1. Disc Size – The Primary Consideration
- 100/125 mm (4/5 inches)
Optimized for household and light-duty applications, including tile cutting, metal grinding, and grooving. Lightweight and ergonomic, it adequately fulfills most general tasks.
- 180/230 mm (7/9 inches)
Designed for heavy-duty tasks such as steel bar and concrete cutting. Delivers high power but is heavier; unstable handling may occur for inexperienced users. Not recommended as a primary tool for first-time buyers.
2. Power Rating – Focus on Wattage
- 600–900W
Sufficient for daily household and light industrial use, providing reliable performance and cost-effectiveness.
- 1000W+
Recommended for frequent cutting of thick profiles, pipework, and prolonged continuous operation.
3. Variable Speed Control – Optional but Advantageous
- Variable speed is recommended for stainless steel cutting and precision polishing to ensure high-quality finishes.
- Fixed speed is adequate for general cutting of brick, concrete, and mild steel.
4. Safety Features – Mandatory Evaluation
- Anti-restart function: Prevents automatic startup upon power restoration after an outage, significantly enhancing operational safety.
- Soft start: Reduces initial torque and improves control, particularly suitable for novice users.
- Anti-vibration handle: Minimizes hand fatigue and numbness during extended use (≥30 minutes).
5. Disc Change Convenience
Prioritize models equipped with a spindle lock mechanism and tool-free guard adjustment. These features streamline accessory changes and eliminate reliance on additional tools.
6. Brand Selection
- Premium tier (Bosch, Makita, DeWALT): Exceptional durability and stability; recommended for professional and high-intensity use.
- Mid-tier (Dongcheng, Dayi and Komater): Reliable performance for low-frequency household use at an affordable price point.
- Entry-level (< ¥100): Poor dynamic balance, excessive noise, and inadequate heat dissipation. Not recommended.
Summary of Recommendations
- Occasional household use: Dongcheng/Komater 100 mm, ~800W, equipped with anti-restart function.
- Professional renovation use: Bosch/Makita, 1000W+, with variable speed control.
Additional Notes
When purchasing, include a high-quality transparent safety guard and thickened cutting discs. These accessories typically offer superior performance compared to standard factory-supplied items.
