On Tuesday, February 07, 2012 02:08:07 PM Peter Blodow did opine: > Gene, > you are probably using green glass fiber enforced epoxi board. For just > that reason I am using the good old brown Pertinax material (phenol > hardened resin paper board), whatever it may be named in the US. Normal > cheap HSS drills last forever unless they break. > > Peter Blodow Chuckle. :) I don't think there is any "probably" about it Peter, but its not green, but white, obviously a glass-epoxy panel from the way it frays with dull bits, with 1oz copper both sides. Its what I can get locally from the shack, and not all that pricey. Eats the edge off an 1/8" HSS drill bit in about a dozen halfway through the board holes. And 1/8" is almost too small to tune up with a drill doctor. 3/16 & up, great, best edge ever, but 1/8 tends to get off-center in the DD's chucking lashup.
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> It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something. -- Franklin D. Roosevelt ------------------------------------------------------------------------------ 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
