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diff --git a/Machine_Design_by_U_C_Jindal/15-SHAFTS.ipynb b/Machine_Design_by_U_C_Jindal/15-SHAFTS.ipynb
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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 15: SHAFTS"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 15.2: S2.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"// sum 15-2\n",
+"clc;\n",
+"clear;\n",
+"dA=150;\n",
+"dB=250;\n",
+"alpha=20*%pi/180;\n",
+"W=400;\n",
+"sigyt=400;\n",
+"sigut=500;\n",
+"Kb=1.5;\n",
+"Kt=2;\n",
+"T=W*dA/2;\n",
+"Pt=T/(dB/2);\n",
+"Pr1=W*tan(alpha);\n",
+"Pr2=Pt*tan(alpha);\n",
+"RDH=((W*120)-(Pt*320))/440;\n",
+"RcH=W-RDH-Pt;\n",
+"//RcH=400+65.5-240;\n",
+"McH=0;\n",
+"MAH=RcH*120;\n",
+"MBH=RDH*120;\n",
+"RDV=((Pr1*120)-(Pr2*320))/440;\n",
+"RcV=Pr1-RDV-Pr2;\n",
+"MAV=RcV*120;\n",
+"MBV=RDV*120;\n",
+"Mmax=sqrt((MAH^2)+(MAV^2));\n",
+"T=30*10^3;\n",
+"Ta=0.135*sigut;\n",
+"d=16*sqrt((Kb*Mmax)^2+(Kt*T)^2)/(%pi*Ta);\n",
+"d=d^(1/3);\n",
+"\n",
+"  // printing data in scilab o/p window\n",
+"  printf('d is %0.2f mm    ',d);\n",
+"  "
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 15.3: S3.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"// sum 15-3\n",
+"clc;\n",
+"clear;\n",
+"P=16*746;\n",
+"N=3000;\n",
+"w=2*%pi*N/60;\n",
+"T=P/w*10^3;\n",
+"sigy=400;\n",
+"Ty=sigy/2;\n",
+"FOS=2;\n",
+"Ta=Ty/FOS;\n",
+"d=T*16/(%pi*Ta);\n",
+"d1=d^(1/3);\n",
+"r=3;\n",
+"D=d1+(2*r);\n",
+"SCF=1.196\n",
+"Tys=Ta/SCF;\n",
+"d=T*16/(%pi*Tys);\n",
+"d2=d^(1/3);\n",
+"d=14;\n",
+"D=d+(2*r);\n",
+"\n",
+"  // printing data in scilab o/p window\n",
+"  printf('d1 is %0.2f mm    ',d1);\n",
+"  printf('\n d2 is %0.2f mm    ',d2);\n",
+"  "
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 15.4: S4.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"// sum 15-4\n",
+"clc;\n",
+"clear;\n",
+"P1=24*10^3;\n",
+"P2=10*10^3;\n",
+"sigyt=460;\n",
+"Tya=sigyt*0.3;\n",
+"SCF=2.84;\n",
+"Ta=Tya/SCF;\n",
+"N=400;\n",
+"w=2*%pi*N/60;\n",
+"T1=P1/w;\n",
+"T2=P2/w;\n",
+"d1=T1*16*10^3/(%pi*Ta);\n",
+"d1=d1^(1/3);\n",
+"d2=T2*16*10^3/(%pi*Ta);\n",
+"d2=d2^(1/3);\n",
+"theta1=%pi/3600;\n",
+"l1=120;\n",
+"G=84*10^3;\n",
+"d3=T1*10^3*l1*32/(%pi*G*theta1);\n",
+"d3=d3^(1/4);\n",
+"d4=T2*l1*10^3*32/(%pi*G*theta1);\n",
+"d4=d4^(1/4);\n",
+"\n",
+"  // printing data in scilab o/p window\n",
+"  printf('d1 is %0.2f mm    ',d1);\n",
+"  printf('\n d2 is %0.2f mm    ',d2);\n",
+"  printf('\n d3 is %0.1f mm    ',d3);\n",
