Gene, how about drilling those holes, if you don't need more resolution than that. Even simpler: punch them with a paper (document) punch (don't know what the term in english is) in a straight piece of sheet metal.
Peter gene heskett schrieb: > 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 > ------------------------------------------------------------------------------ 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
