These pictures show a motor and a proposed design for a coupling.  
The design is being discussed on RCM under the thread "Ideas on 
a motor coupling?"  Any ideas are welcome.

The picture "Motorbig.jpg" has a 12" ruler for scale and shows 
the entire motor.  

The picture "Motordetail.jpg" shows a closeup of the gear being 
connected to.  The image "motorcouplingdrawing.jpg" shows a drawing 
sheet of a proposed coupling.  

The file "motorcouplingdrawing.dwg" is the same drawing in the 
AutoCad/Autodesk Inventor file format.