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Thread cutting tool geometry: ideal rake selection For a single-point thread cutting tool, which rake setting is ideal to preserve thread form accuracy and edge strength? Choose the best option.

Difficulty: Easy

Zero rake angle (flat top)
Positive rake angle (e.g., +10°)
Negative rake angle (e.g., −5°)
Only a specified point angle is required

Correct Answer: Zero rake angle (flat top)

Explanation:

Approach
A zero top rake keeps the included profile angle of the thread unchanged and provides a strong cutting edge for intermittent loads typical during threading.

Notes
Some materials may allow small positive rake with corrective geometry, but the standard teaching is zero rake to preserve the exact thread form.

Final Answer
Zero rake angle (flat top).

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