Single vs Dual cyclone dust collector

**BarryBurgess** · 9th March 2005, 04:01 AM

I have built a single cyclone using Sturdee(Peters) design and using a 12" funnel cut down. It works well but on reading Turbulance (Paul) dual design I have started to build one and should complete in the next few days. I am using the same collection bin but mounting each to a different lid so that i can test which works better using two different strength vacuums.
I was just checking if anybody had already done it?

**Bob Willson** · 9th March 2005, 05:00 AM

Yes, I made the Turbulance one and it sucks big time.

**BarryBurgess** · 16th March 2005, 04:38 AM

Could any member susgest a method of comparing the effectiveness of the single and dual cyclone?
I want to do some testing over easter.

**Kris.Parker1** · 16th March 2005, 03:57 PM

Simple, place a bit of stiff plastic (like an icecream container lid) over each lid (not attached to the collecter) and see which one pulls in more plastic. Make sure the plastic isn't too stiff so you can't see whether it is bending or not.

Alternatively, shoot some saw dust through each one and test it that way... Hope that's of some help for you.

Cheers

Kris

**mic-d** · 17th March 2005, 06:51 PM

The industry standard used to be the 10lb bowling ball, but I see now you should use a vacuum chamber connected to a load bearing platform, on which rests the SI unit for vacuum, the house brick

(I hope you have Godfrey's where you are or that will make no sense at all!)
All I know I've read from the dust research pages, but to do it accurately I guess you would need a gauge that measures air velocity and/or air volume/time. I think a pressure (vacuum) measurement doesn't necessarily correlate well with dust extraction efficiency. I used to use high vacuum pumps that would pump down to less than 0.1mmHg, but they wouldn't move much air.
Cheers
Michael

**BarryBurgess** · 24th March 2005, 01:22 AM

I created half a dust bucket full of MDF sawdust and tested the ability to empty the bucket using the unmodified bucket(27seconds) the single cyclone(24sec) and the dual (28 sec)
I was using a 600watt vacuum. There was very little difference going to a 1200W vacuum.
The main problem with the dual(it might be that it requires a stronger vacuum) is the number of times it blocks up. With MDF the 1 litre jar is filled with too much fine dust. More dust also ends up in the vacuum
I cannot see what is going on in the dual but Peters design works very very well.
I am going to create some shavings from the planner to further test the two.
Normally at this point I would have ditched the dual cyclone but seeing I spent time & money on making it I will continue.
I hope somebody can come up with more ideas??

**Stuart** · 1st April 2005, 07:58 AM

Why not connect the intakes of each together and see which one sucks the crap out of the other first (or at least starts spinning the other motor backwards!)

Oh, and if anyone takes this post seriously then you deserve what you get!

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