Reply by bbasiaga

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Posted on On a Dust Collector what about placing impeller before cyclone?

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1259 posts in 3242 days

#1 posted 06-28-2015 11:36 PM

The pressure drop of the Wynn filters is reported to be less than that of the original bag filter. So by replacing that bag you have pushed your fan farther out on the curve. Some think too far, meaning it will move more air than the motor is rated for, lowering the motor life. I have not tested either of these things myself as the fan curves (if they even exist) are not widely published.

Still, a common recommendation is to put a blast gate somewhere in the system and trim back the air flow to within spec for the machine. i have done that. The cyclone is a low pressure drop device, but it could serve some of that same purpose. I also put the Woodcraft version of the garabage can lid Thiene baffle before the blower. The motor runs without overheating, and i get reasonable dust collection. My portable contractor type TS is open in a lot of places, as is my Kreg benchtop router table. Collection is not good from either.

It works great from my jointer and planer, and has a noticeable impact on the bandsaw (which I thought was going to be the worst one but it is not).

Cyclones are relatively low pressure drop devices. And depending on how the fan is designed it may not matter much from a performance standpoint if it is in front of or behind the impeller. So In your shoes i would try it where it will protect the impeller and see if you get satisfactory results. If you dont like it, try it after the impeller and see if there is any difference. it would be a good experiment. You could further benchmark back to a system without the cyclone and see if that makes any differene.

But you’ll have options either way.

-- Part of engineering is to know when to put your calculator down and pick up your tools.

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