In an orthogonal machining with a single point cutting tool of rake angle 10 , the uncut chip thickness and the chip thickness are 0.125 mm and 0.22 mm, respectively. Using Merchant s first solution for the condition of minimum cutting force, the coefficient of friction at the chip-tool interface is _____ (round off to two decimal places).

In an orthogonal machining with a single point cutting tool of rake an

1.	In an orthogonal machining with a single point cutting tool of rake angle 10 , the uncut chip thickness and the chip thickness are 0.125 mm and 0.22 mm, respectively. Using Merchant s first solution for the condition of minimum cutting force, the coefficient of friction at the chip-tool interface is _____ (round off to two decimal places).
A.	0.7355
B.	0.74
C.	0.243
D.	0.144
Answer» C. 0.243

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