Joint Configurations of Industrial Robots

Below are photographs of the joint configurations of 6 axis robots, varying by rated payload. 

Low Payload Examples (Low Payload is Comp Relevant)


High Payload Examples


General 6-Axis Configuration

All industrial 6 axis arms (that I've looked at) follow the SLURBT joint setup, obviously with some variations in linkage length, likely due to differently defined workspaces


Brief Notes on Axis 2

Did only brief research, but it seems like thrust bearings are sauced onto a flange to hold the axial load of the arm on axis 2