Originally Posted by lakeside Program a 4 flute carbide end mill to break case harding in one quick pass on Y and the go to spot drill. What size hole are you drill? |
i agree , but peck drill it dry with a light peck and feed , similar to what you would do to burn out a broken tap
use some older burned out carb endmills ,stubbier the better, regrind them as needed
then it won t hurt the pocket book so much ,