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Rob Cosman's CBN Grinding Wheel: 8 inch

8 inch CBN grinding wheel
  • 8 inch CBN grinding wheel
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  • 8 inch CBN grinding wheel
  • 8 inch CBN grinding wheel
  • 8 inch CBN grinding wheel
  • 8 inch CBN grinding wheel
  • CBN Grinding Wheel
  • CBN Grinding Wheel
  • CBN Grinding Wheel

Rob Cosman's CBN Grinding Wheel: 8 inch

17 reviews

Regular price $0.00 USD $179.95 USD Sale

49 left in stock.
Full Description
Customer Reviews

When I discovered CBN grinding wheels it was a game changer for me.  They are such an improvement over ceramic stone grinding wheels that its almost unbelievable! I was so impressed that I replaced all the grinding wheels in my shop with CBN.

After using them for a while I felt I could make them a bit better for woodworking applications.  So after working with a manufacturer to incorporate the changes I wanted, we now offer a CBN wheel specifically designed for the discriminating woodworker.   

Unlike most CBN wheels our wheel is coated on all sides.  This gives you the flexibility to grind on the left and right side of the wheel without having to hold the blade upside-down as you do on wheels with the CBN coating only on one side of the wheel. 

Here is why our CBN grinding wheel is the best:

  • 80-Grit, Cubic Boron Nitride (CBN) coated wheel.  This cuts significantly faster as compared to typical 120 grit CBN or any other ceramic wheels.

  • 203mm (8 inch) diameter x 25mm (1 inch) wide, with 15.75mm (5/8 inch) arbor.

  • The wheel is coated with CBN from edge to edge on the wheel's 1 inch face, 3/4 inch of one side of the wheel and 5/16 inch on the opposite side of the wheel.
  • Wheel balance is not an issue because the wheel is machined from solid steel plate.

  • Solid steel wheel acts like a heat sink making tool overheating or burning much less likely.

  • CBN coating never loads up or requires dressing.

  • Economical: the CBN coating lasts for years under normal use


Cubic boron nitride, commonly known as CBN, is a man-made synthetic abrasive. CBN is made from cubic boron nitride grains bonded together by ceramic material.  CBN is the second hardest material after synthetic diamonds.

The process of making CBN abrasive is similar to that of synthetic diamonds: scientists treat hexagonal boron nitride at high temperature and pressure to create cubic boron nitride and treat graphite in the same way to create diamond.  

CBN is well suited for ferrous materials in grinding operations, as it will not carbonize when interacting with iron (Fe), as diamond abrasives may. Typically, CBN is used for grinding steel, cast iron, die steel, tool steel, super alloys, and in some cases ceramic materials.

CBN has several attractive characteristics that make it superior to diamond in grinding operations:

  • Withstands heat, especially during high-speed applications

  • Does not cause grit that can dull bits

  • Stays sharp and cool because it does not react with steel

  • Diamonds can also react with transition metals, limiting their usefulness for grinding certain materials. Cubic boron nitride is stable and does not tend to react unfavorably with standard transition metals.

CBN grinding wheels are made by electroplating CBN particles on steel, using electroplated nickel to hold the grit in place. A single layer of CBN grit applied to the surface of a metal disc can grind even the hardest surfaces and last for years.

Customer Reviews

Based on 16 reviews Write a review
Customer Reviews
4.9 Based on 17 Reviews
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Filter Reviews:
John G.

CBN Wheel

Works well but a little narrower than I expected: I like the abrasive in the side of the wheel.

United States United States


Installed easily and quickly onto my Rikon 80-805 bench grinder. No need to fuss with balancing or anything, it ran true out of the box. Cuts super fast and cool as advertised. A great upgrade for my shop.

Matt A.
United States United States


Installed easily onto my Rikon 80-805 8" bench grinder. No balancing required. Cuts extremely fast and cool. Wonderful upgrade for my shop

Scott B.
United States United States

Great Product

I'm still pretty much a novice when it comes to grinding and sharpening my chisels and plane irons. This wheel makes it easy to fix the chips I created by improperly preparing them earlier. It's a great product - like everything else I've ever gotten from them!

United States United States


The reviews aren't a lie, this is a game changer. Accurate, repeatable results with the satisfaction of knowing I now have the right tool for the job.