The results of machining steel with 2 grades of tool material are given below. For a 180 min. Tool life which tool is recommended and why?
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A
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B
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Tool Taylor’ exponent
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0.2
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0.25
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Cutting Speed for 1 min tool life
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22 mm
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5 mm
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If the tool regrinding and changing time is 15min, the cutting speed for tool A has to be chosen (40m/min or 50m/min)