How to design a spur gear in solidworks?

How to design a spur gear in solidworks?

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You can download this model: http://www.thingiverse.com/thing:8077. It's a gear made with Solidworks with a Design Table. Edit the number of teeth and the module to make any gear you need. I make all my gears this way.

 
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Another solution is the site http://hessmer.org/gears/InvoluteSpurGearBuilder.html. It can generate internal/external gears and racks. It works with circular pitch instead of module, and generates DXF files with profiles that you can import and extrude in SW. I used it to make this model: Rack-Gear Coupling.

 
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