On Wednesday 13 February 2019 09:33:08 jrmitchellj wrote: > 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!
I saw that impending disaster while making the panel for the go704's new interface, stopped and cleaned out the cutter before I resumed. 4 or 5 times. I got a usable panel, nearly burnt my hands on it, and held the 120 psi air hose on it to finish the dsub connectors, last in the program. For the next one, I'll have the air, and a 8oz spray bottle of water handy. Being what one could call "out in the puckerbrush" here in WV, it will be a week or more before any of the other stuff arrives, so I've commented out the 5 minute cooling delays, and changed the code as I talked about and you clipped so there are no more descending ramps in it. But if I actually cut alu, I'll have a finger on the esc key in case I start to see color from alu pileup in the tool. In fact, I've bought a 5000 lumem led stick lamp from Wallies, to hang on the bottom of the 2x4' shelf the computer and drivers are mounted on, about 30" above the gantry bed, so I'll get that un-boxed and installed so I can see better. > 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. That implies pure water, as in distilled. I have that in gallon jugs because of the wifes oxygen reducer uses about a pint a day. It's also what I have in the motors coolant tank. About 3 gallons ATM. Thanks J. R. > > --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-fo > > >r-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-machin > > > >es/1 02934-built-fog-less-coolant-mister.html > > > > <https://www.cnczone.com/forums/uncategorised-metalworking-machi > > > >nes/ 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 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
