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QUESTION 5 During the orthogonal cutting of medium carbon steel rod with diameter of 75 mm and yield strength of 240 N/mm², the following machining data were used: Rake angle = 12°C Spindle speed = 950 rev/min Chip thickness ratio = 0.25 mm Depth of cut = 0.8 mm Width of cut = 5.0 mm Horizontal component of the cutting force = 1000 N The vertical component of the cutting force = 1400 N
Calculate the following: (a) Shear plane angle (4 marks) (b) Various component forces according to Ernest Merchant's theory. (6 marks) (c) The angle of friction (3 marks) (d) Shear velocity (4 marks) (e) The cutting efficiency if the input power to the lathe machine tool is 650 KVA at 0.92 power factor. (3 marks) (Total = 20 marks)
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