ME_365_HW8.pdf - Homework 8 ME 467 QUESTIONS 1 Why is Machining different from the previous processed presented in class up to this point Focus on how

ME_365_HW8.pdf - Homework 8 ME 467 QUESTIONS 1 Why is...

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Homework 8 ME 467 QUESTIONS: 1. Why is Machining different from the previous processed presented in class up to this point? Focus on how you shape the material into your final form. Answer: You create the shape in machining by removing material, whereas we have been creating forms from essentially net volumes in the past (casting and metal forming). Another acceptable answer: We have been exceeding either the melting temperature (casting, molding) or the yield strength/not UTS (forming) in past weeks. Machining addresses exceeding the UTS (removing chips). 2. In the Merchant equation, when the rake angle is increased, does the shear plane angle increase, decrease, or stay the same? Answer: When the shear rake angle is increased, the shear plane angle is increased. 20.7 Explain the difference between roughing and finishing operations in machining. Answer . A roughing operation is used to remove large amounts of material rapidly and to produce a part geometry close to the desired shape.

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