8 inch downdrop for lathe/large downdraft sanding table

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Forum topic by secretgarden posted 11-05-2014 11:14 AM 738 views 0 times favorited 3 replies Add to Favorites Watch
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18 posts in 1016 days

11-05-2014 11:14 AM

I have a 3 hp Oneida 2005 Super Dust gorilla (appx1700 cfm) attached to all 6 inch PVC duct. I was thinking since this cyclone has an 8 inch intake and I have the space and my lathe/downdraft sanding table are within 10 linear feet of the cyclone, why not run an 8 inch duct to the lathe/sanding table area. The cost is less than $30 plus the bandaids used on the cuts to my hands working with the metal duct, What do you all think? I have the space, supplies, and some down time in the woodshed and the mating of the PVC/metal duct is no problem.

3 replies so far

View pmayer's profile


848 posts in 2486 days

#1 posted 11-05-2014 02:04 PM

I would think that this would be fine but I would run it by Oneida to be sure. You need to be sure that you are maintaining adequate air speed in the line, as if you drop too low you will have problems. If you are able to maintain adequate air speed in a pipe that size, you should see some great dust collection results with that setup.

-- PaulMayer,

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9 posts in 1666 days

#2 posted 11-05-2014 03:11 PM

Another consideration is the number of ducts hooked up at the same time. Air, like water, will follow the path of least resistance. The 8” duct being very close to the collector will reduce the flow from any other ducting immensely. If everything else is OK and you have adequate flow then the addition of a valve or damper of some kind will allow you to use everything else you have connected.

-- Ken, Red Hill, New Mexico

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2393 posts in 2304 days

#3 posted 11-05-2014 03:46 PM

Typically to go with 8” duct and not lose a ton of airspeed you’d need an impeller of at least 16”; the Oneida website doesn’t list the impeller size, but I’m guessing it is 14” based on what most other 3hp cyclones use.

-- Sometimes the creative process requires foul language. -- Charles Neil

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