Interesting essay, but I need pictures to fully understand it. In addition, names such as 'web', 'split point', 'modified split point' and ''secondary point angles' referring to a part of a drill are completely unknown to me. That is of course also due to the fact that English is not my native language, but also that I am a layman or at most a hobbyist in the craft field. Links to referenced articles might also help.
I hope you will comply, as your knowledge of the subject is apparently of great interest to those members of this forum.
I hope you will comply, as your knowledge of the subject is apparently of great interest to those members of this forum.