Reply by fussy

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Posted on Building a Dust Collector Cabinet

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980 posts in 3073 days

#1 posted 03-23-2012 07:07 AM

I think it’s a waste of time. The zig-zag air path would cut your suction to nearly zero. Every 90 bend has a drastic effect on cfm even if it’s smooth. I count eight hard 90 turns. Restricting the output has the same effect as restricting the input. You don’t want sound absorbant material in the air path at all as this would slow air flow drastically. You have to keep it moving to be effective.

You’re right that most of the sound comes from the motor and inpeller. The second greatest source is the exhaust, but your big filter acts as a big muffler. Your biggest problem is therefor the motor and impeller. Enclose them and only them in a box designed to fit of 3/4”ply lined top, bottom and sides (inside) with cheap acoustic tiles glued on. The ends need to have sufficient openings to allow cooling air for the motor to pass. You’ll get a little sound from here, but your goal is noise reduction, not total elimination. Make the intake and exhaust slots for the motor portion of the box with multiple curves at angles (like 25*down or up to direct that portion of the noise away from you.

The Thein separator is a very good idea. I put mine in the collector ring of my HF dc and in two years have gotten only 2 or 3 cups of dust out of my Wynn 35A filter.You will find it to be very efficient, but you have to be diligent and build it to fit accurately. The size of the drop slot and the proximity of the edges to the inner edge of the ring are critical. Still, it’s only a 1-2 hour build if you’re slow.

Good luck, and let us know how you’re doing.


-- Steve in KY. 44 years so far with my lovely bride. Think I'll keep her.

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