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why four facet grind?

Started by Ken S, November 13, 2022, 07:47:48 PM

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Ken S

This video by mrpete22 starts with a very well done illustration of the reason for a four facet grind. The initial illustration shows the common large chisel point bit. Mr. Pete explains the importance of using a smaller bit with a diameter of just larger than the chisel point for accurate drilling. The four facet point eliminates the chisel point and reduces the need for initially drilling a smaller hole.

Mr Pete is a retired shop teacher and a wealth of information. Here is the link: