Gents...If'n I read Don's original post correctly, it appears he is planning to use DCC for track power. He makes no mention of how he intends to operate/rotate the bridge. It might be with a hand crank, small motor, sophisticated electronics, or even some "S"TRING used to turn a shaft. Michael is correct in that polarity changes need to be considered, but an auto-reverser is not the only solution. A manual DPDT toggle switch will do the job just as well. This manual approach forces the operator to stay alert just like in the real world. And allows for human error, too. With the NYSE turntable control system, polarity reversal is built in. With Bob's string method, it won't matter anyway since the loco-pulling string will get all tangled up in the arch and the loco will not be able to move off the bridge. Hence, never a short circuit. Time for breakfast....Ed L.
--- In [email protected], "Michael" <meldri...@...> wrote: > > If you follow Ed's plan, you will need an auto-reverser of some kind to > switch the polarity of the bridge rails. It might be simpler to cut gaps in > the pit rail and leave dead sections as wide as the wheel sets on the bridge. > > -Michael Eldridge > > --- In [email protected], "Ed" <Loizeaux@> wrote: > > > > Don...One idea is to use the pit rail for one rail and run the other rail > > has a wire from the track to a direct connection with the shaft. Then > > install wipers to rub on the shaft. Thus no short circus or magic smoke at > > the pit rail gaps. My Bowser had brass wheels on the bridge which I > > supplemented with some TOMAR track wipers to keep the pit rail cleaner and > > to provide extra pickup contacts. Good luck...Ed L. > > > Re: Bowser Turntable and DCC Has anyone setup a bowser turntable on DCC? The bridge is powered using 4 wheels that ride on a circle of track in the perimeter of the pit. The circle is broken up into two 180Ë semi-circles with a gap between each arc. The bridge has two wheels to pick up current at each end that are connected to the rails on the bridge. I can see how these would work on DC as no current would be in the rails when the bridge is being moved into position. But, with DCC the current is usually on all of the time. When the wheels from one end of the turntable bridge the gap between the two arcs I think that a dead short will occur. Has anyone tried to use this or a similar turntable using DCC? Don ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/S-Scale/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/S-Scale/join (Yahoo! ID required) <*> To change settings via email: [email protected] [email protected] <*> To unsubscribe from this group, send an email to: [email protected] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
