8 files changed, 107 insertions, 0 deletions
diff --git a/3257/CH9/EX9.1/Ex9_1.sce b/3257/CH9/EX9.1/Ex9_1.sce
new file mode 100755
index 000000000..595450590
--- /dev/null
+++ b/3257/CH9/EX9.1/Ex9_1.sce
@@ -0,0 +1,12 @@
+// chip dimensions in grinding
+clc
+D = 150 // diameter in mm
+d = 0.03 // depth in mm
+C = 3 // per mm^2
+r = 12 // radius in mm
+v = 0.4 // velocity in m/sec
+V = 25 // velocity in m/sec
+printf("\n Example 9.1")
+l = sqrt(D*d)
+t = sqrt((4*v/(V*C*r))*sqrt(d/D))
+printf("\n Length of chip is %.2f mm. \n Thickness of chip is %.3f mm.",l,t)
diff --git a/3257/CH9/EX9.1/Ex9_1.txt b/3257/CH9/EX9.1/Ex9_1.txt
new file mode 100755
index 000000000..a93e78b20
--- /dev/null
+++ b/3257/CH9/EX9.1/Ex9_1.txt
@@ -0,0 +1,4 @@
+ 
+ Example 9.1
+ Length of chip is 2.12 mm. 
+ Thickness of chip is 0.005 mm. 
+\ No newline at end of file
diff --git a/3257/CH9/EX9.2/Ex9_2.sce b/3257/CH9/EX9.2/Ex9_2.sce
new file mode 100755
index 000000000..c2e7ff0a7
--- /dev/null
+++ b/3257/CH9/EX9.2/Ex9_2.sce
@@ -0,0 +1,17 @@
+// Forces in surface grinding
+clc
+d = 0.04 // depth of cut in mm
+D  = 200 // diameter in mm
+N = 3600 // Rotation in rpm
+w = 20 // width of cut in mm
+v = 1200 // velocity in mm/min
+u = 41 // specific energy in W-s/mm^3
+x = 0.3 // fractional increase
+printf("\n Example 9.2")
+mrr = d*w*v*10
+power = u*mrr/60
+T = power/(2*%pi*N/60)
+F_c = T/(D*1e-3/2)
+F_n = (1+x)*F_c
+
+printf("\n\n Forces in surface grinding are as: \n F_c:%d N \t F_n: %d N",F_c, F_n)
diff --git a/3257/CH9/EX9.2/Ex9_2.txt b/3257/CH9/EX9.2/Ex9_2.txt
new file mode 100755
index 000000000..e38ff4ce5
--- /dev/null
+++ b/3257/CH9/EX9.2/Ex9_2.txt
@@ -0,0 +1,5 @@
+ 
+ Example 9.2
+
+ Forces in surface grinding are as: 
+ F_c:174 N 	 F_n: 226 N 
+\ No newline at end of file
diff --git a/3257/CH9/EX9.5/Ex9_5.sce b/3257/CH9/EX9.5/Ex9_5.sce
new file mode 100755
index 000000000..556a76228
--- /dev/null
+++ b/3257/CH9/EX9.5/Ex9_5.sce
@@ -0,0 +1,21 @@
+// Machining time in electrochemical machining vs. drilling
+
+clc
+d = 12 // hole diameter in mm
+I = 5 // current density in A/mm^2
+C = 1.5 // material constant in mm^3/A-min
+neeta = 0.92 // efficiency 
+depth = 15 // depth of hole in mm
+N = 325 // rotation in rpm
+f1 = 0.15 // feed in mm/rev
+
+printf("\n Example 9.5")
+f = C*I*neeta // feed rate
+T_e = depth/f // time by electrochemical machining
+f_rate = N*f1
+T_d = depth/f_rate// time by drilling
+t_ratio = T_d/T_e
+printf("\n Machining time in electrochemical is %.2f min.",T_e)
+printf("\n Machining time in drilling is %.2f min.",T_d) // answer in boook is 0.030 
+printf("\n Machining time in drilling is %d %% of ECM. ",t_ratio*100)
+
diff --git a/3257/CH9/EX9.5/Ex9_5.txt b/3257/CH9/EX9.5/Ex9_5.txt
new file mode 100755
index 000000000..0bf1a4282
--- /dev/null
+++ b/3257/CH9/EX9.5/Ex9_5.txt
@@ -0,0 +1,5 @@
+ 
+ Example 9.5
+ Machining time in electrochemical is 2.17 min.
+ Machining time in drilling is 0.31 min.
+ Machining time in drilling is 14 % of ECM.  
+\ No newline at end of file
diff --git a/3257/CH9/EX9.6/Ex9_6.sce b/3257/CH9/EX9.6/Ex9_6.sce
new file mode 100755
index 000000000..417ccf540
--- /dev/null
+++ b/3257/CH9/EX9.6/Ex9_6.sce
@@ -0,0 +1,34 @@
+
+//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
new file mode 100755
index 000000000..56374acc0
--- /dev/null
+++ b/3257/CH9/EX9.6/Ex9_6.txt
@@ -0,0 +1,9 @@
+ 
+ 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. 
+\ No newline at end of file