🔍 Key Concepts

• Proper layout and preparation before drilling in metalwork • The purpose of a pilot mark to keep the drill bit from wandering • Difference between marking lines and creating a positive locating dimple

💭 Think About

• Which option actually creates a small physical indentation that helps the drill bit stay in place when you start drilling? • Which methods are mainly for visual reference only, and which provides a mechanical guide for the drill point? • In shop practice, what is normally done right at the exact center point just before placing the drill there?

✅ Before You Answer

• Identify which choice produces a small conical dimple in the metal surface • Eliminate options that are only visual markings with no indentation • Think about which tool/method a machinist or metalworker uses immediately before drilling to keep the bit from slipping