Discussion
A 150 mm long 15 mm diameter stainless steel rod is to be reduced in a diameter to 12 mm by turning on a lathe one pass. The spindle rotates at 500 rpm and tool is travelling at an axial speed of 200 mm/ min. What is the time required for machining the steel rod:
Answer: C
The machining time is 0.75 min.
The tool travels along the full 150 mm length once, at an axial speed of 200 mm/min:
\[ T = \frac{150}{200} = 0.75\ \text{min} \]
The spindle speed and the diameters are not needed, since the axial feed rate is given directly in mm per minute: 500 rpm and 200 mm/min only fix the feed per revolution, 0.4 mm. 2 min, 2.75 min and 3.75 min would need a much slower feed or a longer travel.
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