CBN Grinding Wheels and 3 bond systems

What are CBN Grinding Wheels?

CBN grinding wheels are used to grind hard materials such as hard ferrous materials, hardened steel, bearing steel and nickel based alloys. CBN is an acronym for “cubic boron nitride” and is the second hardest material known to man, right behind diamond. It has high abrasion resistance and high thermal conductivity – making it better than diamond when grinding for long periods and high temperatures.

It has a cubic crystal lattice, with its atoms arranged in a symmetrical, cube-shaped structure, very much like the crystalline structure of a diamond. Its material properties include extreme hardness, stability under heat, and superior chemical resistance.

How much do CBN grinding wheels cost?

CBN grinding wheels range in cost depending on the shape, diameter, thickness, grit, and other factors.

How do I use CBN grinding wheels?

Like other grinding wheels, CBN Wheels can be put on your grinder and spun at a rate recommended by the manufacturer (do not rotate a wheel faster than recommended). Use these wheels to sharpen tools, cut metals, or grind ferrous metals (a compound that includes iron) such as steel, stainless steel, carbon steel, or cast iron.

How do I take care of my new CBN grinding wheel?

Your wheel won’t need any cleaning or maintenance if you use it properly. Only use ferrous metals on the wheel. Soft or mild materials can clog pores and make the wheel loaded and unusable.

If you find the wheel becomes loaded, use the enclosed dressing stick to “open up” the wheel. Look at our website for instructional video.

What are CBN Wheels used for?

In a quick answer, they’re used to grind metal, specifically hardened steel. They’re used to sharpen, cut, or remove metal from hard surfaces. Use these wheels when you need a good consistent finish.

Grinding materials

Most notably CBN wheels are used to grind the following, they’re used to cut HSS metals, like wood tools, blades, bits, and cutters. This type of steel is better than the older high-carbon steel because it can withstand higher temperatures. When you’re tools become dull over time from use, a CBN wheel will bring them back to its sharp use.

CBN Wheel limitations

Not a lot can limit a CBN Wheel’s performance. What can hinder it, however, is improper use. Do not grind anything other than ferrous metals such as steel, stainless steel, carbon steel, or cast iron. Don’t use non-ferrous metals such as aluminum, copper, lead, zinc, and tin because they are too soft to be used on CBN Wheels and can clog the wheel, which will stop it’s grinding power.

Why should you use a CBN Grinding Wheel?

It will last longer than all other wheels — including diamond — when used against hard surfaces and high temperatures. It’s best used to grind Ferrous materials with a hardness greater than 42 Rc. It will last longer than all other wheels and give you the results you’re looking for.

  • Safety. CBN grinding wheels are far safer than conventional grit wheels.
  • Wet and dry grinding. Wet and dry grinding is possible with CBN wheels.
  • No dust. Compared to grit wheels, minimal dust is created when using these wheels. However exhaust ventilation is always recommended when grinding!!
  • Minimal heat. When used correctly (and with coolant) little to no heat is transferred to the workpiece using these wheels.

Can you grind Carbide with CBN Wheels?

No, diamond wheels are recommended for carbide, CBN wheels are recommended for steel.  If you have a product that is a combination of diamond and steel, such as a corrugated knife, give our technicians a call. A CDX wheel would typically be ideal for this application.


What are the downsides to CBN Grinding Wheels?

As long as you take care of your wheels, there aren’t many downsides.

Are CBN wheels worth it?

We at Eagle Superabrasives Inc. would say “yes!” Compared to traditional grit wheels they are expensive, however these wheels offer far higher performance rates and far longer life than traditional grit wheels.

Where do I get a CBN wheel?

We sell all types of CBN wheels.

Eagle Superabrasives, Inc. offers CBN wheels in three different bond systems: Hybrid, Resin, and Vitrified. The bond is what holds the abrasive material in place.

Hybrid Bond CBN Grinding Wheels

Hybrid Bond CBN Grinding Wheels

Used in the manufacture of D2, M2, Alloy and Super Alloy End Mills, Drills, and Reamers.

Our unique bond systems, comprised of a mixture of specially selected alloys, ceramics and diamond powders and coatings all sintered in environmental controlled furnaces, offer stock removal rates and tool edge retention that were unheard of only a few years ago.

Hybrid bonds have now become the industry standard bond type for all manufacturing of Ferrous based steel end mills, drills and reamers.

They offer the benefits of hugely reduced cycle times, with material removal rates of up to 10 times that of any resin bond product, wheel edge retention of more than 20 times that of resin bond wheels, lower spindle load, excellent thermal stability, reduced tool deflection plus longer spindle life and no therrmal damage to the tool .

Manufacturing capabilities of up to 10” Diameter

Resin Bond CBN Grinding Wheels

Resin Bond CBN Grinding Wheels

Resin bond is the most commonly used bond system that is used for grinding all types of Ferrous tools such as Tool Steel, Stellite, hardened Alloy and Super Alloys.

Commonly used for metal cutting, tools, glass, and ceramics. It’s cost-effective and highly efficient.

It offers good elasticity, superior surface finish and highly efficient grinding performance at a very cost effective price.

We offer two types of resin:

  1. Phenolic Resins. Typically used for wet or dry grinding, off-hand grinding, centerless grinding and general purpose tool room use.
  2. Polyimide Resins. These resins offer considerable performance increase over phenolic resins. Greater stock removal, better form holding, higher temperature tolerance and minimal wear are all benefits of polyimide body systems.

Manufacturing capabilities of up to 36” diameter

Vitrified Bond CBN Grinding Wheels

Vitrified Bond CBN Grinding Wheels

Vitrified bond CBN wheels are typically selected for grinding Camshafts and Crankshafts, internal and external grinding of cylinders, etc.

Vitrified bond wheels are extremely aggressive and free cutting and provide excellent tool life. They require less dressing and offer longer truing intervals than resin bond wheels. They are cool cutting and are suitable for “lights out” high production grinding in manufacturing environments.

  • Lasts 100-300 times longer than other grinding wheels (non-CBN).
  • Removes heat when grinding.
  • Adaptable to various spindle speeds.

Vitrified Bond – Min. Diameter 3/16 in. / Max. Diameter 39 in. (Segmented)