11-01-2018, 02:12 PM
(10-30-2018, 12:30 PM)EOU Wrote: Both studies indicate sub 200C (392F) temperatures when something on the order of only 5-8 microns of material is removed in a single pass. We'd think that 5-8 microns per pass would be regarded as a considerable amount of material removed when grinding (sharpening) a knife edge. These studies are detailed and we admit to only studying what seemed to be the pertinent parts. If anyone gleans something from them that we haven't, we would be pleased to learn what that might be.
5-8µ is approximately .0002- .0003". A tenth of thousandth of an inch is hard for me to describe. The only relatively common power tool I can think of that works with that kind of tolerance would be an extraordinarily expensive surface grinder.
It might be possible to remove that little material from a blade in one pass on a Kally with a 4K grit belt, but not even remotely possible with a 400 grit belt.
That seems to be the difference between what is possible under laboratory conditions compared to what is not even remotely applicable to sharpening knives.
Good try, Mike. I know you're trying to come up with scientific data that might be translatable to sharpening, but the more I see the less I believe such studies have been accomplished.
I still think Tempilaq can be used to gain some practical understanding of how much grinding it takes to produce a significant amount of heat. I'll give it a shot.