Tool life test on a lathe under dry cutting conditions gauge $n$ and $C$ of Taylor tool life equations as $0.12$ and $130$, respectively. When a coolant was used, $C$ increased by 10%. The increased tool life with the use of coolant at a cutting speed of $90m/min$ is

Q. The cutting speed is reduced by 75%. Using the Taylor equation $(V{T}^n=C)$ for tool life, the percentage increase in tool life is (Take n = 0.5 and C = 400)

Q. In a cutting test with 0.3 mm flank wear as tool failure criterion, a tool life of 10 min was obtained at a cutting velocity of 20 m/min. Taking tool life exponent as $0.25$, the tool life in minutes at 40 m/min of cutting velocity will be

Q. The tool life equation for HSS tool is $V{T}^{0.14}{f}^{0.7}{d}^{0.4}=\text{Constant}.$

The tool life (T) of 30 min is obtained using the following cutting conditions: V = 45 m/min, feed = 0.35mm, d= 2.0 mm. If feed (f) and depth of cut (d) are decreased individually by 25% and speed (V) is increased by 25%, the tool life (in min) will be:

Q.

Linked Question:
In a machining experiment, tool life was found to vary with the cutting speed in the following manner:

Cutting speed $\left(m/min\right)$	Tool life $\left(minutes\right)$
$60$	$81$
$90$	$36$

What is the percentage increase in tool life when the cutting speed is havled?