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Turntable - Scratchbuilding. - More Practical Help - Your Model Railway Club
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 Posted: Wed Jul 28th, 2021 11:09 am
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Passed Driver
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Hi All.     While awaiting the postie, to bring essential parts,  I have been watching YouTube videos. There was this modeller that built himself a turntable, no mention of DCC or DC, well anyhow the electric contacts were strange, but, he drove the Loco on to the turntable, operated the turntable by hand, that would be my intention. But, then he drove the Loco onto the runround,  That is the subject of my question, how does the wiring work? that allows the Loco to travel in the chosen direction.   Best wishes Kevin 



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 Posted: Thu Jul 29th, 2021 10:44 am
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Hi Kevin,
This is an out of scale drawing to show the table on which the loco is turned and the power ring around the bottom of the turntable.  The GAPS in the outer ring are exaggerated as well as the under sized table and MUST be 180 degrees apart.  The EL shape is schematically showing the wiper and wire to the rail.  

As the table is rotated, the polarity to the rails is changed "automatically" by the rotation which  is shown with the upside down L  and  R  on the right diagram.  

The trick with the turntable is the placement of the electrified power rails and the position of the insulators which as a general rule if you have multiple roads on your round house should be in the middle of the in/out road to your engine shed area.

Hope that this is concise enough for you to follow

Regards

Trevor 




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 Posted: Thu Jul 29th, 2021 01:15 pm
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Hi Trevor.  Thank you for your reply. I will have a go at that, it will be either be a total success or a screwup. All I require now Is a lot of faith.  Best wishes Kevin



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 Posted: Thu Jul 29th, 2021 01:23 pm
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xdford
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HI Kevin,
If you do not feel comfortable making a ring, you could make a printed circuit board just wider than the turntable radius in the centre, put a small wiper on each side of the TT Bridge making sure that you cut a gap that aligns with the centre of your inroad... something I have been meaning to do for myself actually when I stop writing replies to other people, assisting with magazines,  tending to domestic duties and sleeping between 3 and 5am in the morning... I only need another 40 hours or so in a day!

Cheers

Trevor

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