ClearVue CV1800 vs Felder AF22

**mwells** · 10th March 2021, 01:21 AM

Originally Posted by BobL

The problem with going short on the bin size is the bin should not be allowed to fill up close to the top otherwise this starts to compromise the separation ability of the cyclone. This happens well before it starts to spit out the chips. With a 22" drum I would be emptying at no more than about 18".

A friend of mine is an expert in air handling for cotton gins. Cotton gins use giant cyclones that exhaust outside and they are regulated by the PM2.5 emissions sent into the atmosphere. I had him come talk to our local woodworking club and the two things I learned were

1. If a cyclone is not separating correctly, it is usually because too little air is entering the cyclone.

2. The cyclone efficiency can be increased significantly by adding an "expansion chamber" at the bottom of the cone. Picture of what I'm talking about https://ars.els-cdn.com/content/imag...003009-gr1.jpg Here's a paper that gives the dimensions of the expansion chamber: https://www.researchgate.net/profile...otton-Gins.pdf See page 566.

When I look at our woodworking cyclones, it seems like the dust bin is similar to our expansion chamber, so it makes sense that if the dust bin is too full, separation would drop.

Mark

**Rushton** · 10th March 2021, 03:39 AM

Originally Posted by mwells

2. The cyclone efficiency can be increased significantly by adding an "expansion chamber" at the bottom of the cone. Picture of what I'm talking about https://ars.els-cdn.com/content/imag...003009-gr1.jpg Here's a paper that gives the dimensions of the expansion chamber: https://www.researchgate.net/profile...otton-Gins.pdf See page 566.

Very interesting, Mark. Related to this, and as shown in the diagram you shared, is the long length of the cyclone itself. As many will recall, Bill Pentz is a strong promoter of longer cyclone body length to improve separation. This longer body length creates that height challenge some of us have in our shops, but it certainly provides improved separation compared to the shorter, stubby cyclone bodies uses by some manufacturers. (Sorry if this a repeat of comments made long ago in this forum. I'm still reading through a lot of those past posts.)

**BobL** · 10th March 2021, 09:08 AM

Originally Posted by mwells

2. The cyclone efficiency can be increased significantly by adding an "expansion chamber" at the bottom of the cone. Picture of what I'm talking about https://ars.els-cdn.com/content/imag...003009-gr1.jpg Here's a paper that gives the dimensions of the expansion chamber: https://www.researchgate.net/profile...otton-Gins.pdf See page 566.

When I look at our woodworking cyclones, it seems like the dust bin is similar to our expansion chamber, so it makes sense that if the dust bin is too full, separation would drop.

That's exactly what I'm talking about.

Unfortunately for many DIYers this adds to the overall height of cyclone which already can be a limiting factor to installation.

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