How to make a spur gear using AutoCAD

You can make a spur gear using AutoCAD following this simple tutorial Step 1: Lunch AutoCAD.

• Step 2: Draw 2 circles of 50mm radius and 35mm radius respectively To draw circle in the command line type circle, or c and press enter Choose r for radius and enter 50 for the first circle repeat again for the second circle.

 • Step 3: Make the gear tooth spaces profile

. • Step 4: Trim the circles side ways.

 • Step 5 Now enter "bo" command. It will show the boundary creation dialogue. Click Pick point. This command is going to be used for creating the polyline.

 • Step 6: Click inside the region and then press enter.

 • Step 7 Now we have the polyline created. Remember bo command doesn't join the lines but creates a polyline bounded by a region. Therefore the lines and arcs are also there.

 • Step 8 Make a circle of 50mm radius.

 • Step 9 Extrude it by 15mm.

 • Step 10 Now extrude the tooth polyline by 25mm.

 • Step 11 Array>>polar array>> and select the tooth profile extruded to array and the center point be origin and no. of items let be 12. Click OK

 • Step 12 Now subtract the tooth profile arrayed from the cylinderical disc and we have the gear body.