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diff --git a/Machine_Design_by_T_H_Wentzell/12-Spur_Gear_Design_and_Selection.ipynb b/Machine_Design_by_T_H_Wentzell/12-Spur_Gear_Design_and_Selection.ipynb
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+{
+"cells": [
+ {
+		   "cell_type": "markdown",
+	   "metadata": {},
+	   "source": [
+       "# Chapter 12: Spur Gear Design and Selection"
+	   ]
+	},
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.1: Forces_on_Spur_Gear_Teeth.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear;\n",
+"mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-12.1 Page No.254\n');\n",
+"P=5;\n",
+"n=1725;\n",
+"T=63000*P/n;\n",
+"//Pitch circle diameter\n",
+"Np=20;\n",
+"Pd=8;\n",
+"Dp=Np/Pd;\n",
+"mprintf('\n Pitch circle diameter = %f in.',Dp);\n",
+"//Transmitted force\n",
+"Ft=2*T/Dp;\n",
+"mprintf('\n Transmitted force = %f lb.',Ft);\n",
+"//Separating force\n",
+"theta=20*%pi/180;\n",
+"Fn=Ft*tan(theta);\n",
+"mprintf('\n Separating force = %f lb.',Fn);\n",
+"//Maximum force\n",
+"Fr=Ft/cos(theta);\n",
+"mprintf('\n Maximum force = %f lb.',Fr);"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.2: Surface_Speed.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear;\n",
+"mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-12.2 Page No.256\n');\n",
+"//Surface speed\n",
+"Dp=2.5;\n",
+"n=1725;\n",
+"Vm=%pi*Dp*n/12;\n",
+"mprintf('\n Surface speed = %f ft/min.',Vm);"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.3: Strength_of_Gear_Teeth.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear;\n",
+"mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-12.3 Page No.258\n');\n",
+"//Pinion\n",
+"Su=95*10^3;\n",
+"Sn=0.5*Su;\n",
+"Y=0.320;\n",
+"b=1;\n",
+"Pd=8;\n",
+"Fsp=Sn*b*Y/Pd;\n",
+"mprintf('\n Force allowable for pinion = %f lb.',Fsp);\n",
+"//Gear\n",
+"Sn=0.5*88*10^3;\n",
+"Y=0.421;\n",
+"Fsg=Sn*b*Y/Pd;\n",
+"mprintf('\n Force allowable for gear = %f lb.',Fsg);"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.4: Dynamic_Load.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear;\n",
+"mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-12.4 Page No.262\n');\n",
+"//Dynamic load\n",
+"Vm=1129;\n",
+"Ft=146;\n",
+"Fd=(600+Vm)*Ft/600;\n",
+"mprintf('\n Dynamic load = %f lb.',Fd);\n",
+"Fs=1900;\n",
+"Nsf=2;\n",
+"//Comparing to the allowable stress\n",
+"if (Fs/Nsf)>Fd then\n",
+"    mprintf('\n This is an acceptable design.');\n",
+"end"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.5: Calculation_of_Factor_of_Safety_Used_in_Catalog.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear;\n",
+"mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-12.5 Page No.263\n');\n",
+"Su=55*10^3;\n",
+"Sn=0.5*Su;\n",
+"Np=24;\n",
+"Pd=12;\n",
+"Dp=Np/Pd;\n",
+"mprintf('\n Pitch circle diameter = %f in.',Dp);\n",
+"n=1800;\n",
+"Vm=%pi*Dp*n/12;\n",
+"mprintf('\n Surface speed = %f ft/min.',Vm);\n",
+"b=3/4;\n",
+"Y=0.302;\n",
+"Fs=Sn*b*Y/Pd;\n",
+"mprintf('\n Allowable stress = %f lb.',Fs);\n",
+"Fd=Fs;\n",
+"Ft=600*Fd/(600+Vm);\n",
+"mprintf('\n Force transmitted = %f lb.',Ft);\n",
