Best way to use High Performance Carbide Drills
2015-1-31 · I like that steel rod idea. I use carbide drills pretty often. Never spade drills though, and neve that hard of a material. That being said, here is my advice, some of wich has been stated before: dont let it rub, be very careful when you break through, run maybe 300rpm, not 2700. The material is very hard, youll burn the drill right up at high speed.
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