NT WorkSafe safety alert emphasises dangers of severe injury or fatality when operating 9-inch angle grinders

NT WorkSafe Safety Alert Highlights Serious Injury Risks with 9-Inch Angle Grinders

NT WorkSafe has released a safety alert warning of the dangers linked to using 9-inch angle grinders, following an incident earlier this year in which a worker narrowly escaped death.

Summary: A 71-year-old worker suffered severe injuries after switching from a 5-inch grinder to a 9-inch angle grinder while cutting steel wall frames on a ladder. NT WorkSafe's alert outlines contributing factors and steps businesses should take to reduce the risk of similar incidents involving power tools and plant used at height.

What Happened in the Winnellie Incident

In January this year, a 71-year-old employee sustained severe injuries while operating a 9-inch angle grinder during renovation activities at an industrial facility in Winnellie.

NT WorkSafe said the worker was positioned on a ladder, cutting steel wall frames overhead when the incident took place.

"The worker had been using a 5-inch angle grinder to make the initial cuts but switched to the larger grinder to finish the job quicker," NT WorkSafe indicates in the safety alert.

"The grinder kicked-back causing a laceration that ran from the worker's face, along his throat and into his chest."

Why 9-Inch Angle Grinders Pose Greater Risk

Larger discs on 9-inch angle grinders generate significantly more torque and kickback force than smaller 5-inch models, making them harder to control—especially when operating from a ladder or other elevated position.

Businesses should assess whether a 9-inch angle grinder is genuinely required for a given task, or whether a smaller, more controllable tool would suffice. Reviewing safe operating procedures for plant and power tools can help identify safer alternatives before work begins.

Recommended Actions for Employers

To reduce the risk of severe injury or fatality when operating angle grinders, employers should consider:

• Avoiding grinder use while positioned on ladders where possible; use appropriate elevated work platforms instead
• Matching grinder size and disc type to the specific cutting task, rather than choosing a larger tool for convenience
• Providing adequate training on kickback risks associated with 9-inch angle grinders
• Ensuring guards remain fitted correctly on all plant and power tools
• Reviewing risk assessments for tasks involving overhead cutting

Organisations looking to strengthen their broader safety systems may also benefit from reviewing our safety software solutions, which support consistent documentation and incident reporting across plant and equipment use.

Related Safety Alerts and Resources

This latest warning follows a related update covered in our article on angle grinder injuries prompting an NT WorkSafe safety warning, which discusses similar incidents involving powered cutting tools.

Businesses managing tasks at height alongside grinding work should also review guidance in WorkSafe New Zealand's safety alert on working at height and WorkSafe's guidance on scissor lift safety, both of which cover elevated work practices relevant to this type of incident.

Where plant maintenance or renovation work overlaps with electrical hazards, teams should also ensure compliance using our electrical safety checklist and supporting electrical safety policy documentation.

Further details on potential contributing factors and necessary actions can be found here.

For assistance implementing safe operating procedures across your organisation, visit our support page for further guidance.