🔍 Key Concepts

• proper feed pressure when drilling metal • difference between cutting and rubbing with a drill bit • effect of chip formation and sound/noise during drilling

💭 Think About

• What is happening at the drill tip if it is making contact but not removing much metal? Is it cutting or mostly rubbing? • How does too little versus too much pressure affect the sound, heat, and chip formation when drilling metal? • Which of the choices describes a condition that would cause the bit to slide and squeak on the surface instead of biting cleanly into the metal?

✅ Before You Answer

• Make sure you understand how a properly ground bit behaves when the correct feed is applied (chip shape, sound, heat). • Consider which option would most likely cause slipping and friction noise rather than strong chip production. • Eliminate any choices that would normally still allow the bit to cut effectively without a high-pitched squeak.