21.61 In Example 21.3, if the cutting speed V is doubled, will the answer be different? Explain. EXAMPLE 21.3 Effect of Cutting Speed on Material RemovalThe effect of cutting speed on the volume of metalremoved between tool changes (or resharpenings)can be appreciated by analyzing Fig. 21.16. Assumethat a material is being machined in the as-cast con-dition, with a hardness of 265 HB. Note that whenthe cutting speed is 60 m/min, tool life is about40 min. Therefore, the tool travels a distance of60 m/min x 40 minabout 5 min, and thus the tool travels 120 m/min x5 min = 600 m before it has to be replaced.Since the volume of material removed is directlyproportional to the distance the tool has traveled,it can be seen that by decreasing the cutting speed,more material is removed between tool changes. It isimportant to note, however, that the lower the cut-tìng speed, the longer is the time required to machinea part, which has a significant economic impact onthe operation (see Section 25.8).2400 m before it has tobe replaced. However, when the cutting speed isincreased to 120 m/min, the tool life is reduced to

Answered: In Example 21.3, if the cutting speed V…

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In Example 21.3, if the cutting speed V is doubled, will the answer be different? Explain.

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Concept explainers

Machining Processes and Machine Tools

Machining is represented as the process in which an excessive amount of substance is eliminated from the particular element in the form of pieces. In machining, cutting tools such as rotary tools, lathe, drill press, grinder, chop saw, welders, and many more are applied to get the desired shape. As compared to other manufacturing processes, machining is precise and versatile.

Question

21.61 In Example 21.3, if the cutting speed V is doubled,
will the answer be different? Explain.

EXAMPLE 21.3 Effect of Cutting Speed on Material Removal
The effect of cutting speed on the volume of metal
removed between tool changes (or resharpenings)
can be appreciated by analyzing Fig. 21.16. Assume
that a material is being machined in the as-cast con-
dition, with a hardness of 265 HB. Note that when
the cutting speed is 60 m/min, tool life is about
40 min. Therefore, the tool travels a distance of
60 m/min x 40 min
about 5 min, and thus the tool travels 120 m/min x
5 min = 600 m before it has to be replaced.
Since the volume of material removed is directly
proportional to the distance the tool has traveled,
it can be seen that by decreasing the cutting speed,
more material is removed between tool changes. It is
important to note, however, that the lower the cut-
tìng speed, the longer is the time required to machine
a part, which has a significant economic impact on
the operation (see Section 25.8).
2400 m before it has to
be replaced. However, when the cutting speed is
increased to 120 m/min, the tool life is reduced to

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