Hi Guys; I just broke my last brand new 1/16th carbide end mill in about 15 minutes running time, a 4 flute with about 1/2" of working length, trying to get started on another alu encoder wheel, getting about 80% of the way around the outside, running at 2500 revs, and 1.5 ipm, cutting only .005" deep, running in a puddle of cutting oil.
Obviously the 4 flute is a no-no in soft alu as it was pushing alu ahead of itself for 90% of what it did cut which tells me it was half plugged after the first 1/2" of feed in that heavy duty (0.0037" thick) coors can alu . Filled up the flutes nearly instantly even if it was swimming in cutting oil. So, I need to find a more suitable mill for this, I assume only 1 or 2 flute, and maybe only 1/8" of working bit. Since I don't have a 10,000 rpm spindle, 2500 is it, what mill should I buy, and how fast can I feed it? Or am I doomed to go find some harder sheet alu that cuts cleaner and won't plug up a mill? Thanks. 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> A man usually falls in love with a woman who asks the kinds of questions he is able to answer. -- Ronald Colman ------------------------------------------------------------------------------ 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
