UNIT 3 machining time calculation

What is the formula for calculating cutting speed in m/s?

• A. πdn
• B. (πdn)/60
• C. (πnd)/60
• D. πd/n

What is the formula for calculating the cutting time?

• A. (L+S)/f
• B. (L-S)/f
• C. (L×S)/f
• D. (L/S)×f

What is the formula for calculating the metal removal rate (MRR)?

• A. f×b×d
• B. d/(f×b)
• C. b/(f×d)
• D. f/(b×d)

A lathe has a spindle speed of 600 rpm, feed rate of 0.2 mm/rev and a depth of cut of 2.5 mm. What is the MRR?

• A. 24 cm³/min
• B. 30 cm³/min
• C. 36 cm³/min
• D. 48 cm³/min

A milling cutter is rotating at 1200 rpm. What is the cutting speed in m/s if its diameter is 50 mm?

• A. 12.56 m/s
• B. 31.4 m/s
• C. 47.1 m/s
• D. 62.8 m/s

A lathe has a spindle speed of 600 rpm and the workpiece has a diameter of 100 mm. What is the cutting speed in m/min?

• A. 94.25 m/min
• B. 62.83 m/min
• C. 31.42 m/min
• D. 15.71 m/min

Which factor affects the MRR more significantly, cutting speed or feed rate?

• A. Cutting speed
• B. Feed rate
• C. Both cutting speed and feed rate affect MRR equally
• D. None of the above options