Sorry, forgot to answer your question about the wheel material. It looks like some kind of ceramic, but that's just a guess. I'd say they're true to their grit ratings. The 160 is quite aggressive.
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Show posts MenuQuote from: RickKrung on February 28, 2025, 02:57:41 PMThanks!Quote from: tgbto on February 28, 2025, 08:20:02 AMPlus I realized afterwards that a serration is not a half-circle, but rather a portion of it, so the diameter can be wider than the pitch.
...snip...
A radius gauge set, like below is the right tool to measure the serrations. Match the curvature of the gauge to any portion of a internal or external radius and read the measurement from the stamped markings.
Quote from: tgbto on February 27, 2025, 03:34:36 PMQuote from: 3D Anvil on February 26, 2025, 06:30:53 PM14mm is .55", which seems about right for most bread knives
Well my typical bread knife is akin to this one.
It has 35 serrations in less than 8.25", which is at most a .24" pitch.
On this other one, it looks like a .25" pitch at best (31 serrations in less than 8").
For both, the wheel will ride on the teeth.
Wolfgang demonstrates using the edge of the wheel with what looks like a 3-ish mm corner radius, which seems more like it. Typical triangular ceramic rods have an even higher curvature.
Quote from: tgbto on February 07, 2025, 08:26:05 AMQuote from: RickKrung on February 07, 2025, 02:03:27 AMQuote from: John_B on February 06, 2025, 08:57:33 PMAfter you use the angle setter you mat want to try coloring the knife edge with marker and rotate wheel ny hand to see what is removed. This is a double check on the setting.
I ALWAYS do this, no matter how I set the angle. On EVERY blade. On EVERY wheel diameter change (and even between Tormek diamond wheel changes where the diameter doesn't change).
Yes, that. It is a tremendous help when it comes to gauging what the motion has to be to sharpen the tip (and heel) properly.
Quote from: tgbto on February 26, 2025, 03:24:29 PMI hope I got that kind of basic math right, but I'll wager "R7" means a diameter of 14mm.
So for all knives with serrations spaced less than 14mm apart (which incidentally means all of my bread and frozen food knives), this wheel will grind the apex of the teeth and not the space in between the teeth.
Quote from: BPalv on February 13, 2025, 12:41:50 AMQuote from: kwakster on February 12, 2025, 07:28:25 PMPaper Wheels with diamond paste & oil do not overheat an edge.I gotta say, if you pull your knife across the wheel less than 5 mm a second I think you would still possibly hurt the temper. I think that is documented in Wootz's work.
Vadim's research & testing also proved that.
A Paper Wheel using the standard silicon carbide grit will also not overheat an edge, provided you use enough wax on it's surface so there is a complete coverage.
This is critical, and the wax is best applied like a crayon on a wheel that is turned by hand.
IMHO it wouldn't take much to heat a quarter micron thickness at the apex.
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