When cutting stronger materials you will use lower cutting speed. Which material condition requires lower speeds?

• A. Weaker
• B. Stronger
• C. Softer
• D. Brittle

Answer: (B)

Stronger materials require lower cutting speeds. When a material is stronger, it resists deformation more, which means the cutting action has to work harder and generates more heat and tool wear if the speed is too high. Slower speeds help control heat, improve chip formation, reduce built-up edge on the tool, and extend tool life, leading to a better surface finish and more stable cutting for hard materials. Softer or weaker materials typically tolerate higher speeds, while brittle materials may need cautious, slower speeds to avoid cracking or chipping.