With that thin of a chip it is doing more "rubbing" than "cutting", and with a lot of heat in the chip, it is likely going to start friction welding the chips to the cutter. Things can go downhill very fast, and a broken cutter will result!
With the cooling rig that I have, the part often comes off the mill cooler than when it went on. I keep the mist quantity very low, so the air moving it evaporates it quickly. --J. Ray Mitchell Jr. jrmitche...@gmail.com (818)324-7573 "No problem can be solved from the same level of consciousness that created it"Albert Einstein On Wed, Feb 13, 2019 at 2:44 AM Gene Heskett <ghesk...@shentel.net> wrote: > 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 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
