For reference this is what I am trying to make. Overhead gantry crane showing the motorised cradle that runs along the girder and the winch. The 'festoon' is the arrangement that allows the electricity cable to bepulled out as the cradle moves. Rather like curtain rings on a curtain pole.
|I see yellow paint in my immediate future
|Festoon system assembled to the main crane gantry.
|Overhead view of the gantry and festoon system
|Detail of the gantry cradle with the built in winch and motor
The cradle and winch are scratch built from sheet and tube styrene and a couple of wheels from model kits. It can't be assembled until last as it need to be glued in place to the girder.
I'm just off to spray some yellow paint.