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I am in the middle of converting and motorising a Peco N gauge turntable to DCC operation. I am using the standard motorising kit and driving it as a normal locomotive from the controller with a cheap TCS decoder hooked up to the drive motor and the address twenty two. The track on the turntable is fed from a DPDT switch, with centre off, to enable manual reversing of the current flow as the turntable completes a one eighty degree turn. The main problem that I am having with the conversion at the moment is the shaft on the drive gearbox slipping when under load. I am hoping to investigate and rectify that this week when I have more time.

Along with this I am converting the turntable to an over girder type. This has proven to be an awful lot simpler than I expected. The girders are provided by a Peco 00 gauge bridge suitably butchered. The original turntable wheels from the kit have been cut from the under girders, which are relegated to the spares box, and glued directly to the original deck along with I section Plastruct girder lengths. The central steps and hand rails have are courtesy of some model boat gangways which look exactly right or will hopefully will when glued in place after the motorising is sorted. Other than that it is built as per the instructions.
 

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I am not that well versed as far as electrics go and stand to be corrected. But whilst I would agree with you as far as DC current is concerned I am quite certain that for AC operation with DCC then the polarity to the turntable tracks has to switched if it is rotated 180 degrees. Otherwise you would end up with a positive feed rail on the table facing a negative feed rail on the track that you are lining up with.
 

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You were right Sprogman the table does reverse polarity automatically. Which has saved me a bit of wiring. I have got it up and running but it will take quite a bit of fine tuning to get it working smoothly. The problem is that the deck rocks fore and aft preventing vertical alignment with the exit/entry rails. I thought that I had sorted this when fixing it to the table but it now looks as if I will need to put some form of shimming under each end. The only other thing is that it is noisy. Forward is not too bad, but reverse is pretty horrible to listen to even after copious oiling.
 
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