Great Idea. Good thinking. I would also think that the increased velocity of the air near the corners just before the gate closes helps to really suck out the corners. Intresting question: Does the gate push the sawdust out or does the vacuum system suck it up. (of course that assumes you are opening and closing the gate when the system is running) The drill hole method would probably function similarly. I'm designing 6" gates for my dust collection system and will incorporate your idea. I like it better than a tape flapper valve with an open slot for the gate to clear out the sawdust. Good Job Dude! take an extra portion of dessert.
Regarding bubbles in epoxy filler. We use 2 part epoxy to seal some assemblies building rockets. Our process puts the mixed sealant in a vacuum for 10 to 20 minutes and the air bubbles come right out. Of course this requires you to have a vacuum set up and the epoxy has to have a long enough set up time to allow the bubbles to migrate to the surface and still be workable.
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