Efficiency can be greatly increased by minimizing target size, i. The second row indicates the CFM loss for every foot of pipe. There are different processes for collecting the dust in a cyclone dust extraction method stream see global overview hereamong them, cyclones are probably one of the most widespread solution, in any industry. This is inevitable — more power always means more noise. Researching how cyclonic dust extractors worked and realizing that there is essentially only one method to extract cyclone dust extraction method from air without a mechanical filter.

A lot of material was sticking to the edges. I fixed this with some aluminium foil stuck to the inside of the cone on one side, grounded. For the earth connection on the foil, I stuck a piece of wire underneath it and glued it down. To make the glue, I ground the edge off a piece of mild steel magnet under grinding wheel to catch the filings , mixed with epoxy, and then used a magnet when in place to make the filings align and create an earth connection.

Not my idea alas, I cannot take the credit! I also used this glue to connect multiple pieces of alu foil together, although just grounding one side of the cone pretty much sorted it. However, this process was a bit long winded, and I understand aluminium tape should also work. A side note, some plastics will not hold static electricity - see the Oneida cone above, designed to be anti-static.

For my design, I wanted a super quiet extractor. I liked the idea of the Dust Sniper , which is essentially a couple of vacuum cleaners in a sound proofed cabinet drawing through two dust cyclones. Vacuum cleaners have a number of design considerations weight, movability, size that dont come into play with stationary workshop extractors.

Of course, just slapping a cyclone on the front end of a vaccum cleaner is by far the easiest for most people unless you have specific needs as I did.

In my case, I needed more extraction than a single vacuum could provide, I wanted to be able to draw from the same inlet not a good idea to use two different vacuums in parallel like this, as we shall see , and I wanted it to be super quiet. Note to US readers - you might have to shop around to find a good unit that plays nicely with V. Looking on Alibaba there are a few that are rated for both V and V, but with reduced power at the lower voltage.

My suspicion is that most the cheap motors you can find online that are rated to V will run on V, but with lower power - however, Cyclone Dust Extraction 8th you will need do you own research if you want to try this! Larger impellers will be the reverse - relatively low pressure, high flow.

Still, I went down this route to begin with. Firstly because I wanted to push my air through a few different stages including a HEPA filter, which I assumed typically have a fairly large pressure drop over them, and secondly because of sourcing. To buy a good sized impeller which was up to the task didn't look easy or cheap. On the other hand, when I checked youtube for vids of people making them - well, it just looked like a total ball ache. So I whacked two vacuum cleaner motors in parallel, and used an AC Motor Speed Controller amazon affiliate link to alter the flow rate.

In retrospect, I wish I had taken the time. Although the vacuum cleaners work, they are massive energy hogs, drawing lots of power to produce huge peak pressures which are kinda unnecessary for me. I measure, when both motors are running at full power, Cyclone Dust Extraction Zone about 3. Although this has a peak output of w it moves huge amounts of air - see thingiverse file and video below.

This setup also means I can run the vacuum motors at only 1. By the way, I could probably print these on demand, not sure price, get in touch if you are interested UK based but international shipping probably possible. A note though, I am told that running more than one motor can be a bit dodgy, especially if your ducting is not wide enough or if you use two differently sized motors in parallel.

Restrict the flow for too long, and your motors will be pulling against too much pressure, overheat, and burn down your house. Use motors that are not the same in parallel, and one will get all that nice cooling air juice, while the other will be restricted, sit there in relatively static air, and explode or again, burn down your house.

In other words, don't sue me if you screw up and die. That said, I'm now happy with the power of my setup in terms of suction, and comfortable it is not going to kill me. Those dimensions, or rather proportions, constitute the basis of most of the design across the industry.

It is recommended to keep those standard configurations, or some adaptation by reputable suppliers, and not modify it. Specific design can still be developed for specific high value applications FCC for example but it goes beyond the methodology presented here, requiring modelization, pilot trials The table below is due to Koch and Licht and is summarizing the work of different authors Lapple, Stairmand Table 1 : Standard cyclone geometries for a tangential inlet.

All the dimensions of the cyclones are related to the diameter Dc. A standard geometry is then selected and the diameter Dc is adjusted to get the desired performance. Figure 1 : Cyclone drawing and nomenclature of characteristic geometry. This design guide is based on the works published by Bohnet in For different types of inlet or higher dust loads, some corrections are necessary.

If you design a new cyclone, chose one of the standard geometry in table 1 and assume a diameter Dc. If you test an existing cyclone, determine the different ratios for the actual equipment you are evaluating. The efficiencies are calculated relatively to the cut off diameter. Bigger particles will lead better efficiencies. Smaller particles to lower efficiencies. A simplified version of the calculation tool can be found here - a more complete tool will be developped soon.

The air is diverted by the helix-shaped baffle, and it moves against the interior walls of the cyclone housing. The cyclone is wider at the top, and tapers down to the bottom, in an inverted cone shape. Heavier dust is carried by centrifugal force to the bottom of the unit, where it drops into a collection area. Clean air is carried through an inner cylinder to an outlet valve, where it is expelled to a secondary dust collector unit, or to the outside air.

Generally, cyclone dust collectors are used in facilities with high dust load, or high temperature applications. Cyclone dust collectors filter out coarse particles, larger than 10 microns in diameter. The filtered air is usually sent to a second-stage collector for further filtration or expelled through an air outlet. Because cyclonic collectors use a mechanical separator and centrifugal force, there is little maintenance required to keep them operational.

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