1) Disc sizes & maximum RPM

Never exceed the printed max RPM on the disc label. Match guard and flange to disc size — this is core to safety and cut quality.

2) Disc types: what to use and why

3) Corded vs cordless: runtime, torque & brakes

• Cordless (18V/36V): mobility and quick jobs; modern packs + brushless motors deliver strong torque with electric brakes for faster stops.
• Corded (900–1500 W+): steady power for long grinding sessions; consider soft start and constant electronics.
• Large 230 mm: deep cuts in paving/blocks; needs two-handed grip and space awareness.

4) Control & finish quality

• Let the abrasive do the work; excess pressure overheats discs and burns steel.
• Keep the wheel square to the cut; a wandering angle makes the slot snake and binds the disc.
• Step grits on flap discs (P60 → P80/120) for weld blending before paint.
• On diamond blades, steady feed prevents glazing; “dress” briefly on soft material if cut slows.

5) Safety snapshot: kickback & PPE

• Use guards, side handle, and correct flanges. Replace damaged discs immediately.
• Kickback happens when the disc binds; align work, support offcuts, and avoid twisting the tool.
• Wear goggles/face shield, ear protection, gloves, snug sleeves. No loose clothing.
• For masonry, use respirator (fine dust) and manage bystanders/wind direction.

6) Materials matrix (quick picks)

7) Troubleshooting

• Disc stalls/glazes: reduce feed; check disc type; “dress” diamond blade.
• Blue heat marks: lighten pressure; step to finer grit; cool the work.
• Wavy cut: re-mark line; stabilize work; keep wrist neutral and speed steady.

8) When to switch tools

• Need a straight long rip in timber? See Saws.
• Deep holes/anchors in concrete? See Rotary Hammers.
• Precise drilling in metal/wood? See Power Drills.