Portable Grinder and Abrasive Wheel Compatibility
A Disc That Fits Is Not Necessarily Safe to Spin
An abrasive wheel can fit a grinder and still be unsuitable for its speed or the intended job. Choosing by diameter alone leaves a critical check unfinished. Before mounting a wheel, verify its identity, condition and compatibility with the machine. The grinder's spindle speed must not exceed the wheel's marked maximum operating speed. If a marking cannot be read or a wheel's condition is doubtful, pause the job and obtain a verified replacement. A short delay before starting is better than discovering a mismatch while the wheel is rotating.
Controls to confirm
- Match the wheel to the grinder and intended operation using the manufacturers' instructions. Confirm the wheel type, diameter, mounting arrangement and speed rating; never fit an oversized wheel or use an improvised adaptor.
- Have an appropriately trained person inspect and mount the wheel using the correct flanges and mounting procedure. Apply the inspection and testing requirements appropriate to that wheel type, including ring testing where applicable; reject damaged or suspect wheels.
- Keep the correct guard securely fitted and positioned between the operator and wheel. Check the tool controls, use the specified eye and face protection, and keep other people clear of the work area. Stop if the guard, wheel or tool is defective.
Today’s action
Before the next grinding task, compare the grinder and wheel markings with a colleague. Resolve any unreadable rating, incompatible mounting or damaged component before starting.
Source guidance
OSHA — Portable abrasive wheels: guarding, mounting, inspection and speed checks (1910.243(c))
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