The hardness of a grinding wheel is specified by a letter of alphabet. The alphabets A to H are soft grades, I to P are medium grades and Q to Z are hard grades.
26) The grade of a grinding wheel is specified by letters from A to Z. Which one of the following refers to the hardest grade ?
Related Grinding MCQ - Machinist(Set-1) with Answers
All of the above
Natural abrasives are
A grinding wheel consists of the abrasive that does the cutting, and the bond that holds the abrasive particles together.
There are two types of abrasives.
1. Natural abrasive The natural abrasives are emery and corrundum,These are impure forms of aluminium oxide.
2. Artificial abrasive Artificial abrasives are silicon carbide and aluminium oxide.