What You Should Know About Grinding Wheel Guards | Norton ...
Incorrect: Straight cutting off wheels such as Type 41 (formerly denoted as Type 1) used on a portable angle grinder with a Type 27 28 raised hub or depressed center grinding wheel guard. Explanation: Type 27 28 guards are open on the bottom to allow for side grinding with raised hub/depressed center wheels. When side grinding with the Type 27 or Type 28 wheel, the work piece acts as a ...