no clog blast gate

  • Advertise with us
Project by footprints posted 02-16-2010 09:39 PM 2803 views 2 times favorited 5 comments Add to Favorites Watch

Saw dust and chips often prevented complete closing of the cheap plastic blast gates I bought so I modified them. The two halves are induction welded and easy to get apart with a sharp putty knife. Drive it in from the same direction as the gate with light hammer taps to cut the welds.

Using your router fence and a 1/4” straight bit, drop one half over the bit and mill a slot through the plastic body – seen on the right side of photo one. Then just drill some holes for number 8 hardware or pop rivet the two halves back together. Now when you close the gate, it pushes the debris out the slot. The second photo has masking tape on the leading edge of the gate and the third photo shows how, when closed, the tape is visible through the slot.

I’ve been using these for about six months with no problems – EXCEPT for the one I stupidly installed with the slot pointing upward! Easily fixed and works great now.

-- Ray, Lakeland, FL

5 comments so far

View RandyMarine's profile


236 posts in 3333 days

#1 posted 02-16-2010 11:24 PM

Genius and pratical, please share your details.

-- Semper Fi, Randy Sr.

View charlton's profile


87 posts in 3372 days

#2 posted 02-17-2010 12:09 AM

Maybe I’m missing something here but doesn’t cutting the slot now mean that there’s an additional orifice for air to get into when the gate is opened (presumably reducing the air being sucked in downstream duct lines)?

View Dudley's profile


742 posts in 3224 days

#3 posted 02-17-2010 02:11 AM

My thoughts also Charlton. ????

-- Dudley Young USN Retired. Sebastian, Fl.

View footprints's profile


45 posts in 3072 days

#4 posted 02-17-2010 04:56 AM

The orifice is less than 1/8” wide by 4” long so not too much air leaks in. The air intrusion is minimal on my system. I can open three gates at once and still get good dust collection.

-- Ray, Lakeland, FL

View jockmike2's profile


10635 posts in 4210 days

#5 posted 02-17-2010 09:37 PM

A quick fix I could see would be to adhere a small thin plastic flap on the inside of the gap you create with a chunck of a piece of say a slice out of a bleach bottle. It would still let your blast gate push debris out but would stop any air lose. Just a thought.

-- (You just have to please the man in the Mirror) Mike from Michigan -

Have your say...

You must be signed in to post the comments.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics