FLAP DISC SAFETY REFRESHER
1.PROPER GRINDING ANGLE AND SURFACE
It is important to use flap discs at the correct angle and on the correct surface. Using the incorrect angle or surface can cause epoxy wear, backing disc damage, or snagging. All of these can lead to separation of the flaps or backing disc breakage. Type 27 flap discs should be used at 0°-15° angle and Type 29 flap discs should be used at 15°-25° angle to the workpiece. Do not use flat or on the edge.
2. GUARDS
There is a common misconception that guards are not required when using coated abrasive products. This is simply not true. ANSI B7.7 Safety Requirements for Abrading Materials with Coated Abrasive Systems very clearly states that “If the machine is designed and equipped with guards, it shall not be operated without the guards properly installed and in place.” Flap discs are designed for use on angle grinders, which come equipped with guards. In addition, the 2017 revision of ANSI B7.1 Safety Requirements for the Use, Care and Protection of Abrasive Wheels makes specific mention of requirements for flap disc wheels: “Type 27 and 29 abrasive flap disc wheels are subject to all limitations of mounting and use listed for Type 27 wheels.” B7.1 goes on further to state, “These wheels are recommended only for use on specially designed and guarded machines.” Make sure your grinder has the proper guard, that it is in good condition, and that it is positioned between you and the disc. Should a breakage or flap separation occur, the guard is designed to contain the pieces and protect you from injury. Never use a grinder without a guard!
3. INSPECTION/HANDLING
Inspect flap discs for any signs of damage prior to using. A disc that has been dropped or otherwise mishandled can be damaged, which can lead to breakage. Do not use a disc that has been dropped or damaged.
