initial commit / add all books

10 files changed, 121 insertions, 0 deletions

diff --git a/3257/CH8/EX8.1/Ex8_1.sce b/3257/CH8/EX8.1/Ex8_1.sce
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+// Relative energies in cutting

+clc

+t_o = 0.01 // depth in mm

+V = 125 // velocity in m/min

+alpha = 10 // angle i degree

+t_c = 0.014 // depth of cut in mm

+w = 6 // width of cut in mm

+F_c = 55 // force in Kg

+F_t = 25 // force in kg

+printf("\n Example 8.1")

+r = t_o/t_c

+R = sqrt(F_c^2+F_t^2)

+Beta = acos(F_c/R)*180/%pi + alpha

+F = R*(sin(Beta*%pi/180))

+percentage = 100*(F*r/F_c)

+printf("\n Percentage frictional energy is %.1f%%",percentage)

+printf("\n Percentage shear energy is %.1f%%",100-percentage)

+

diff --git a/3257/CH8/EX8.1/Ex8_1.txt b/3257/CH8/EX8.1/Ex8_1.txt
new file mode 100755
index 000000000..342be22a6
--- /dev/null
+++ b/3257/CH8/EX8.1/Ex8_1.txt
@@ -0,0 +1,4 @@
+ 

+ Example 8.1

+ Percentage frictional energy is 44.4%

+ Percentage shear energy is 55.6%
\ No newline at end of file
diff --git a/3257/CH8/EX8.2/Ex8_2.sce b/3257/CH8/EX8.2/Ex8_2.sce
new file mode 100755
index 000000000..041705b76
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+++ b/3257/CH8/EX8.2/Ex8_2.sce
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+// Comparison of forming and machining energy

+clc

+d_i = 10 // diameter in mm

+l = 125 // length in mm

+del_d = 0.5 // reduction in diameter in mm

+K = 1275 // constant in MPa

+n = 0.45 // constant

+Es = 4.1 // Specific energy in machining in W-S/mm^3

+printf("\n Example 8.2")

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

+d_o = d_i - del_d

+epsilon = log((d_i/d_o)^2)

+u = K*1e6*epsilon^(n+1)/(1+n)

+W_tension = u*%pi*l*1e-3*(del_d*1e-2)^2

+

+printf("\n Work done by pulling in tension is %d Nm.",W_tension)

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

+V = %pi/4*(d_i^2-d_o^2)*l

+W_mach = Es*V

+ratio = W_mach/W_tension

+printf("\n Work done by machining on lathe is %d Nm.",W_mach)

+printf("\n Work done on machining is about %d time higher than that of tension.",ratio)

+

diff --git a/3257/CH8/EX8.2/Ex8_2.txt b/3257/CH8/EX8.2/Ex8_2.txt
new file mode 100755
index 000000000..78b642d59
--- /dev/null
+++ b/3257/CH8/EX8.2/Ex8_2.txt
@@ -0,0 +1,9 @@
+ 

+ Example 8.2

+

+ Part A:

+ Work done by pulling in tension is 317 Nm.

+

+ Part B:

+ Work done by machining on lathe is 3924 Nm.

+ Work done on machining is about 12 time higher than that of tension.
\ No newline at end of file
diff --git a/3257/CH8/EX8.3/Ex8_3.sce b/3257/CH8/EX8.3/Ex8_3.sce
new file mode 100755
index 000000000..7bba356c9
--- /dev/null
+++ b/3257/CH8/EX8.3/Ex8_3.sce
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+// increase in tool life by reducing the cutting speed

+clc

+n = 0.5 // Exponential factor

+C = 400 // Constant

+v_ratio = 0.5 // velocity 

+printf("\n Example 8.3")

+t_ratio = (1/v_ratio)^(1/n) // From Tylor's equation V*T^n = constant

+del_t = t_ratio -1

+printf("\n On making velocity to %.1f times of initial, \n Increase in life time is %d%%.",v_ratio,del_t*100)

+

diff --git a/3257/CH8/EX8.3/Ex8_3.txt b/3257/CH8/EX8.3/Ex8_3.txt
new file mode 100755
index 000000000..162fc5ab4
--- /dev/null
+++ b/3257/CH8/EX8.3/Ex8_3.txt
@@ -0,0 +1,4 @@
+ 

+ Example 8.3

+ On making velocity to 0.5 times of initial, 

+ Increase in life time is 300%.
\ No newline at end of file
diff --git a/3257/CH8/EX8.4/Ex8_4.sce b/3257/CH8/EX8.4/Ex8_4.sce
new file mode 100755
index 000000000..08ab679e3
--- /dev/null
+++ b/3257/CH8/EX8.4/Ex8_4.sce
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+// Material removal rate and cutting force in turning

+clc

+D_o = 10 // diameter in mm

+N = 360 // spindle rpm

+D_i = 9 // machined diameter in mm

+x = 1.75 // axial speed in mm/min

+l = 125 // length in mm

+rate = 4 // specific energy in W-s/mm^3

+printf("\n Example 8.4")

+V_o = %pi*D_o*1e-3*N

+V_i =%pi*D_i*1e-3*N

+d = (D_o-D_i)/2

+f = x*100/N

+mrr = %pi*(D_o-d)*d*f*N

+t = l/(d*N)

+power = rate*mrr/60

+T = power/(2*%pi*N/60) // torque

+F_c = T/((D_o-d)/(2*1000))

+printf("\n Material removal rate is %.2f mm^3/min.",mrr)

+// Answer in book is 2610.08 mm^3/min

+printf("\n Cutting force is %d N.", F_c)

+// Answer in book is 994N

+

diff --git a/3257/CH8/EX8.4/Ex8_4.txt b/3257/CH8/EX8.4/Ex8_4.txt
new file mode 100755
index 000000000..1f0c5c471
--- /dev/null
+++ b/3257/CH8/EX8.4/Ex8_4.txt
@@ -0,0 +1,4 @@
+ 

+ Example 8.4

+ Material removal rate is 2611.45 mm^3/min.

+ Cutting force is 972 N. 
\ No newline at end of file
diff --git a/3257/CH8/EX8.6/Ex8_6.sce b/3257/CH8/EX8.6/Ex8_6.sce
new file mode 100755
index 000000000..bb5189ba8
--- /dev/null
+++ b/3257/CH8/EX8.6/Ex8_6.sce
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+// Calculation of material removal rate, power required and cutting time in face milling

+clc

+D = 160 // diameter in mm

+w = 70 // width in mm

+l = 450//length in mm

+d = 3 // depth in mm

+v = 0.5 // velocity in m/min

+N= 120 // rotation in rpm

+p_u = 1.1 // unit power for material

+printf("\n Example 8.6")

+a = w*d

+mrr = a*v*1000

+l_c = D/2

+t = (l+2*l_c)/(v*1000)

+f = v*1000/(d*N*10)

+power = p_u*mrr/60

+

+printf("\n Material removal rate is %d mm^3/min.",mrr)

+printf("\n power required in milling is %.3f kW.",power/1000)

+printf("\n Required time for milling is %.2f min.",t)

+

diff --git a/3257/CH8/EX8.6/Ex8_6.txt b/3257/CH8/EX8.6/Ex8_6.txt
new file mode 100755
index 000000000..a236ee1ca
--- /dev/null
+++ b/3257/CH8/EX8.6/Ex8_6.txt
@@ -0,0 +1,5 @@
+ 

+ Example 8.6

+ Material removal rate is 105000 mm^3/min.

+ power required in milling is 1.925 kW.

+ Required time for milling is 1.22 min. 
\ No newline at end of file