Question: 5. Name the primary factor that causes a tool to lose its hardness. 6. Calculate the revolutions per minute for a lathe to cut a

5. Name the primary factor that causes a tool to lose its hardness.

6. Calculate the revolutions per minute for a lathe to cut a rough finish 3.920 in diameter of a gray cast iron shaft with a high-speed steel cutter. Make and explain any assumptions needed and use any data as needed from this manual.

7. A turning operation using a lathe with a 5.5 hp motor incurs an average primary cutting force of 525 lbs, what is the cutting speed?

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