From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 3257/CH8/EX8.1/Ex8_1.sce | 18 ++++++++++++++++++
 3257/CH8/EX8.1/Ex8_1.txt |  4 ++++
 3257/CH8/EX8.2/Ex8_2.sce | 23 +++++++++++++++++++++++
 3257/CH8/EX8.2/Ex8_2.txt |  9 +++++++++
 3257/CH8/EX8.3/Ex8_3.sce | 10 ++++++++++
 3257/CH8/EX8.3/Ex8_3.txt |  4 ++++
 3257/CH8/EX8.4/Ex8_4.sce | 23 +++++++++++++++++++++++
 3257/CH8/EX8.4/Ex8_4.txt |  4 ++++
 3257/CH8/EX8.6/Ex8_6.sce | 21 +++++++++++++++++++++
 3257/CH8/EX8.6/Ex8_6.txt |  5 +++++
 10 files changed, 121 insertions(+)
 create mode 100755 3257/CH8/EX8.1/Ex8_1.sce
 create mode 100755 3257/CH8/EX8.1/Ex8_1.txt
 create mode 100755 3257/CH8/EX8.2/Ex8_2.sce
 create mode 100755 3257/CH8/EX8.2/Ex8_2.txt
 create mode 100755 3257/CH8/EX8.3/Ex8_3.sce
 create mode 100755 3257/CH8/EX8.3/Ex8_3.txt
 create mode 100755 3257/CH8/EX8.4/Ex8_4.sce
 create mode 100755 3257/CH8/EX8.4/Ex8_4.txt
 create mode 100755 3257/CH8/EX8.6/Ex8_6.sce
 create mode 100755 3257/CH8/EX8.6/Ex8_6.txt

(limited to '3257/CH8')

diff --git a/3257/CH8/EX8.1/Ex8_1.sce b/3257/CH8/EX8.1/Ex8_1.sce
new file mode 100755
index 000000000..55b62b93e
--- /dev/null
+++ b/3257/CH8/EX8.1/Ex8_1.sce
@@ -0,0 +1,18 @@
+// 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
--- /dev/null
+++ b/3257/CH8/EX8.2/Ex8_2.sce
@@ -0,0 +1,23 @@
+// 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
@@ -0,0 +1,10 @@
+// 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
@@ -0,0 +1,23 @@
+// 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
@@ -0,0 +1,21 @@
+// 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
-- 
cgit