Gene, -snip-
On 10/09/2016 12:59 PM, Gene Heskett wrote: > On Sunday 09 October 2016 12:07:47 MC Cason wrote: > >> If you still intend to use positive pressure, an aquarium pump with >> a small check valve, would be a easier, cheaper, and quieter, >> alternative to a tire air compressor. It would also use an ordinary >> wall plug, instead of using more power off of your power supply. > > I have one of those, but its intended to pump the water, noisy as can be > dry, dead silent when wet. I use it as the coil cooling pump for one of > those $40 1kw Chinese induction heaters. > > But you're correct in its being the best solution, so I'll see if I can > find one of those, the smaller the better. Just leave it run when the > machine is powered up, with a painting dessicant filter followed by a > small engine fuel filter, fed into the confines of the screw I am > sealing up. > > I must be getting old, I didn't think of that at all. Oh wait, I just > turned 82 so I guess I am "old". :) Feed the pump an occasional drop of lubricant. it will quieten it down for a bit, and it won't hurt the ballscrew any. > >> Using silica gel would work, but it goes back to maintenance. you >> would be maintaining it from now on. > Thats easy, stick it in the microwave when it turns pink. And even when > its starting to turn colors, the air passing by will still be drier than > room air. That should reduce the dew point well below ambinet because > the garage is well insulated and heated/air conditioned. I keep it t > shirt comfy all the time. > >> There is no guarantee on how >> much moisture that gets remove form the airstream. The percentage of >> water that gets adsorbed is dependent on how much surface area that is >> available to the incoming air stream, and the volume of air passed >> over it. The systems I'm familiar with, used large flat pans to >> adsorb the moisture. After it adsorbed a certain percentage of >> moisture, the desiccant was replaced, and recycled by heating for a >> couple of hours. You don't want the desiccant to become filled with >> moisture, because it's efficiency goes down, as the level of water >> adsorbed goes up. Yours turning pink when saturated, means that it is >> doped with cobalt chloride. This makes it easier to tell when it >> needs regeneration, but makes it a bit toxic to work with. > I wasn't aware of that, and have been drying the stuff in the stations > microwave for decades. And of course I rinsing the dust out of a big > glass bowl before I put it back in the cupboard to hold tater salad at > the next station holiday doings. Enough for 40-50 people. > > Whats this toxicity do to humans? From what I remember, cobalt chloride is a carcinogen, as well as a skin/lung irritant. Being a mechanic, and not a scientist, I would say that it is no worse than anything else we are exposed to on a daily basis (car exhaust, factory emissions, product outgassing, shop chemicals, etc...). but it's still in my "be aware" category. Airborne, silica dust can cause silicosis, which is almost as bad as asbestosis. This is the reason why sand is no longer used in sandblasting. > >> I'm familiar with dry nitrogen systems, and it would be ideal, but >> impractical. Even with a 300CF tank, you would be replacing it every >> couple of weeks or so. For dry nitrogen, 4-9's, or 5-9's pure >> nitrogen will cost significantly more than ordinary 3-9's gas, which >> can still be a bit wet. I have always wondered about the possibility >> of hacking a medical oxygen generator to collect the nitrogen and C02 >> that it normally throws away. But, even that would need additional >> conditioning to remove the water, and increase it's purity. Before I >> became disabled, the last place I worked, we used 2 rail cars of >> compressed nitrogen weekly. Not an insignificant cost. Many years >> ago, when I worked in Silicon Valley, the nitrogen we used was brought >> into the buildings via a 6" pipe, connected to the pipeline under the >> street. The infrastructure used was similar to the way that natural >> gas is delivered. > Interesting, thanks for sharing. > > Thanks MC Cason. > > Cheers, Gene Heskett -- MC Cason Eagle3D - Created by Matthias Weißer github.com/mcason/Eagle3D ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
