Machining Maths: Cutting Speed, Feed and Travel Time

Machining Maths: Cutting Speed, Feed and Travel Time

Original quantitative topic practice in English. All 24 questions are included in a shuffled order. Each question supplies its own data and model assumptions; use only those assumptions. Choose one answer. Practice target: 20/24, not an official examination pass mark. Keep full intermediate precision. These exercises cover the calculation scope in the title; they do not constitute a full Red Seal examination, trade qualification, site design or operating specification.
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A paper milling exercise specifies a cutter diameter of 35 mm, cutting speed 135 m/min, 4 teeth and feed 0.11 mm/tooth. Use π=3.1416 and rpm=1000×speed/(π×diameter). The cut is 240 mm plus 12 mm approach and 8 mm overrun. Feed per minute = chip load × teeth × rpm. These are supplied calculation data, not recommended machine settings. Calculate the feed travel time in minutes. Keep intermediate values unrounded; round the final answer to 4 decimal places if needed.