Lathe cutting tool nomenclature: identify the incorrect statement Review common surfaces/parts of a single-point lathe tool: flank, nose, heel, and base. Choose the statement that is incorrect.
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AThe flank of the tool is the surface below and adjacent to the cutting edges.
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BThe nose is the corner, arc, or chamfer joining the side cutting and end cutting edges.
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CThe heel is that part of the tool which is shaped to produce the cutting edges and the face.
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DThe base is the surface of the shank that bears against the support and takes the tangential cutting pressure.
Answer
Correct Answer: The heel is that part of the tool which is shaped to produce the cutting edges and the face.
Explanation
Concept/ApproachStandard lathe tool terms: the face (rake face) is where chips flow; the flanks are relief surfaces below/adjacent to cutting edges; the nose is the joining arc/chamfer; the base of shank bears on the tool post; the heel is the lowest portion of the flank near the base—not the part shaped to create the cutting edges (that shaping defines the tool point).
Why option (c) is incorrectThe part shaped to produce edges/face is the cutting point and rake/relief geometry, not the heel. Therefore (c) is wrong; the other statements reflect standard definitions.
Final AnswerThe heel statement (option C) is incorrect.