Single-point tool geometry: The angle between the tool face and a line tangent to the machined surface at the cutting point is called the rake angle, not the “cutting angle”. Is the given definition correct?

Introduction / Context:
Precise terminology in tool geometry avoids confusion when setting up tools and analyzing forces. “Rake angle”, “clearance (relief) angle”, and “wedge angle” are distinct. The prompt statement labels a well-known definition with the wrong name, and this question checks recognition of the correct term.

Given Data / Assumptions:

• Single-point turning tool with conventional nomenclature.
• Angles measured relative to the work surface and cutting velocity direction.
• No special reference system (ASA/ORS/NRS) complications beyond the basic meaning.

Concept / Approach:
The angle between the tool face and a line tangent to the just-machined surface at the cutting point corresponds to rake angle (positive, neutral, or negative). The “cutting angle” is not a standard geometric term by itself; more accurately, the wedge angle equals rake angle complement with clearance, i.e., wedge = 90° − rake − clearance (in a simplified 2D view).

Step-by-Step Solution:

Verification / Alternative check:
Tool drawings, handbooks, and inserts catalogs consistently use “rake angle” for this definition; “cutting angle” is ambiguous and not preferred in scientific nomenclature.

Why Other Options Are Wrong:
Conditioning correctness on orthogonal/oblique or measurement system does not change the fundamental name “rake angle”.

Common Pitfalls:
Confusing rake angle with clearance angle; using nonstandard terms which lead to set-up errors and misinterpretation of chip formation behavior.

Final Answer:
Incorrect