Grinder Safety Toolbox Talk: Talking Points, Questions and Checklist

This grinder safety toolbox talk is for fabricators, fitters, maintenance staff and anyone who picks up an angle grinder or cut-off tool, even occasionally. It takes about five minutes. The crew will leave with a pre-use routine for discs and guards, and a clear picture of how kickback and disc bursts happen.

Why does grinder safety matter?

Grinders spin small discs very fast, so a damaged or wrongly rated disc can break apart with real force. OSHA's abrasive wheel machinery rule (29 CFR 1910.215) requires wheels to be closely inspected and ring-tested before mounting. The machine's spindle speed must also be checked so it does not exceed the maximum speed marked on the wheel.

For portable tools, OSHA's guarding rule (29 CFR 1910.243) says right-angle grinder guards may expose no more than 180 degrees of the wheel. The guard must sit between the operator and the wheel, so fragments from a broken wheel are deflected away.

Grinders also vibrate. HSE lists hand-held grinders among the tools that can cause hand-arm vibration syndrome. These are US and UK examples, so check the rules where you work.

Talking points for your grinder safety toolbox talk

• Match the disc to the grinder. The disc's maximum speed (rpm) must be at least the grinder's rated speed, and its size must suit the guard. Never fit a larger disc from a bigger tool.
• Check the disc every time. Look for cracks, chips, missing pieces or damp and out-of-date discs. Discard any disc that has been dropped.
• Guard on and turned the right way. The guard sits between you and the disc, with the open side pointing away from your body.
• Two hands, side handle fitted. Where the grinder has a side handle, use it. A grinder held in one hand is hard to control when it snatches.
• Let it run up first. Start the grinder away from the work and let the disc reach full speed before contact. Never force the disc or twist it in the cut.
• Wear what's specified. Safety glasses under a face shield, gloves that suit the task, and hearing protection. Our eye and face protection talk goes deeper.
• Watch the sparks. Point sparks away from people, gas cylinders and anything combustible, and follow hot work rules where they apply.

Example to share with the crew

For example, a fitter needs to cut a bolt and the only cutting disc nearby is from a bigger grinder. To make it fit, he takes the guard off. The disc is rated for a lower speed than the smaller, faster grinder.

Ask the crew what went wrong, and how many separate checks were skipped. The answer is three: disc size, speed rating and guard.

Grinder checklist

• Disc speed rating is equal to or higher than the grinder's rated speed
• Disc is the right size and type for the tool and the task
• Disc is free of cracks, chips and damage, and is in date
• Guard is fitted and positioned between the operator and the disc
• Side handle is fitted where the grinder requires one
• Eye, face, hand and hearing protection are worn as specified
• Sparks are directed away from people and combustibles
• The grinder is unplugged or the battery removed before changing discs

Questions to ask the crew

1. What checks do you do before using a grinder?
2. Where do we keep spare discs, and how would you know one is the wrong rating?
3. Has a grinder ever snatched or kicked back on you, and what were you doing?

How to close the talk

The one takeaway from this grinder safety toolbox talk: right disc, guard in place, two hands and full speed before contact. Report damaged discs, missing guards or side handles to your supervisor or through the site's hazard reporting system. For more safety topics for toolbox talks, browse our toolbox talk library.