how to draw gear

its so simple..:)
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Step 1:
extrude circle and again sketch the front plane with teeth...
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Step 2:
the teeth required is being patterned using axis pattern...and calculated as 360/no.of teeth required
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Step 3:
teeth is obtained and insert option is dragged to top of the model tree
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Step 4:
then extrude the feature surface as sketching plane and draw a oval block
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Step 5:
extrude this up to end of surface and remove material
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Step 6:
pattern with axis
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Step 7:
select surface extrude by drawing a circle and remove material also with internal rounded edge or chamfer
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Step 8:
insert position is dragged and the final product is created(front view)
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Step 9:
back side view