Cutting metal with an angle grinder is one of the most useful DIY skills you can learn. Whether you’re trimming bolts, cutting steel pipe, shaping sheet metal, or working on garden or home repairs, an angle grinder makes the job fast and accurate.
This guide gives you a clear, safe, step‑by‑step method for cutting metal, along with disc recommendations and beginner tips.
Step‑By‑Step: How to Cut Metal With an Angle Grinder
Below is a complete, beginner‑friendly procedure using the correct disc, grip, angle, and safety technique.
1. Choose the Correct Cutting Disc
Start Here
Selecting the right disc ensures a clean, safe cut.
- Use a 1.0–1.2mm thin metal cutting disc for most DIY jobs
- Check the disc is rated for your grinder’s RPM
- Avoid worn, cracked, or unbranded discs
2. Secure the Metal Properly
Warning
Loose metal causes vibration, binding, and dangerous kickback.
- Clamp the metal firmly using a vice or G‑clamps
- Ensure the cut line is fully exposed
- Never hold the metal by hand while cutting
3. Position Yourself Safely
Correct stance and grip reduce the risk of kickback.
- Hold the grinder with both hands
- Stand slightly to the side of the disc
- Keep the guard between you and the sparks
- Wear PPE: glasses, gloves, ear protection, dust mask
4. Start the Grinder and Let It Reach Full Speed
A stable RPM prevents disc wobble and snatching.
- Power on the grinder away from the metal
- Wait 1–2 seconds for full speed
- Keep your arms steady and locked in position
5. Begin the Cut Gently
Recommended
Light contact prevents binding and gives a cleaner cut.
- Touch the disc lightly to the metal
- Do not force the grinder — let the disc do the work
- Follow your marked line slowly and steadily
6.Complete the Cut and Smooth the Edge
Finishing the cut safely prevents sharp burrs.
- Once through, lift the grinder away smoothly
- Use a flap disc to smooth sharp edges
- Allow the metal to cool before handling
Which Disc Should You Use?
For cutting metal, always choose:
- Thin metal cutting disc (1–1.2mm) → fastest, cleanest cuts
- Reinforced cut‑off wheel → safer for beginners
- 115mm or 125mm → standard UK sizes
See: Angle Grinder Discs Explained
Beginner Tips for Cleaner Cuts
- Mark your cut line clearly with a marker or scribe
- Keep the grinder straight — never twist mid‑cut
- Take breaks if the metal begins to glow red
- Let the disc cut at its own pace
- Replace discs early — worn discs spark more and cut poorly
Common Mistakes to Avoid
- Using a grinding disc instead of a cutting disc
- Forcing the grinder through the metal
- Cutting without clamping the workpiece
- Standing directly behind the disc
- Using cheap, unbranded discs
- Cutting toward the cable (corded grinders)
Safety Essentials
Always wear:
- Safety glasses or face shield
- Gloves
- Ear protection
- Dust mask (especially for rusty or painted metal)
For full safety guidance, see: How to Use an Angle Grinder Safely