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diff --git a/3257/CH9/EX9.6/Ex9_6.sce b/3257/CH9/EX9.6/Ex9_6.sce
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+

+//Machining time in electrical discharge machining vs drilling

+clc

+d = 12.5 // hole diameter in mm

+I = 100 // current density in A/mm^2 for EDM

+I1 = 5 // current density in A/mm^2 for ECM

+h = 20 // depth in mm

+C = 1.5 

+neeta = 0.92 // efficiency 

+depth = 15 // depth of hole in mm

+N = 325 // rotation in rpm

+f1 = 0.15 // feed in mm/rev

+T_m = 1873.15 // melting point of titanium in K

+t_m = 1373.15 // melting point of electrode in K

+printf("\n Example 9.6")

+printf("\n\n Part A:")

+T_w = T_m -273.15 // melting point in Celsius

+mrr = 4e4*I*T_w^(-1.23)

+v = %pi/4*d^2*h

+t = v/mrr // time by EDM

+f = C*I1*neeta // feed rate

+T_e = depth/f // time by electrochemical machining

+f_rate = N*f1

+T_d = depth/f_rate// time by drilling

+t_edm_ecm = t/T_e // Time ratio between EDM and ECM

+t_edm_d = t/T_d // Time ratio between EDM and drilling

+printf("\n Machining time for EDM is %.1f min.",t)

+printf("\n This time is %.2f time of that for ECM. ",t_edm_ecm) // Answer in book is 2.35 time

+printf("\n This time is %.2f time of that for drilling. ",t_edm_d) // Answer in book is 11.3 times

+printf("\n Part B:")

+t_t = t_m - 273.15

+W_t = 1.1e4*I*t_t^(-2.38)

+printf("\n Wear rate of electrode is %.3f mm^3/min.",W_t)

+

diff --git a/3257/CH9/EX9.6/Ex9_6.txt b/3257/CH9/EX9.6/Ex9_6.txt
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+ 

+ Example 9.6

+

+ Part A:

+ Machining time for EDM is 5.4 min.

+ This time is 2.46 time of that for ECM. 

+ This time is 17.41 time of that for drilling. 

+ Part B:

+ Wear rate of electrode is 0.064 mm^3/min. 
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