🔍 Key Concepts

• Standard twist drill geometry for mild steel • Difference between included angle for center punches/taps vs. drill bits • Effect of drill point angle on chip formation and cutting efficiency

💭 Think About

• Which of these angles is most commonly associated with a standard twist drill used in shop work on steel? • Think about which angles are more typical for layout tools (like center punches) versus cutting tools (like drills). • For drilling mild steel efficiently without rapid wear, should the angle be sharp and narrow, or more blunt and broad?

✅ Before You Answer

• Identify which option corresponds to the standard general‑purpose twist drill point angle for steel. • Eliminate angles that are more typical for taps/threads or center punches. • Ask yourself: which angle would balance strength at the drill tip and good cutting action in mild steel?