12-27-2017, 02:35 PM
Hypothetically and just for grins, imagine that a blade is sharpened on a Kally and the blade gets just barely warm. Not hot in the slightest, just warmed enough so that maybe it’s just possible to tell that the blade is warmer than ambient air temperature. Not even close to changing the color of the steel.
So what do you think is happening there? Is the edge apex getting super hot, like 3,000° and then warming the rest of the blade, or is the entire blade/belt contact area warming slowly at the same time? Or maybe both?
I’m having difficulty imagining that we really could be causing anything like 3,000° heating with very light sharpening.
I can understand that surprising things may happen on the molecular level, but if this super heating is on that level then, like I mentioned before, I would think that heating would of extremely short duration and the real world significance would be minimal.
That said, there has been some empirical evidence reported here that supports the idea edge heating significantly impacts blade performance. Mr. Me2 observed that blades power sharpened dented more easily when hacking through wood (bamboo?) dowels, and I’ve noticed that sometimes burrs seem far more malleable I would have thought suggesting that the steel hardness had been reduced. Hence my previous post about why are burrs so malleable.
Regardless, I'm not giving up my Kally!
It may be something I just have to live with whilst making a determined effort to keep heating with its associated deleterious ramifications to a bare minimum.
So what do you think is happening there? Is the edge apex getting super hot, like 3,000° and then warming the rest of the blade, or is the entire blade/belt contact area warming slowly at the same time? Or maybe both?
I’m having difficulty imagining that we really could be causing anything like 3,000° heating with very light sharpening.
I can understand that surprising things may happen on the molecular level, but if this super heating is on that level then, like I mentioned before, I would think that heating would of extremely short duration and the real world significance would be minimal.
That said, there has been some empirical evidence reported here that supports the idea edge heating significantly impacts blade performance. Mr. Me2 observed that blades power sharpened dented more easily when hacking through wood (bamboo?) dowels, and I’ve noticed that sometimes burrs seem far more malleable I would have thought suggesting that the steel hardness had been reduced. Hence my previous post about why are burrs so malleable.
Regardless, I'm not giving up my Kally!
It may be something I just have to live with whilst making a determined effort to keep heating with its associated deleterious ramifications to a bare minimum.