Definition
A single-point metal cutting tool, used in a lathe or shaper, whose tip is ground to a diamond shape with a sharp leading point. It is used to take light finishing cuts, square up shoulders, and clean up corners on metal workpieces.
Plain English
A lathe cutting bit with a pointed, diamond-shaped tip used for fine, light cuts and finishing work on metal parts.
Context Anchor
Seen in aircraft maintenance and machine-shop work when making or repairing metal parts.
Derivation
Named for the shape of the cutting tip when viewed from above — a four-sided diamond shape with one corner forming the cutting point. The name describes the geometry, not the material; the tool is normally made of high-speed steel or carbide, not actual diamond.
Why Pilots Care
For maintenance work, the shape of the cutting tool affects the shape, fit, and finish of the part being made or repaired.
Intuition Check
Do not assume “diamond-point” means the tool is made of diamond. Here, “diamond” mainly describes the pointed shape of the cutting end.
Example Sentence 1
The mechanic used a diamond-point cutting tool to take a light finishing cut on the engine mount bushing.
Example Sentence 2
Before riveting, the technician cleaned the edge with a diamond-point cutting tool to ensure a smooth fit.