Quote from: Thy Will Be Done on July 09, 2023, 07:14:05 PMQuote from: 3D Anvil on July 07, 2023, 06:43:22 PMAdding the grinder to the equation certainly introduces the risk of overheating, but I doubt he did any damage with those two quick passes on a leather wheel. It's also a variable speed grinder he's using.
You are certainly entitled to hold an opinion that it 'should be fine' but the reality is that the apex is so small (and most importantly has virtually no mass) that it can literally overheat in a fraction of a second and you would have no way of even detecting it. In my view, combining this with a Tormek is rather silly considering the whole point is to guarantee the edge doesn't overheat. You cannot do that with any non-cooled powered equipment, a guarantee, that is. They cannot know and neither can you, period.
I share your concern, but my opinion wasn't formed out of thin air, but rather from a review of Vadim's extensive testing of edges and specific comparisons of blades sharpened on Tormek alone, versus in combination with paper and felt wheels on grinders, versus, only on grinders, etc. This is also based on my own experience sharpening hundreds of knives -- mostly using Tormek to apex the blade, followed by honing on leather belts with various compounds. In my experience, the leather belts, at the slowest speed of a Work Sharp Elite belt grinder, produce significantly less heat than paper wheels or felt on a half-speed grinder. That said, I haven't tried a leather wheel on a grinder, so I can't speak to that specifically.
I think I'll do some side-by-side testing of my own, just for peace of mind. Will report my results when I get them.