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Dust Collection #2: Blast Gate rough draft

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Blog entry by Holbs posted 137 days ago 674 reads 1 time favorited 5 comments Add to Favorites Watch
« Part 1: 6" HVAC duct supports Part 2 of Dust Collection series Part 3: how I make 6" HVAC blast gates »

I figured, it was best to construct a rough draft 6” blast gate while writing down measurements and keeping parts as templates for the next 10 or 12 blast gates I have to construct.
End result: a functional self cleaning blast gate. I do have to add stoppers before and after the body on the 1/8” hardboard (didnt add in the 1” clearance for that, on my first piece). But it does slide in and out with SOME friction still present (I did add duct tape on top of the hardboard when affixing everything).



5 comments so far

View dbhost's profile

dbhost

5378 posts in 1837 days


#1 posted 137 days ago

Interesting design. How do you keep the middle piece from coming out?

-- My workshop blog can be found at http://daves-workshop.blogspot.com

View Holbs's profile

Holbs

513 posts in 635 days


#2 posted 137 days ago

i’m unsure how much friction is suppose to be there, but there is enough to hold it in place open or closed. I’ve seen others that slide super smooth with magnets to hold things in place. Unsure if i’m doing it wrong or if doesnt matter. I am using 1/8” hardboard which is super smooth on one surface and highly rough on the opposite side.
and i will be adding beginning and end stops on the next models i fabricate

View scoobydooo9r's profile

scoobydooo9r

135 posts in 2381 days


#3 posted 136 days ago

You mentioned it was “self cleaning”, I’m not seeing what you mean by that. I may setup a real DC system in my shop one day, and I don’t want to miss out on something that may be good to know. Can you explain how the self cleaning part works? Thanks for sharing an update Holbs, the ducting is looking great so far!

-- I don't make mistakes, I make design challenges!

View Holbs's profile

Holbs

513 posts in 635 days


#4 posted 136 days ago

the “self cleaning” title thew me off too until I read the first generation of blast gates were simple pull up gate 4” to open and then push down same gate 4” to close, on a 4” duct which caused debris to accumulate inside the housing. a “self cleaning” pushes all the way thru, so your tab would be 8” effectively pushing debris out every time you engaged the gate.
first generation blast gate:

“self cleaning” blast gate is like mine.

View scoobydooo9r's profile

scoobydooo9r

135 posts in 2381 days


#5 posted 134 days ago

Ahh, that totally makes sense now! Thanks for showing me that, it will come in handy when I do a real DC install.

-- I don't make mistakes, I make design challenges!

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