+"  printf('\n d4 is %0.2f mm    ',d4);"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 15.5: S5.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"// sum 15-5\n",
+"clc;\n",
+"clear;\n",
+"d=200;\n",
+"r=d/2;\n",
+"N=300;\n",
+"P=5000;\n",
+"D=500;\n",
+"R=D/2;\n",
+"u=0.3;\n",
+"E=205*10^3;\n",
+"G=84*10^3;\n",
+"Ta=60;\n",
+"Kb=1.5;\n",
+"Kt=2;\n",
+"w=2*%pi*N/60;\n",
+"beta1=20*%pi/180;\n",
+"V=r*w;\n",
+"v=R*w;\n",
+"// Let T1-T2 =T\n",
+"T=P/V;\n",
+"x=u*%pi/sin(beta1);\n",
+"T2=T/((exp(x)-1));\n",
+"T1=T2*exp(x);\n",
+"t=P/v;\n",
+"y=u*%pi;\n",
+"T3=t/((exp(x)-1));\n",
+"T4=T3*exp(x);\n",
+"T=P/w;\n",
+"Rc=2612;;\n",
+"RA=645.1;\n",
+"MB=96.76;\n",
+"MC=-208.96;\n",
+"d=16*10^3*sqrt((Kb*MC)^2+(Kt*T)^2)/(%pi*Ta);\n",
+"d=d^(1/3);\n",
+"l=380;\n",
+"J=%pi*d^4/32;\n",
+"theta=T*10^3*l/(G*J);\n",
+"theta=theta*180/%pi;\n",
+"\n",
+"  // printing data in scilab o/p window\n",
+"  printf('d is %0.1f mm    ',d);\n",
+"  printf('\n theta is %0.2f deg    ',theta);"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 15.6: S6.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"// sum 15-6\n",
+"clc;\n",
+"clear;\n",
+"T=400;\n",
+"Pt=4800;\n",
+"Pg=3600;\n",
+"sigyt=360;\n",
+"E=205*10^3;\n",
+"G=80*10^3;\n",
+"Kb=2;\n",
+"Kt=1.5;\n",
+"FOS=3;\n",
+"RC=((Pt*90)+(Pg*200))/140;\n",
+"RA=8400-RC;\n",
+"MB=RA*0.9;\n",
+"MC=Pg*0.045;\n",
+"Te=sqrt((Kb*MC)^2+(Kt*T)^2);\n",
+"Ta=0.577*sigyt/FOS;\n",
+"d=16*10^3*Te/(%pi*Ta);\n",
+"d=d^(1/3);\n",
+"L=110;\n",
+"J=%pi*d^4/32;\n",
+"T=400;\n",
+"theta=T*10^3*L/(G*J);\n",
+"theta=theta*180/%pi;\n",
+"\n",
+"  // printing data in scilab o/p window\n",
+"  printf('d is %0.0f mm    ',d);\n",
+"  printf('\n theta is %0.4f deg    ',theta);"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 15.7: S7.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"// sum 15-7\n",
+"clc;\n",
+"clear;\n",
+"T=47*10^3;\n",
+"M=32*10^3;\n",
+"d=20;\n",
+"siga=32*M/(%pi*d^3);\n",
+"Tm=16*T/(%pi*d^3);\n",
+"sige=75;\n",
+"Tys=165;\n",
+"n=1/sqrt((siga/sige)^2+(Tm/Tys)^2);\n",
+"\n",
+"  // printing data in scilab o/p window\n",
+"  printf('n is %0.2f     ',n);\n",
+"  "
+   ]
+   }
+],
+"metadata": {
+		  "kernelspec": {
+		   "display_name": "Scilab",
+		   "language": "scilab",
+		   "name": "scilab"
+		  },
+		  "language_info": {
+		   "file_extension": ".sce",
+		   "help_links": [
+			{
+			 "text": "MetaKernel Magics",
+			 "url": "https://github.com/calysto/metakernel/blob/master/metakernel/magics/README.md"
+			}
+		   ],
+		   "mimetype": "text/x-octave",
+		   "name": "scilab",
+		   "version": "0.7.1"
+		  }
+		 },
+		 "nbformat": 4,
+		 "nbformat_minor": 0
+}