Tool life testing on a lathe under dry cutting conditions gauge 'n' and 'c' of taylor tool life equation as 0.12 and 130 m/min. respectively. when a coolant was used, 'c' increased by 10%. the increased tool life with the use of coolant at a cutting speed of 90 m/min is

So % increment in tool life is equal to 4640 %.

Explanation:

Initially n=0.12 ,V=130 m/min

Finally  C increased by 10% , V=90 m/min

Let's take the tool life initial condition is and when C is increased it become .

As we know that tool life equation for tool

At initial condition ------(1)

At final condition -----(2)

From above equation

So increment in tool life =

                                           =

So % increment in tool life is equal to 4640 %.

it was a fall down when it happens

explanation: