Reply by Mr Jones

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Posted on Disappointed with my Onieda Super Dust deputy

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Mr Jones

13 posts in 3043 days

#1 posted 06-27-2018 01:41 AM

I run a SDD with a 1 1/2HP blower. Its exhausted out side maybe that s the diff but it works just fine.

I would replace all that flex with rigid ducts. You can use a 5×6 reducer to transition to duct work.

- rwe2156

I can simply exhaust the material outside and get the similar results, but i want the exhaust air going into a filter.
With the 3hp blower, there’s more than sufficient suction power and while i can replace the flex to obtain more cmf that isn’t exactly solving my separation issue right?

I ve always been surprised when people get those small cyclones to work right. I have a Tempest cyclone that Penn State used to sell. It looks huge compared to a portable cyclone. I get phenomenal separation with no chips or dust reaching the filter. When I check the cleanout in the pleased filter, it looks like it needs to be dusted with a Swiffer. That s it.

Once you figure out how to improve separation, switching to hard piping will be the next step. Having that much flex pipe will destroy your useable suction. It makes a huge difference.

Good luck with your DC issue.

- pintodeluxe

The Penn State Cyclone seems to be proportionally sized. It looks closer to the tall and narrow pentz design! I remember when it was on sale – price was very decent.

The connection between the bottom end of the cone and the collection barrel has to be absolutely air tight. Any leak there will suck in air and prevent the chips from falling under the force of gravity. I suspect that is where your problem is.

With your setup, you have at least three connections to seal.
1) The rim of the barrel to the lid.
2) Your down hose to the port in the lid of the barrel.
3) The SDD to the down hose.

There has to be no air at all being sucked into the bottom of the cyclone or it won t work.

For a test, try putting some suds all over those connections and see if it s getting sucked into the joint.

Disclaimer : I say all that from stuff I read. My SDD is not installed yet.


Rim at the barrel is air tight – It’s a Food grade metal drum with a silicon gasket and a locking clamp
The rest have been checked for leaks and I’ve sealed everything with layers of hvac tape. But I will could check again

- Ocelot

So what does this mean? Others have suggested you need some back pressure. Why? That will force the system to a lower flow rate since the blower curve goes from lower flow and higher differential pressure to higher flow and low differential pressure. Why does this matter? Low differential pressure and high flow means higher velocity which means more of the dust is being held up in the airstream rather than hitting the walls of the cyclone and falling out. It s all about dissipating energy and slowing the particles down in the cyclone so they fall out of the air stream.

- EarlS

I’ll add the filters Shipwright suggested and see how it holds up.

I run a SDD with a 1 1/2HP blower. Its exhausted out side maybe that s the diff but it works just fine.

I would replace all that flex with rigid ducts. You can use a 5×6 reducer to transition to duct work.

- rwe2156

Same here.
No issues to date.
Here is what I did.

- fivecodys

I read your post. I’d like to avoid the expensive 5” metal ducting from Onieda.
It seems your also venting outside which is an option for me, but i know I’d upset my neighbor’s with the exhaust noise haha!

I honestly feel the problem with this Model of Dust deputy is the 5” inlet. It makes finding anything but flex piping difficult or expensive. I tried finding 5” S&D pipe with no luck (I haven’t found a distributor in Ontario) so i resorted to flex. I could always step up to 6” but that doesn’t make sense when the inlet is 5”

I honestly believe this is why the new model comes with a 6” outlet and 6” inlet and it taller. It must work words better in separation…

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