Definition
A hand chisel whose cutting edge is ground to a sharp, four-sided diamond-shaped point. It is used in sheet metal and aircraft maintenance work to cut sharp internal corners, start holes for further cutting, and trim into tight angles where a flat chisel cannot reach.
Plain English
A small chisel with a pointed, diamond-shaped tip used to cut sharp corners or start a cut in metal where a flat-edged chisel won't fit.
Context Anchor
Seen in aircraft maintenance, especially in shop work involving metal parts, damaged fasteners, or tight corners that need careful cutting.
Derivation
Named for the shape of its cutting tip, which forms a four-sided point resembling a cut diamond gemstone. The shape concentrates force at a single point, allowing it to cut into corners and tight spaces.
Why Pilots Care
Allows mechanics to perform accurate metalwork during repairs without damaging surrounding structure.
Intuition Check
“Diamond” does not mean this chisel is made from diamond gemstone. Here it means the cutting end has a diamond-like shape for narrow cuts and corners.
Example Sentence 1
The mechanic used a diamond chisel to start a cut in the corner of the inspection panel where the flat chisel could not reach.
Example Sentence 2
Using the diamond chisel, the technician removed the raised edge left by the previous repair.