These gates are “through gates” meaning that the back is completely open. One down side to making gates like this is that there isn’t a stop, the gate pulls all of the way out. I need to add a stop to at least one, for under the table saw, but so far I’m ok with the gates pulling out. I just turn it and stick the corner back in the slot. Works ok for me.
Blast gates are simple to make, or I supposed you could make it as difficult as you like. The hardest part I had was finding “fittings” that I could use to convert from 4” S&D to 4” DC hose and fittings. I think I have a solution that works for me.
Here’s the lasted blast gate “parts.” (Click for larger pictures)
I made some parts that could be assembled in multiple ways, sort of like “mix and match.” I need ways to connect to 4” S&D Pipe, 4” DC Hose and 4” DC fittings in all sorts of configurations. So I made a mix bag of parts to get me started. They are glued up with Poly Glue, I use yellow glue to glue them together.
The gates are made from 1/2” Birch Ply, 3/16 Hard Board for the gates and 1/4 HB for the “spacers” and some scrap hardwood for the handle; walnut in the case.
Far Left: Gates, handles and spacers.
Left: “Soup Can”: My 4” hose fits nicely over a large tin can. This tin can just so happens to be a large can of fruit cocktail to give you a sense of size.
Middle: 4” Plastic Coupling cut in two. This is a coupling that is made to connect two DC fittings together, not the one that used to connect two pieces of hose together.
Right” 4” S&D Pipe Coupling cut in two. The other half is on the first gate that I made.
Here’s the first one that I made assembled and installed:
I’ve since added a handle so that the gate wouldn’t fall through. I was really surprised by how well this thing seals. So much better than those cheap plastic gates that I have been using. Although, the 2-1/2” gates work quite well. I haven’t had any problems with them, yet. The 4 inch’ers total junk. Everyone I have leaks. Sounds like I have a shop full of whistling crickets in the shop when the DC is running. I’m not sure which is louder, the whistling gates or the DC.
-- Chunk's Workshop pictures: http://spadfest.rcspads.com/thumbnails.php?album=135