On Tuesday, February 14, 2012 07:18:09 AM Peter Blodow did opine: > gene heskett schrieb: > > Guy's, maybe I don't understand cutting alu as well as I thought. > > > > Cheers, Gene > > Gene, just don't make so much fuss of the oxidizing bit. Run the machine > at its highest revs (al least with these small cutters), don't think > about it, take as big a chip as the machine and workpiece suspension > will take, and happily mill away! There are zillions of mills and lathes > out there where nobody thinks about oxidation. I used to have (retired > now) a medium size Deckel-Gildemeister milling center in my company's > work shop which produced a lot of alu workpieces, adjusting its speed of > rotation automatically to the bit size. Small cutters like yours usually > run at 16000 to 25000 rpm there. > > Climb milling is preferable if the backlash of your screw will permit > it. Blades will always cut into fresh material, less friction, less > heat. With small cutters, you may compensate for backlash with a fairly > large retaining spring. > > Making tiny chips enlarges the alu surface and promotes oxidation, if > that is your fear. So, make large chips instead.
That seems to be the consensus. > If I were you (it's about as cold in mine as in your shop) I would make > myself a nice encoder pattern on foil with my laser printer and etch the > thing out of thin copper or hard brass sheet in my warm kitchen. By the > way, I bought three encoders, 512 lines, for 10 Euros at ebay last year, > marked as defective. Two were ok, the third needs some attention. Those would need more cpu power I think. This one has 45 holes, giving 2 degree resolution which should be more than 'good enough' for a 1st pass at a 7x12 lathe, which can turn 2500 revs, but never has when the tool was cutting. Lack of ponies is a very real problem with those. > Best regards > > Peter Blodow > 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> Once it hits the fan, the only rational choice is to sweep it up, package it, and sell it as fertilizer. ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
