City Guilds Model Questions Vol1 2019 Engineering Question 4
Practice objective / multiple choice question 4 from the 2019 City Guilds Model Questions Vol1 Engineering examination.
During a turning operation on a mild‑steel workpiece, the recommended cutting speed for the material is given by \(V = \frac{C}{\sqrt{d}}\) where \(C = 180\) (m·mm\(^{0.5}\)/min) and \(d\) is the depth of cut in mm. The tool‑life relationship follows Taylor's equation \(V\,T^{n}=K\) with \(n = 0.25\) and \(K = 1200\) (m·min\(^{0.25}\))/min. The operation requires a depth of cut \(d = 2\) mm and a feed \(f = 0.2\) mm/rev. The workpiece diameter is 100 mm.\n\n(a) Determine the cutting speed \(V\) that will give a tool life of at least 30 min.\n(b) Using that cutting speed, compute the material‑removal rate (MRR) in mm\(^3\)/min.
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This is City Guilds Model Questions Vol1 2019 Engineering Question 4. It is one of the objective questions from the 2019 City Guilds Model Questions Vol1 Engineering examination.
Difficulty level: Hard .
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