On Wednesday 13 February 2019 03:46:53 Les Newell wrote: > I recently made a couple of coolant units based on eBay mister heads > like this one > <https://www.ebay.com/itm/Mist-Coolant-Lubrication-System-Spray-for-8m >m-Air-Pipe-CNC-Lathe-Milling-Machine/172271983174?>. These ones with > the straight end on the nozzle seem to be better quality than the ones > with a nozzle that just tapers down to a blunt point. The problem with > all of these eBay misters is that they generate a fine mist, which > gets everywhere. I made some modifications on mine to work around the > problem. The air jet in the model I linked above is just over 2mm > diameter. I extended the oil jet using 2mm stainless tube so it now > sticks out about 1.5" past the end of the brass nozzle. This leaves a > thin annular gap for the air to get out. As the area of the air jet is > now very small you can run quite high pressure (60 - 100 psi) with > very low flow. By the time the air reaches the end of the oil jet it > has slowed down a lot and no longer has the energy to break the oil > into a fine mist. You end up with a column of air carrying a stream of > droplets in the middle. On alu oil consumption is minimal. I use a > neat cutting oil and my previous tank was the filter bowl on an air > regulator. That was enough for several days of machining. > > One down side of this setup is that it won't suck the coolant up from > the tank. I used a filter canister as my reservoir. Shop air is > supplied at full pressure to the nozzle through a solenoid valve. > There is a tee in the line which feeds a regulator to drop the > pressure to ~10 psi for the reservoir. Theoretically those filter > canisters can take 100psi but that sort of pressure in a plastic tank > scares me. > > By the way Gene, if you are buying a solenoid valve from eBay, get an > Airtac valve. They are available in a wide range of voltages and > configurations. They are reasonably well made and can handle 100% duty > cycle. > > Les
So I probably bought the wrong one. Expertise comes from the experience of doing it wrong. :) > > On 13/02/2019 01:31, Phillip Carter wrote: > > I use a water filter canister similar to this: > > https://www.cnczone.com/forums/uncategorised-metalworking-machines/1 > >02934-built-fog-less-coolant-mister.html > > <https://www.cnczone.com/forums/uncategorised-metalworking-machines/ > >102934-built-fog-less-coolant-mister.html> > > > > Cheers, Phill Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
