ID grinding (inside diameter grinding)- Internal grinding is generally done to create a precision surface finish with great accuracy on the id (inside diameters). With this method the work piece is mounted in a chuck to allow rotation during the grinding operation. With this process the grinding wheel will move in and out of the inside diameter to remove material and achieve the dimensions and finish the customer requests.

OD grinding (outside diameter grinding)- Outside diameter or external grinding is the opposite id (inside diameter) grinding. Material is generally “held” between centers and the material is rotated as the grinding wheel travels up and down the part. Outside diameter grinding allows for any cylindrical work piece to be ground to a precise dimension and finish.