How to Use an Angle Grinder Safely

Angle grinders are useful tools. They're also one of the most dangerous power tools you'll use. The disc spins at up to 12,000 RPM. Mistakes happen fast and hurt badly.

Here's how to use an angle grinder properly and safely.

Before You Start

Personal Protective Equipment

This isn't optional:

• Safety glasses or face shield - Sparks and fragments fly everywhere
• Hearing protection - Grinders are loud
• Gloves - Heavy-duty work gloves, not thin disposables
• Long sleeves - Sparks will land on exposed skin
• Steel-capped boots - In case you drop the tool

Check our PPE range if you need safety gear.

Check the Tool

• Guard is fitted and positioned correctly
• Handle is secure
• Disc is appropriate for the material and task
• Disc is not cracked, chipped, or worn thin
• No damage to the tool body or cable

Check the Workspace

• No flammable materials nearby (sparks travel far)
• Work piece is secured - clamped or held firmly
• Good footing - you need stable balance
• No one in the spark path

Using the Grinder

Starting Up

1. Hold the grinder firmly with both hands
2. Ensure the disc is not touching anything
3. Start the grinder and let it reach full speed
4. Only then bring it to the work piece

Cutting

• Use a cutting disc for cutting - never a grinding disc
• Cut straight through, don't twist or lever
• Let the disc do the work - don't force it
• Support the work so the cut doesn't pinch the disc

Grinding

• Use the face of the disc at 15-30 degree angle
• Move the grinder, don't hold it in one spot
• Apply moderate pressure - heavy pressure causes overheating
• Work with the rotation, not against it

Common Mistakes to Avoid

Using the Wrong Disc

Cutting discs are thin and designed for cutting only. Grinding discs are thicker. Using a cutting disc for grinding can shatter it. Using a grinding disc for cutting is inefficient and dangerous.

Removing the Guard

The guard is there for a reason. If you need to reach somewhere the guard prevents, reposition the guard - don't remove it.

Forcing the Tool

If you're pushing hard, something's wrong. The disc might be worn, you might be using the wrong disc, or the angle might be wrong. Forcing causes disc failure.

Using Damaged Discs

A disc with any crack, chip, or damage should be binned immediately. A failed disc at 12,000 RPM sends fragments everywhere at high speed.

Disc Types

• Grinding discs - Thick, for grinding and shaping metal
• Cutting discs - Thin, for cutting metal
• Flap discs - For finishing and blending
• Wire wheels - For rust and paint removal
• Diamond discs - For cutting masonry and tile

Always match disc type to task and material.

Storage and Maintenance

• Store discs flat and dry
• Check discs before each use
• Keep vents clear of dust
• Replace worn brushes (on brushed motors)
• Never use a damaged tool

Browse our power tools range for quality angle grinders from DeWalt and other trusted brands.