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60ft Turntable Construction - 8


Focalplane

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The wheel frame assemblies are basically complete, other than tidying up and attaching feed wires for electrical continuity.

 

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A few comments.

 

Mainly a result of me not reading the instructions properly, I failed to note that the M1 bolts attaching the insulating plates to the assembly should be countersunk. By the time I had installed the plates I decided not to disassemble them but ground down the cheesehead bolts instead. Strips of electrical tape will be added to provide good insulation.

 

Should I ever build a second turntable (quite why I am not sure) I would probably learn a lot from reading these notes. Build time would be quicker and easier - so much for experience and on the job training!

 

The turntable will be DCC controlled so a couple of departures from the instructions are now required. The first will be to wire one bridge rail to the central spindle and the other to both sets of wheels. In addition a Digitrax reverser will be wired into the bridge so that shorts will not occur. The reverser essentially detects a short as a loco crosses from track to bridge (or v.v.) and immediately switches polarity. The DCC chip will be a TCS M1 I happen to have; this is a bit of an overkill decoder but it has excellent back EMF control which should give good slow motion control. There will be no indexing as I am not using a stepping motor.

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