Definition of chamfering on a lathe Which statement best defines the chamfering operation performed on a workpiece at the lathe or during secondary finishing?

Introduction / Context:
Chamfering is widely used to deburr sharp edges, aid assembly, and improve aesthetics. It is a simple but important finishing operation in machining and fabrication.

Given Data / Assumptions:

• External edges on shafts, pins, and blocks often require a 30–45 degree chamfer.
• Chamfers can be produced by turning tools, chamfer mills, or hand tools.
• Objective: remove sharp corner, produce clean lead-in.

Concept / Approach:
A chamfer is a straight, flat, angled surface at an edge. On a lathe, a simple angular infeed with a turning tool creates the chamfer at the end face/outer diameter junction. It is distinct from knurling (pattern), undercutting/necking (narrow diameter reduction), counterboring (enlarging a hole with a flat bottom), and countersinking (conical recess).

Step-by-Step Solution:

Verification / Alternative check:
Engineering drawing standards specify chamfer dimensions (e.g., 2 x 45°) to indicate size and angle, confirming the operation’s nature.

Why Other Options Are Wrong:
Embossing pattern: describes knurling, not chamfering.Necking: reduces diameter locally; not a bevel.Counterboring/countersinking: internal hole features, not external edges.

Common Pitfalls:
Confusing chamfers with radii; a radius is curved, whereas a chamfer is a flat, straight bevel. Ensure burrs are removed fully to prevent assembly issues.

Final Answer:

Bevelling the extreme end of a workpiece