Quote Originally Posted by cropwell View Post
Their finest holes were much smaller than a human hair and they were using carbide drills on a 1/8 shank.
Yes, these were ground into 4" long 1/8 shank carbide blanks and there most commonly used size was 0.1mm. I could have sat and watched the grinding machine all day it was amazing. Don't think I could have touched the endmills without breaking one so how the hell they get a machine to do it blows my mind.!