Re: [CAD_CAM_EDM_DRO] Any "Best Practice" Recommendations for clearing chips and feed/speed when

WRT Coanda air amplifiers, it shouldn't be too difficult, and though I know the
general look of one, I don't have any exact specs. Do a search of, "Coanda
Effect", and you should find a couple of sites, that go into several
applications, including rotorless hellicopters, and a search of, "air
amplifiers", should turn up several manufacturers. I think the one in Arizona
is the one that shows a cut away drawing. They're a little larger than a T
fitting for 1.5 inch or so plumbing pipe, and not much more complicated. Making
one would be an interesting project, but I doubt that they're much more than
$50-$100 bucks apiece. The basic units with slight variations are used for all
sorts of sucking/blowing/cooling/etc., applications.

Thermite is generally made with powder sized particles, but if a heap sits
around vibrating/oxidizing long enough, who knows?

Bill

On Sun Dec 23 09:40:31 2001, Smoke, <smoke@...> wrote:

>Very interesting! Got any info on how a hobbyist could build one of these
>"Coanda" systems?
>
>Thermite made from aluminum and steel chips....hmmmmm. That should raise
>some ideas!
>
>> You need a regular dust collection system, not a shop vac. One of the
>best, and
>> easiest to build is the vortex system, (see rec.crafts.woodworking
>archives).
>> It's the same thing with grain silos; Enough fine particulate matter plus
>> commutator/switch sparks equals instant explosion. There are several ways
>to
>> move the air into/from a dust collector, but you want a zero sparks
>solution.
>> One such solution would be to use an air amplifier. These work on the
>Coanda
>> Effect, which has to do with how gasses and liquids move across a curved
>> surface. Coanda was one of those multi-discipline geniuses who lived back
>> around the early part of the last century. His main gig was organic
>chemistry,
>> but he also designed, built, and flew, the first jet airplane. An air
>> amplifier is a three opening unit that acceptss air from a compressor, and
>uses
>> it to induce an airflow into one side, and out the other. The specs I've
>seen
>> indicate that it works on a 1:25 ratio; I.e., a 10 mph flow from the
>> compressor equals a 250 mph flow through the device. This spec is the
>same
>> from several manufacturers, so I presume this is the max for practical air
>> moving devices, though no doubt the figures and sizes are different for
>denser
>> stuff like liquids.
>>
>> While I'm on the subject, try to segregate as much as possible the results
>of
>> your aluminum work from your ferrous metal work. Rust, (ferrous oxide),
>mixed
>> with aluminum oxide equals thermite, which burns, (redox reaction), in the
>> neighborhood of 5 or 6 thousand degrees, and has been known to self
>ignite.....
>>
>> Bill

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