Just an update on the testing for this drill. To refresh memories, I'm pasting the original post. /original Application: 12%Si forged aluminum alloy. 25 mm hole depth, 19.9 mm hole diameter, one-shot no peck, no pilot hole. Machine: 2007 Brother S2C, 240 PSI CTS Current Machining parameters: 3100 RPM, 1010 mm/min (37.79"/min) Feed. As of yesterday, 4100+ holes on the first head. By today, it should exceed
8000, provided nothing odd happened. Very good looking hole, straight, clean, almost looks reamed. Very pleased with this Iscar product so far. /end postNow with more than 24,000 holes on the original drill tip, it still looks great, holes are still on size and smooth. The only knock is that they don't have the larger heads listed in the catalog actually available.