GATE ME 2019 Set 2 — Question 64
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Manufacturing Processes → Machining & Machine Tools → Merchant's Circle & Forces
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Question
In an orthogonal machining with a single point cutting tool of rake angle , 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).
Correct answer
0.72 to 0.76
Solution
Given:
Rake angle,
Uncut chip thickness, mm
Chip thickness, mmChip thickness ratio, Shear angle ():Merchant's first solution for minimum cutting force:Coefficient of friction ():
Rake angle,
Uncut chip thickness, mm
Chip thickness, mmChip thickness ratio, Shear angle ():Merchant's first solution for minimum cutting force:Coefficient of friction ():
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