GATE 2016 ME (ME1) – Question 34
In an orthogonal cutting process the tool used has rake angle of zero degree. The measured cutting force and thrust force are 500 N and 250 N, respectively. The coefficient of friction between the tool and the chip is _________
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Show answer and explanation
Correct answer: 0.49 to 0.51
Explanation
Resolve measured forces onto the rake face: friction F=Fc sinα+Ft cosα and normal N=Fc cosα−Ft sinα. At α0°, F=Ft=250N and N=Fc=500N. Thus μ=F/N=**0.50**. The simplification depends on the zero rake angle.