Centre punch

 

Introduction
A centre punch is a hardened long slender tool that is machined and ground to a conical point of 90°. It is used to produce a 90° dent on the surface of material to start a drill hole or as the centre of a circle to be marked with a pair of dividers.

How to use it
Place the point in the correct position and hit centre punch with a hammer. A dent of 90° is left in the component.

Where to use it
Used when marking out or drilling holes.

Maintenance
Sharpening required when the point becomes blunt. Take care as over heating will soften the point.

OHS issues
Safety glasses must be used to protect eyes from shrapnel from the hit end of the centre punch or the hammer head. Take care not hit hand with the hammer.