I wouldn't depend on metal to metal contact to provide proper electrical conductiuvity between layout modules. Modules shrink and expand due to temperature and humidity. This movement will affect current flow and will probably affect loconet signals with DCC systems. Modules should have a plug and socket connection like Cinch Jones or Anderson Power Pole connectors to pass electricity from module to module. In the case of a lift up bridge section the wires from the hinge side should go to the rails on the bridge with another set of wires run out of the way to the other side of the lift up section.
I would suggest that it is much simpler and more robust to feed a swing up bridge from one end with wires, and the other side from a bus running a the wat around to that side.
David
It's like any/every other electrical connection:
If it's done properly with respect to the mechanical and electrical needs of that specific connection in the environment it'll be living in, then it'll be fine. Otherwise, it won't be.
As far as grounding and "signal loss" - If you're using metal benchwork, or constantly-wet wood, or some other conducting substance, then yes, that would be a consideration. Otherwise, it wouldn't be.
Gotta be able to solder your wire to such arrangements, so I suspect most use brass hardware fo some sort, instead of the usual zinc-plated or galvanized hardware.
Mike Lehman
Urbana, IL
Though a new layout is still in the early planning stages, hope is holding on to the dream.
I have seen layouts that appear to have track power routed through a bolt holding two sections of a modular layout or two plates that carry power on contact. I think the most often I have seen it is for a liftout or swing gate of some sort. Is this done frequently? Do you loose some signal strength through grounding?
Just curious.
Thank you,
Richard