How To: Sharpen twist drills

[Jonathan Moore]

Or, when you start out in your engineering life you ask your boss to do it for you and eventually he gets so peed off, he hands you a new long series 5/8" drill bit which he has ground flat and after showing you how to grind it correctly he grinds it flat again, then its your turn. After each attempt he grinds it flat and this goes on until he is satisfied, then the drill bit gets smaller and so it goes on. After many hours you eventually get the hang of it, or so you thought because then you have to start drilling test holes to ensure that the drill cuts to size. Believe me, you never forget and it teaches you all you need to know about angles and clearances which applies to grinding other cutting tools as well.

Jon