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.
Mechanical Engineering
Production Engineering
Difficulty: Easy
Choose an option
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AZero rake angle (flat top)
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BPositive rake angle (e.g., +10°)
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CNegative rake angle (e.g., −5°)
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DOnly a specified point angle is required
Answer
Correct Answer: Zero rake angle (flat top)
Explanation
ApproachA zero top rake keeps the included profile angle of the thread unchanged and provides a strong cutting edge for intermittent loads typical during threading.
NotesSome materials may allow small positive rake with corrective geometry, but the standard teaching is zero rake to preserve the exact thread form.
Final AnswerZero rake angle (flat top).