Derek Cohen (in Perth, Australia)
Hi Warren

I echo your sentiment that it takes courage to challenge ones belief system, and David in particular must be commended.

I do not recall exactly when the video was made, or whether it was the source of data that "confirmed" existing beliefs. However for many years my view has been that the chip breaker (I will now no longer use the term "cap iron") had to be extremely close to the edge of the blade - within .1 or .2mm - or otherwise it was ineffective. With this in mind it has always appeared too difficult or too much trouble to go to. Consequently, it was ignored. The chip breaker was just seen as a cap iron, that is, something to stiffen a blade.

The discussions we have had here over a period of months mark an evolution in the way we think about the chip breaker. We are no where close to the end of the journey.

Regards from Perth

Derek