We have been doing some further thinking on the girder bridge and dcided that we needed to rethink our approach.
Some early prints of a curved viaduct, using the new Prusa 3D printer look to be promising. Even more so when the height of the viaduct differs from the baseboard height by a few millimeter. An initial plan of the viaduct footprint looks to be workable. An initial problem with the first layer of the printed arch has now been resolved.
It looks as though the viaduct will have seven arches and potentially half arches at each end.
Some 4mm and 7mm 3D printed railings were examined and are likely to appear on the Purleigh layout (4mm scale) and on Dockland (7mm scale). The railings have been printed using a thermoplastic called PLA. Some other materials are going to be investigated including PET-G, Carbon PET-G, Nylon and a high temperature PLA. These may result in a more robust build.
The servos have been reinstalled on the East board and on the East side of the fiddle yard. All have been tested and adjusted.
3D printing has also been used to produce a replacement mimic panel for the station board. The lights and switches are soldered onto a stripboard. Now all that needs to be done is to wire the stripboard to the 25 way D connector – any volunteers?
Ray has now completed the wiring of the track sections that will effect the transfer of a train ffrom the inner track to the station loop. The next step is setting up the electronic control such that when the points are changed, the station passing loop is fed the appropriate power.
Richard has started on the second platform which has temporarily resulted in what looks like a modern art installation on top of the first platform.