Tech Corner: Bonded Abrasive Wheel Label Series – Understanding Wheel “Specification”
This is the first of a series of articles on bonded abrasive wheel labels.
The specification, or “spec”, of an abrasive grinding or cutting wheel will indicate of how the wheel is designed to perform.
The chart shown here breaks down Flexovit’s popular A30S specification and shows you the components of this and other abrasive wheels’ specifications.
Each abrasive grain, or “grit” (“A30” denotes Aluminum Oxide 30 grit, in this example), within the wheel is joined together by bond material. The strength with which this bond material holds the grain is known as the grade, or hardness, of the wheel. The measure of this strength is indicated by a letter grade (“S”, in this example) These letter grades run from the extremely soft “A” grade to the extremely “Z” grade bonds.
“Hard” wheels are those with more tenacious bonds. These wheels retain each abrasive grain longer, resulting in slower wheel wear and more cuts per wheel. In general, a hard wheel is designed to be used on soft materials, such as mild carbon steel and low grade stainless steel.
“Soft” wheels break down more rapidly, resulting in faster but fewer cuts of a better quality. This is because each abrasive grain is ejected before it becomes dull, and fresh abrasive grain is being exposed more regularly. In general, a soft wheel is designed to be used on hard materials, such as Inconel® and titanium.
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