BW8 CBN Mounted Points

BW8 CBN Mounted Points are small, precision super abrasive grinding tools made with cubic boron nitride (CBN) abrasive bonded into a form (usually resin or vitrified) and permanently mounted on a carbide shank for strength and rigidity.

• BW8 is a standardized cylindrical shape for internal or jig grinding
• Can be made with a bottom recess to reduce heat when bottom grinding.
• If shank diameter is larger than the wheel undercut if required

 General Features

• Abrasive: CBN (Cubic Boron Nitride) – ideal for hardened ferrous materials.
• Bond: Resin or vitrified bond depending on the application.
• Shank: Typically 1/8″, 3/16″, or 1/4″
• Grit sizes: Coarse to ultra-fine depending on finish requirements.
• Applications:
  • Internal grinding of dies, molds, and bearing races.
  • Sharpening cutting tools (HSS, carbide).
  • Deburring small internal features.
  • Precision finishing of hardened components.

 Advantages

• Superior wear resistance vs. conventional abrasives.
• Maintains shape longer, giving consistent accuracy.
• Cooler cutting than diamond when working on ferrous materials.
• Produces fine finishes on hardened steels.

Internal grinding is one of the most tricky of all grinding applications. In no other type of grinding can the entire range of factors change from one job to the next. Therefore, it is necessary to consider the specifics of each job separately in order to arrive at the best suited wheel for the job. In order to get the most out of tool life and production,  choosing the correct wheel for a job is very important. Unfortunately, this isn’t always the easiest decision to make, as many factors play into such a selection. What is the material, size of area to be ground, amount of stock to be removed, finish required, machine capabilities and a number of other factors

HOLE SIZE TO BE GROUND

In the case of Super abrasive internal grinding, the wheel is generally 40-60% the size of the hole diameter being ground. Larger diameter holes will require a lower percentage, while smaller holes require a greater percentage (see illustrations). The depth of the hole determines the length of the abrasive as well as the undercut (if required) and the overall length of the mandrel (abrasive length + shank length). The other basic variable to be considered in wheel size is shank diameter, and that is determined by the size of the collet, or simply by choosing the stiffest shank that will fit reasonably with the wheel diameter. In most cases, if the wheel diameter is smaller or equivalent in size to the shank diameter, an undercut may be required behind the wheel for needed clearance

GRIT SIZE SELECTION

Finally,  the grit of the wheel can be determined. This is accomplished by considering the median between stock removal and finish desired. A coarse grit will be more aggressive, but will consequently leave a rough finish, while the opposite is true for a finer grit. Braemar has experience working with grits as coarse as 30/40 and as fine as 2,000, so arriving at a figure to suit the need of individual customers is a commonplace operation.

RESIN BOND

Light Brown or green in color.  Cutting Speed: 4,000 to 6,500 S.F.P.M.  Wheels shipped ready to use Wheels should be indicated within .0005″ T.I.R. prior to grinding. May be trued with nibs designed for super abrasives followed by a dressing stick.  Braemar resin bond wheels will give you superior performance in a wide variety of applications where stock removal, and surface finishes is needed.

VITRIFIED BOND

Black or dark gray in color.  Cutting Speed: 4,000 to 6,500 S.F.P.M.  Wheels shipped ready to use Wheels should be indicated within .0005″ T.I.R. prior to grinding. May be trued with nibs designed for super abrasives followed by a dressing stick

Call (480) 966-9311 or Add to Quote for pricing.