1. Create a new image in Photoshop the size you want it. (I used 800 x 800)
  2. Find the center of the document (Go to the View Menu -> New Guide put a guide at 50% vertical, you will have to do this again to put a guide at 50% horizontal)
  3. Using your ellipse tool with Paths selected not Shape Layers draw a circle from the center hold down alt and shift (This will be the outside of your gear)
  4. Now again from the center use your Rectangle tool this time only hold alt draw a rectangle a little taller then your circle this will be a tooth on the gear.
  5. Using your path selection tool select the rectangle you just created
  6. Go to your actions palette and click create new action give it a name.
  7. Hit control C then Control V (This copied and pasted your rectangle)
  8. Hit control T to transform the angle of you rectangle ( I entered 20 degrees)
  9. Hit enter twice once to accept the degree value one to accept the transformation
  10. Stop recording your action
  11. Click the play button in your actions palette until you have rectangles all around your circle.
  12. Next select all the paths you have created and click your subtract from shape area button and then click combine.
  13. Next draw a small circle on the inside of your gear using your ellipse toll and holding down alt and shift.
  14. Next using your Path selection tool select both paths click on exclude overlapping shape areas and click combine.
  15. Next click on new layer in your layers palette we will working on coloring the gear.
  16. Next in this new layer create yourself a gradient I used a horizontal gradient from black to grey.
  17. Next add the filter “Add Noise” set it to monochromatic and increase the amount I used 40
  18. Next add the filter “Motion Blur” adjust the values I used 35 for angle and 135 for distance.
  19. Next go to you paths palette and click load path as selection.
  20. Go back to your layers palette and make sure your gradient layer is selected and hit control J
  21. Delete your original gradient layer.
  22. Add bevel and emboss to your gear layer.
  23. Next hold down alt and click your up arrow you now have a 3d gear.
  24. Dress it up how you would like and enjoy.