General Safety Guide for Bonded Abrasives
Grinding Wheels Improperly Used Are Dangerous – Adhere to A.N.S.I. Standards
The American National Standards Institute (“A.N.S.I.”) and the Occupational Safety & Health Administration (“O.S.H.A.”) have published standards concerning the proper use, handling, and storage of abrasive wheels.
It is recommended that all personnel involved in the use, handling and purchasing of abrasive wheels become familiar with these standards.
The following guidelines are based on material contained in A.N.S.I. B7-1, “Safety Requirements for the use, Care and Protection of Abrasive Wheels”.
- Handle all wheels carefully.
- Use suitable conveyance.
- Place wheels carefully.
- DO NOT drop, bump, or roll.
- DO NOT lean wheels against equipment.
- DO NOT place tools or any parts on top of wheels.
- DO NOT use trucks or conveyances, which do not provide firm support at all times when transporting wheels.
- DO NOT toss or throw wheels when placing on a shelf or rack, or in bins, boxes or drawers.
- Use proper racks, bins, drawers or boxes. Adequate support must be provided to protect wheels while awaiting use. Also allow removal of wheels without disturbing or damaging others and use
on a rotational basis. (See A.N.S.I. B7-1 for example of storage rack.)
- DO NOT use a wheel that has been dropped or damaged.
- DO NOT expose wheels to water or other solvents.
- DO NOT expose wheels to high humidity or freezing temperatures.
- Always use a machine that is adequately guarded. Wheels can only be used on machines with safety guards that meet A.N.S.I . and O.S.H.A. specifications. Generally, a safety guard should enclose 1/2 of the wheel.
- Ensure that the tool has proper flanges. Generally, flanges should be one-third the diameter of the wheel or a minimum of one quarter.
- Flanges should be kept in good repair and must be checked periodically for flatness, burrs, or wear.
- Take proper care of equipment. Wheels can only be used on machines regularly maintained by qualified personnel including periodic checks of free running spindle speed.
- DO NOT remove the guard from the machine because wheel diameter is too large. This is an indication that the wheel is incorrect for that particular tool. Compare the rated speed for the wheel with the rated speed of the tool. The wheel’s rated speed must be equal to or higher than the tool’s.
- DO NOT mount a Type 1 wheel with unequal sized flanges.
- DO NOT store the machine with the wheel mounted.
- DO NOT attempt to check spindle speed with a tachometer while the wheel is on the tool.
- Visually inspect the wheels carefully for any evidence of damage in transit, handling, storage, or prior use.
- Perform a “ring test” to the wheel before mounting to detect concealed damage. To “ring test” a wheel, you tap it gently with a light, nonmetallic implement, such as the handle of a screwdriver for light wheels, or a wooden mallet for heavier wheels. A sound, undamaged wheel will give a clear tone. A cracked wheel will give you a dead sound. If a wheel gives a dead rather than a clear sound, it must not be used.
- DO NOT use a wheel that is in a damaged container without performing a “ring test”. Internal “stress cracks” could occur if a box has been dropped or slammed around during shipping.
- DO NOT mount a wheel with the power source engaged.
- DO NOT use wheels where the machine speed exceeds the maximum speed stated on the wheel.
- Use wheels with the machine guards in place at all times. Secure the work piece.
- Always wear impact resistant eye protection, such as impact resistant safety goggles.
- Always wear protective clothing.
- Allow a newly mounted wheel to run for one minute. Wheels should be allowed to run for one full minute with all guards in place before dressing or grinding.
- Let the wheel do the work.
- Know what you are trying to accomplish. (i.e. particular quality of finish, heavy stock removal, blending, cleaning, etc.)
- DO NOT tighten the mounting nut excessively.
- DO NOT grind on the side of a cutoff wheel.
- DO NOT grind completely flat with the wheel. Use proper grinding angle.
- DO NOT hold the grinder near your face when engaging the tool. Hold down and away.
- DO NOT jam work into the wheel or apply excessive pressure or in feed.
- DO NOT use wheels for purposes other than those for which they were designed. READ THE LABEL.