Module 6: Materials & Hardware22 Aug 2026
why 120 degree for stainless not 118
Exam question
When drilling stainless steel, use a
- A.drill ground to 120 °, slow cutting speedCorrect
- B.drill ground to 90 °, fast cutting speed.
- C.drill ground to 90 °, slow cutting speed.
Explanation
Stainless steel is drilled with a drill ground to about 120° at a slow cutting speed.
Budi S.
asked · 22 Aug 2026
always use 118 degree drill for normal jobs. why stainless need 120 and slow speed, not fast like i thought for harder metal. is it because it work hardens if you go too fast? anyone know the actual reason not just the answer