Besides that, with string the turntable makes a neat yo-yo, too!
"S"tring Bob _________________________________________ --- In [email protected], "Ed" <loize...@...> wrote: > > 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" <meldridge@> 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/
