Here's a little project I'm working on in my free time.

Demo Video

https://www.youtube.com/watch?v=xV4CKzHrJf8

Im trying to create a huge mechanical city which is powered by water, wind, sun and geothermal energy.

Gearsystem Control in Blender: 

Gear 64 is the gear which drive the gearsystem (I selected it). Rotate this gear around the z-axis to move the other geras.Every gear has a transformation constraint which gets and calculates the rotation from gear 64.

Feel free to use this for you own projects :)

Available formats:

Native:

Blender (.blend)

Exchange:

Blender(.blend) (2 files)

Autodesk FBX(.fbx) (19 files)

Marmoset Toolbag (.tbscene, .tbmat)

X3D(.x3d) (18 files)

3D Studio(.3ds) (18 files)

Collada(.dae) (18 files)

Agisoft Photoscan(.ply) (18 files)

Stereolithography(.stl) (18 files)

VRML(.wrl, .wrz) (18 files)

OBJ(.obj, .mtl) (18 files)

Alembic(.abc) (18 files)

DirectX(.X) (18 files)

DXF(.dxf) (12 files)

More 3d-model details:

Animated Yes

Rigged Yes

VR / AR / Low-poly Yes

PBR No

Geometry -

Polygons 100,560

Vertices 112,297

Textures No

Materials Yes

UV Mapping No

Unwrapped UVs Unknown

Plugins used No