+"T=Ft*Dp/2;\n",
+"P=T*n/63000;\n",
+"mprintf('\n Power transmitted = %f hp.',P);\n",
+"//Compared to catalog\n",
+"hp_catalog=4.14;\n",
+"Nsf=P/hp_catalog;\n",
+"mprintf('\n Safety factor = %f .',Nsf);"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.6: Spur_Gear_Desig.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear;\n",
+"mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-12.6 Page No.266\n');\n",
+"//Miscellaneous properties\n",
+"Np=48;\n",
+"Pd=12;\n",
+"Dp=Np/Pd;\n",
+"Vr=3;\n",
+"Ng=Np*Vr;\n",
+"//Surface speed\n",
+"n=900;\n",
+"Vm=%pi*Dp*n/12;\n",
+"mprintf('\n Surface speed = %f ft/min.',Vm);\n",
+"//Force on teeth\n",
+"hp=2;\n",
+"Ft=33000*hp/Vm;\n",
+"mprintf('\n Force on teeth = %f lb.',Ft);\n",
+"//Dynamic force\n",
+"Fd=(600+Vm)*Ft/600;\n",
+"mprintf('\n Dynamic force = %f lb.',Fd);\n",
+"//Width\n",
+"Su=30*10^3;\n",
+"Sn=0.4*Su;\n",
+"Y=0.344;\n",
+"Nsf=2;\n",
+"b=Fd*Nsf*Pd/(Sn*Y);\n",
+"b=round(b);\n",
+"mprintf('\n Width = %f in.',b);\n",
+"if (8/Pd)<b&b<(12.5/Pd) then\n",
+"    mprintf('\n This is an acceptable design.');\n",
+"end"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.7: Buckingham_Method_of_Gear_Design.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear;\n",
+"mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-12.7 Page No.270\n');\n",
+"Su=95*10^3;\n",
+"Sn=0.5*Su;\n",
+"Np=24;\n",
+"Pd=16;\n",
+"Dp=Np/Pd;\n",
+"//Torque\n",
+"n=3450;\n",
+"P=3;\n",
+"T=P*63000/n;\n",
+"mprintf('\n Torque = %f in-lb.',T);\n",
+"//Force transmitted\n",
+"Ft=2*T/Dp;\n",
+"mprintf('\n Force transmitted = %f lb.',Ft);\n",
+"//Surface speed\n",
+"Vm=%pi*Dp*n/12;\n",
+"mprintf('\n Surface speed = %f ft/min.',Vm);\n",
+"//Force allowable\n",
+"Y=0.337;\n",
+"b=1;\n",
+"Fs=Sn*b*Y/Pd;\n",
+"mprintf('\n Force allowable = %f lb.',Fs);\n",
+"//Dynamic load using Buckingham's equation\n",
+"C=830;\n",
+"Fd=Ft+0.05*Vm*(b*C+Ft)/(0.05*Vm+(b*C+Ft)^0.5);\n",
+"Nsf=1.4;\n",
+"if (Fs/Nsf)>Fd then\n",
+"    mprintf('\n This is a suitable design');\n",
+"end"
+   ]
+   }
+,
+{
+		   "cell_type": "markdown",
+		   "metadata": {},
+		   "source": [
+			"## Example 12.8: Wear_of_Gears.sce"
+		   ]
+		  },
+  {
+"cell_type": "code",
+	   "execution_count": null,
+	   "metadata": {
+	    "collapsed": true
+	   },
+	   "outputs": [],
+"source": [
+"clc;\n",
+"clear;\n",
+"mprintf('MACHINE DESIGN \n Timothy H. Wentzell, P.E. \n EXAMPLE-12.8 Page No.272\n');\n",
+"Ng=42;\n",
+"Np=24;\n",
+"Q=2*Ng/(Ng+Np);\n",
+"Kg=270;\n",
+"Dp=1.5;\n",
+"b=1;\n",
+"Fw=Dp*b*Q*Kg;\n",
+"Fd=699;\n",
+"Nsf=1.2;\n",
+"if (Fw/Nsf)<Fd then\n",
+"    mprintf('\n (Fw/Nsf)<Fd So this would not be suitable design');\n",
+"end\n",
+"//If the surfaces each had a BHN = 450\n",
+"Kg=470;\n",
+"Fw=Dp*b*Q*Kg;\n",
+"if(Fw/Nsf)>Fd then\n",
+"    mprintf('\n\n If the surfaces each had a BHN = 450');\n",
+"    mprintf('\n (Fw/Nsf)>Fd So this would be suitable design.');\n",
+"end"
+   ]
+   }
+],
+"metadata": {
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+		   "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"
+		  }
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+}