Which tool is used to dent metal before drilling?

Which tool is used to dent metal before drilling?

• A. Centre punch
• B. Scriber
• C. Micrometer
• D. Spring dividers

Answer: (A)

Creating a precise starting point for a drill is essential to prevent the bit from wandering as it begins cutting. A centre punch is the tool that creates a small, accurate indentation on the metal surface. This dent acts as a guide for the drill bit, helping it stay on the mark and start exactly where you want. You strike the centre punch firmly with a hammer to leave a shallow dimple, which makes it much easier for the drill to bite straight away. In contrast, a scriber only marks a line on the surface and does not produce a guiding indentation. A micrometer measures small distances or diameters, not for marking holes. Spring dividers are used to transfer measurements or scribe arcs, not to create starting indentations for drilling.

Creating a precise starting point for a drill is essential to prevent the bit from wandering as it begins cutting. A centre punch is the tool that creates a small, accurate indentation on the metal surface. This dent acts as a guide for the drill bit, helping it stay on the mark and start exactly where you want. You strike the centre punch firmly with a hammer to leave a shallow dimple, which makes it much easier for the drill to bite straight away. In contrast, a scriber only marks a line on the surface and does not produce a guiding indentation. A micrometer measures small distances or diameters, not for marking holes. Spring dividers are used to transfer measurements or scribe arcs, not to create starting indentations for drilling.