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Blast gate problems

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Review by bear2 posted 03-10-2013 08:05 PM 1590 views 1 time favorited 8 comments Add to Favorites Watch
Blast gate problems No-picture-s No-picture-s Click the pictures to enlarge them

I recently purchased two 2 ½ inch blast gates from Rockler so that I could split my tablesaw from my floor vacuum. After installation I found that with one gate opened and one gate closed my vacuuming power was reduced by more than half. The gates leaked significantly in either the closed or opened position and rendered the system useless.
For a small system the small gates are of little value, for a larger more powerful system larger gates may work.

-- It isn't always about being fast or even accurate that counts, it's being willing




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bear2

12 posts in 1834 days



8 comments so far

View TechRedneck's profile

TechRedneck

738 posts in 1515 days


#1 posted 03-10-2013 08:54 PM

Did you have the gates installed correctly?

The tab on the gate should point or bend in the direction of the flow.

-- Mike.... West Virginia. "Man is a tool using animal. Without tools he is nothing, with tools he is all.". T Carlyle

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Craftsman on the lake

2386 posts in 2095 days


#2 posted 03-10-2013 08:55 PM

I’ve got 7 of these gates in my 1 hp delta system. I haven’t found them leaky at al. In fact with them all closed the hose crinkles up and tries to suck itself into the collector. I don’t know what the issue may be with yours. Did you notice the little dimple at the top edge of the gate? The gate needs to be closed so that the dimple snaps into place otherwise it’s not closed completely. Dunno if this helps or not.

-- The smell of wood, coffee in the cup, the wife let's me do my thing, the lake is peaceful.

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woodbutcherbynight

1271 posts in 1067 days


#3 posted 03-10-2013 11:39 PM

what is the size of the hose on the floor vacumm you are using?

-- Live to tell the stories, they sound better that way.

View bear2's profile

bear2

12 posts in 1834 days


#4 posted 03-11-2013 12:32 AM

I initially installed the gates with the bend in the direction of flow and aluminum taped all joints. That did not work. I tried installing them in the other direction, that did not work.
I do not know how anyone else’s work but mind don’t.
I would like to thank everyone for their import.

-- It isn't always about being fast or even accurate that counts, it's being willing

View LoydMoore's profile

LoydMoore

96 posts in 614 days


#5 posted 03-11-2013 01:30 AM

I have gates all over the shop that are made from MDF with 1/4 ply gates. They all leak but do not have a measurable impact on either system’s suction.

-- Loyd, San Angelo, TX http:www.moorewoodenboxes.com

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woodbutcherbynight

1271 posts in 1067 days


#6 posted 03-11-2013 01:56 AM

Could it be you have a restriction in one of the tubes? My son and daughter call themselves helping dear old dad and “clean” the shop with a 20’ hose with a wand. When they left and I went back to the shop it had little suction. Seems they discovered Army men can fit inside, thus a blockage.

-- Live to tell the stories, they sound better that way.

View kajunkraft's profile

kajunkraft

98 posts in 868 days


#7 posted 03-12-2013 02:35 AM

I never thought about the gate being in line in a certain way. How does that matter? When the sliding part is pushed all the way in, it’s in?

View TechRedneck's profile

TechRedneck

738 posts in 1515 days


#8 posted 03-12-2013 02:51 AM

kajunkraft

If you look at the picture that Bear posted at the top, you will see that there is a screw knob that locks the gate in place and/or provides a bit of friction so it won’t rattle.

This screw pushes the gate against the up draft side and leaves a gap at the bottom. You want that gap on the tool side so when the gate is closed and suction applied the sliding gate seals. If you install them the other way, air escapes through the gaps in the blast gate.

Now, one or two gates in the wrong way may not make a lot of difference but if you have five or six then it does. All gates leak a small bit. I know that I have (on more than one occasion) turned on my CV Mini cyclone with all the gates closed and it immediately started to suck in the sides of the 25 gallon metal trash can.

-- Mike.... West Virginia. "Man is a tool using animal. Without tools he is nothing, with tools he is all.". T Carlyle

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