Darmann Abrasive Products, Inc. designs, manufactures and markets fine grit bonded abrasive products. These include superfinishing, precision grinding and honing processes using diamond cup wheels and diamond grinding wheels to accomplish precision surface grinding.ISO 9001:2000 Registered

Precision Abrasive Tools

Hardness & Structure

Hardness (or grade) is determined by how well abrasive materials are held in place.

The hardness of an abrasive stone is largely determined by the amount of bond used to manufacture the product. Since most applications have narrow acceptance ranges for stock removal, finish requirements and cycle times, the production of fine grit, bonded abrasive products must be tightly controlled. Utilizing a proprietary tight tolerance grading methodology, Darmann ensures that stone and wheel production is consistent. The following table provides some factors to be considered when selecting a product grade.


Hardness Considerations
Harder Grades Softer Grades

Light Stock Removal

Heavy Stock Removal

Better Stone Life

More Free Cutting

Better Finish

“Rougher” Finishes

Small Contact Areas

Larger Contact Areas

Finish Positions

“Rougher” Positions

More Stone Pressure

Less Stone Pressure

Used on Softer Materials

Used on Harder Materials

 

Structure is determined by the volume and arrangement of abrasive grains within a stone or wheel. Abrasive tool performance is determined by the interaction of the abrasive grain, bond and porosity. The spacing of abrasive grains and pores should be evenly distributed to assure performance consistency. "Open" structured products provide better chip clearance, and are less subject to loading than a closed abrasive tool. "Closed" structure products are preferred for low stock removal and fine finisher applications.

 

GC Open Structure
GC Closed Structure
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Darmann Abrasive Products, Inc.
100 Sterling Street
Clinton, MA 01510
Phone: 800-536-4544
Fax: 800-736-3839
Email: info@domain.com
Darmann Abrasive Products, Inc. designs, manufactures and markets fine grit bonded abrasive products. These include superfinishing, precision grinding and honing processes using diamond cup wheels and diamond grinding wheels to accomplish precision surface grinding. Sitemap - Resources

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