Using the Taylor's tool life equation with exponent n = 0.5, if the cutting velocity is reduced by half, the ratio of new tool life to original tool life is _______.

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JKSSB JE Mechanical 02 Nov 2021 Shift 1 Official Paper
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  1. 0.5
  2. 4
  3. 2
  4. 1

Answer (Detailed Solution Below)

Option 2 : 4
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Detailed Solution

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Concept:

Taylor’s Tool Life Equation based on Flank Wear:

VTn = C

Where, V = cutting speed (m/min), T = Time (min) (time taken to develop certain flank wear), n = an exponent that largely depends on tool material, C = constant based on tool and work material and cutting condition.

Calculation:

Using the Taylor’s tool life equation with exponent n = 0.5, if the cutting speed is reduced by 50%, the ratio of new tool life to original tool life is

Given: n = 0.5, V2 = 0.5 V1

V1T1= V2T2n

\(\frac{{{T_2}}}{{{T_1}}} = {\left( {\frac{{{V_1}}}{{{V_2}}}} \right)^{\frac{1}{n}}} = {\left( 2 \right)^{\frac{1}{{0.5}}}} = {2^2} = 4\)

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