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.

For grinding carbide materials diamond wheel is used.

If the job is loosely fitted between centres in cylindrical grinding the job will become out of round.