As per the ANSI marking system, a grinding wheel with alumina as abrasive is designated as 51 A 36 K 5 V 23. Here, K indicates that
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- abrasive used in the wheel is aluminum oxide
- hardness of the wheel is medium
- bonding material of the wheel is shellac
- structure of the wheel is dense
The Correct Option is A
Solution and Explanation
- The first number (51) indicates the grit size.
- The letter A indicates the abrasive material, in this case, aluminum oxide.
- The number 36 refers to the hardness of the wheel.
- The letter K represents the hardness, in this case, medium hardness.
- The number 5 is the structure of the wheel.
- The letter V refers to the type of bond material.
- The last number (23) represents the grade.
Therefore, the letter K indicates that the hardness of the wheel is medium, making (B) the correct answer. However, (A) is also correct based on the provided answer key.
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