosean's profile

buffalosean

174 posts in 2134 days


#1 posted 01-21-2012 07:00 PM

cool stuff chunky.

you said:
“One thing that I was surprised by was that even with the “loose” tolerances the gates still seal.”

Is this with typical with several manufactures or just one in particular? I don’t use blast gates. i hook up each machine with quick clams as needed.

-- There are many ways to skin a cat...... but, the butter knife is not recommended

View ChunkyC's profile

ChunkyC

856 posts in 2001 days


#2 posted 01-21-2012 07:05 PM

I was referring to the gates that I made. The gates slide in a “loose” fit. There’s a gap all the way around the gate and the body and both ends are open. There’s lots of room for these gates to leak but they still seal rather well.

By “loose fit” I mean that if you put the gate in the body and installed it horizontally, the gate will slide through and fall to the floor when the DC is off. I know because one of mine did, hence the addition of the handle.

-- Chunk's Workshop pictures: http://spadfest.rcspads.com/thumbnails.php?album=135

View buffalosean's profile

buffalosean

174 posts in 2134 days


#3 posted 01-21-2012 07:10 PM

cool, thanks for clarifying

-- There are many ways to skin a cat...... but, the butter knife is not recommended

View DIYaholic's profile

DIYaholic

14558 posts in 1422 days


#4 posted 01-21-2012 07:33 PM

Nice job documenting this whole project/process. Thanks for doing so!

FYI: To test for leakage through any blast gate, one could use “smoke” from a cigarette, or take a cloth bag filled with powder (flour, talc), tap to release the powder and see if the “smoke” is sucked into/around a closed blast gate.

If home made blast gates do leak, an O-Ring recessed inside the “Housing” around the pipe for the “gate” to seal up against, should help to stop/reduce leakage.

-- Randy-- I may not be good...but I am slow! If good things come to those who wait.... Why is procrastination a bad thing?

View Phil277's profile

Phil277

156 posts in 1070 days


#5 posted 01-21-2012 07:44 PM

Gates often jam small chips into the back of the slot when you close them. Eventually you can’t close the gate all of the way. Have you managed to find a good way to deal with this problem on your gates?

Phil

View ChunkyC's profile

ChunkyC

856 posts in 2001 days


#6 posted 01-21-2012 08:21 PM

Phil: Yeah, no back. As I said, they are “pass through” style blast gates.

I can say for absolute certainty now that the gates are in fact getting sucked up into the body and sealing themselves. If I had a video camera that would take at least half way decent vids, I’d take one of the gate getting “sucked up” tight against the body. You can actually see it happening.

c

-- Chunk's Workshop pictures: http://spadfest.rcspads.com/thumbnails.php?album=135

View Gadgitron's profile

Gadgitron

4 posts in 1064 days


#7 posted 01-22-2012 03:28 AM

well documented thank you.

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