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Q1: a lathe tool has to accommodate work between 25 and 300 mm in diameter. Six spindle speeds are required and the cutting speed is to be 25m/min. i) Find the six speeds a) if they are designed in geometric progression b) if they are designed in preferred numbers. ii) For both cases find the work diameter appropriate for each spindle speed iii) Plot the relation between the work diameter and the spindle speed for both cases. (6 marks) 02: During turning a mild steel component with an orthogonal tool a feed of 0.2 mm/rev was used at a cutting speed or 80 m/min. the cutting force was 20 kg while the feed force was 8 kg. If the chip thickness was 0.4 mm and the back-rake angle of the cutting tool was 15º find the followings: Shear angle) IL. Work done in shear III. Horse power (HP) if the diameter is 40 mm (6 marks) Fv
a Q2: A drilling operation is to be performed with a 12.7 mm diameter twist drill in a steel workpiece. TH hole is a blind hole at a depth of 60 mm and the point angle is 118°. The cutting speed is 25 m/min and the feed is 0.30 mm/rev. Determine (a) the cutting time to complete the drilling operation, and (b) metal removal rate during the operation, after the drill bit reaches full diameter. (10marks) 118 V-75m