Geometry of a round-nose turning tool Evaluate the statement: “A round nose tool has no back rake and no side rake; only the nose radius defines its cutting geometry.”

Introduction / Context:
Single-point round-nose tools are used for light finishing and contouring. Besides nose radius, rake and clearance angles strongly influence chip formation, forces, and finish.

Given Data / Assumptions:

• General turning on a lathe.
• Round-nose profile at the cutting tip.
• Work materials and speeds vary.

Concept / Approach:
A round-nose tool still possesses geometric angles: back rake (in the feed direction), side rake (in the cutting direction), and clearances. These control effective rake at each point along the nose. The fact that the tool nose is rounded does not eliminate the necessity of rake angles; in practice, rakes are set to suit the work material (e.g., positive for aluminum, moderate for steels, near zero or slightly negative for certain bronzes/brass with specific geometries).

Step-by-Step Solution:

Verification / Alternative check:
Tool grinding charts for round-nose tools explicitly specify back rake, side rake, and clearances, along with nose radius.

Why Other Options Are Wrong:
Material-specific qualifiers do not make the base statement true; rake remains a design variable.Speed does not nullify the need for rake geometry.

Common Pitfalls:
Assuming nose radius alone governs finish; ignoring rake can increase forces and cause chatter or built-up edge.

Final Answer:

Incorrect