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Glenn

Knife Class Log 107, Sharpening

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Could you elaborate a little?  What's the danger or down side of using one of these CBN wheels on mild or medium carbon steel?  I don't know much about them, but a quick look had me thinking they might be worth the investment.   However, if they shouldn't be used for general purpose grinding I wouldn't want to spend that kind of money on them.

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The Radius Edge wheel is 8" in diameter and has a 5/8" arbor hole.
  1. Diameter = 8"
  2. Wheel width = 1.5"
  3. Arbor hole = 5/8"
  • CBN (cubic boron nitride) grinding wheels are state-of-the-art for grinding high-speed steel tools
  • These wheels are designed for use with bench-type grinders. 1800 rpm or 3600 rpm
  • Perfect for sharpening woodturning tools (high speed steel)
  • Provides a superior edge compared to the old stone wheel
  • Balanced – does not require "truing" 

These wheels will change the way you sharpen forever – Think razor sharp edges.

CBN or Cubic Boron Nitride grinding wheels are designed for sharpening high speed steels only and should not be used for other applications. These wheels have a 1.5" face so they are easy to use and work well with the Wolverine Sharpening System. The 180-grit wheel puts almost a mirror finish on your edges and makes them "scary sharp."

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Another commercial source notes "CBN Grinding Wheels are designed to be used to sharpen hardened Steel or Carbide. Sharpening non-heat treated steel, aluminum or other soft metals will damage the CBN Grinding Wheel."

Other sources note that it is intended for hard materials (glass, carbide, hardened steel, etc). I'm suspecting that softer materials will gum up the wheel and reduce its effectiveness.

Addendum: here's an article from a woodturner about his discovery of CBN wheels and discussion of their uses. Looks like I was right about softer materials gumming up the surface, but he has recommendations on what to do about that: https://www.robohippy.net/featured-article/

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Makes sense.  Thanks for doing the leg work (or finger work as the case seems to be) on this.  They still might be worth the investment, but I was really hoping to get rid of the other wheels forever without losing any capability.  It doesn't appear that's an option yet.

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Looks like it's only an option for finish grinding post-heat treatment. Gonna have to stick with conventional belts and wheels for the rest. And wear your safety glasses!

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