14 • Non - Reinforced cut - off wheels are designed for use on “fixed base” types of machines where the work is securely clamped, guarded, and where the wheel operates on a controlled cutting plane . • Wheels with a “W” reinforcement (reinforcement around the hole) are not considered to be truly reinforced . • Clamp or fixture the workpiece for straightest cuts • Run wheels at the highest possible speed marked on the wheel and make cuts as quickly as possible . • It is recommended that a cut - off machine should have 1 horsepower for every inch of wheel diameter . For less than this, we recommend using a softer specification . • Using a harder grade wheel increases wheel life, but it also increases burn, power required and decreases cut rate . • Using a coarser grit wheel increases wheel life and cut rate, but it also increases burr and power required . It is the user’s responsibility to refer to and comply with ANSI B7 . 1