In machining experiment, tool life was found to vary with the cutting speed in the following manner
|
Cutting speed (m/min)
|
Tool life (min)
|
|
60
|
81
|
|
90
|
36
|
The exponent (n) and constant (K) of the Taylor’s tool life equation are
(a) n = 0.5, and K - 540
(b) n = 1.0, and K = 4860
(c) n = -1.0, and K = 0.74
(d) n = -0.5, and K = 1.155
What is percentage increase in tool life when the cutting speed is halved.
(a) 50% (b) 200%
(c) 300% (d) 400%