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Reply by JBrow

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Posted on DIY Dust Cyclone Woes

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JBrow

1368 posts in 1770 days


#1 posted 08-29-2016 02:43 AM

TysonK,

In January 1994, ShopNotes Volume 3 Issue 13 published a how to build you own cyclone dust collector article. The article is short on theory, but provided enough detail that I was able to build this cyclone unit. It worked amazingly well. If you are interested in getting a copy of the magazine, it was published by Woodsmith, Des Moines, IA. You may be able to get it by ordering from Woodsmith on-line or maybe a local library would have this issue.

Here are some dimensions from the ShopNotes article that could be compared to your cyclone and which may be helpful. The cylinder has a diameter of 16” and a height of 20”. The large diameter of the funnel is 16” and the small diameter is 6”. The funnel is about 18” high. The end of the internal pipe in the center of the cylinder and leading to the impeller is positioned about 1” above the seam where the cylinder and the funnel meet. The center of the 4” inlet pipe spec’ed in ShopNotes was about 4” below the top of the cylinder.

Some areas that might improve separation, if they can be addressed, are…

In your diagram, the internal 6” pipe connected to the impeller is slightly below the transition of the cylinder to the funnel. This pipe may be a little too long. But if the end of the 6” internal pipe is not low enough (i.e. too short), debris my just get pulled directly into the internal pipe, as suggested by WhyMe. This may require extending the height of the cylinder and moving the inlet up.

You mentioned the interior of the cyclone body is coated to make it smooth. If the coating applied to the wood does not eliminate the inside corners of the staves then these corners could introduce turbulence near the walls of the cyclone body. This disruption of air flow along the walls of the cyclone may be enough to allow debris to enter the low pressure zone in the center of the cyclone body and enter the filter. At this point it is difficult to see a practical way to eliminate inside corners.

You made mention that the unit is sealed to prevent air leaks. However, your photo shows a piece of MDF setting atop of the white dust collection bin. If this joint to the dust bin is not sealed and air is being pulled into the dust collection bin at this joint, some loss in efficiency could result.


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