On Monday, February 13, 2012 08:59:31 PM dave did opine: > On Mon, 13 Feb 2012 22:09:47 +0200 > > Roland Jollivet <[email protected]> wrote: > > On 13 February 2012 21:38, gene heskett <[email protected]> wrote: > > > On Monday, February 13, 2012 02:24:49 PM Roland Jollivet did opine: > > > > ..snip > > > > > > > > I would imagine... that the oxide layer is way way thinner than a > > > > micron in thickness, and while tough as you say, in climb milling > > > > the cutter tip will hit the metal and with the eggshell effect, > > > > simply push past the oxide layer. > > > ><snip> > > Taken directly from the OSG 2-3 flute carbide end mill section. > > dia rpm feed (ipm) > .015 100000 7.1 > .020 62000 7.9 > 0.03 40000 7.9 > 0.0625 21200 7.9 > 5/64 16000 11.8 > > depth > < 1/32 .25D > 1/32 -> 5/64 0.5D > > scaling those spindle speeds gives more like .8 ipm and 0.03" > depth/pass. > So that is saying that my 1.5 ipm @ 2500 revs was still too fast by a factor of 2?
Hummmmm. Next one will be brass, I got a small sheet at the hobby stop for $8 today, then stopped at ACE to see if they had any more info on that cutting oil they sell (no) and stumbled over a 8x34" sheet of solid brass kick plate about .032 thick for a $30 bill, so both came home with me. > FWIW: Boeing uses copious amounts of emulsifiable oil in > cutting Al. Think fire hose type flows for a wing spar. I've seen videos of such. Zero chance of a recut. :) > I did find a Russian video using alcohol for cooling. However, > if it flashes then you're toast. Alcohol also burns with a > almost colorless flame. And even with CO2 extinguishers, damned hard to put out, we had to hit a fuel burning dragster 3 times one afternoon in the pits at Cordova IL during an ATAA nationals meet in the late '50's. In bright sunlight, your only clue is a fuel line looking like a large diameter piece of dynamite fuse, bubbling and boiling along without noticeable smoke. Spooky. We used up 3 CO2 extinguishers in about half an hour before it was put out for good. They had a 160mph machine but couldn't get it back to the tree in time for the next heat, so Koch & Bedwell's machine got that heat by default. Then Don Garlits took the next round by 2 or 3 feet at the traps. > Looking at heat of vaporization: > > material J/g > > water 2257 > methanol 1100 > ethanol 846 > propanol 779 > > Of course you have to boil it off to get that removal of heat. > Ventilation for the organics would be more than just advisable. > > It looks much safer to stay with emulsifiable oil. > > Keep kicking at it, you'll get there. > > Dave > > > ---------------------------------------------------------------------- > > -------- Try before you buy = See our experts in action! > > The most comprehensive online learning library for Microsoft > > developers is just $99.99! Visual Studio, SharePoint, SQL - plus > > HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when > > you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 > > _______________________________________________ > > Emc-users mailing list > > [email protected] > > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------ > ------ Try before you buy = See our experts in action! > The most comprehensive online learning library for Microsoft developers > is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, > Metro Style Apps, more. Free future releases when you subscribe now! > http://p.sf.net/sfu/learndevnow-dev2 > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> And if you wonder, What I am doing, As I am heading for the sink. I am spitting out all the bitterness, Along with half of my last drink. ------------------------------------------------------------------------------ Keep Your Developer Skills Current with LearnDevNow! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-d2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
