The operating button, when pressed briefly will activate a solenoid that moves the idexing lock, out of the slot thus releasing the vertical axle and allowing it to rotate. It also switches on the motor by means of a micro-switch. When the button is released, the sprung indexing lock slides back to the outer face of the indexing wheel where it remains, keeping the motor switched on until the next slot in the wheel is reached. When this happens the lock, having tapered sides slips back into the slot, switching off the motor and centralising the wheel in precisely the same position each time.
Where the operator wishes to pass a position, the button is kept down and only released when approaching the desired location. There is a direction switch on the control box to allow the direction of rotation to be set. There is also an adjustment for setting the desired rotation speed. Older turntables were turned by 2 men pushing on levers at each end. Their walking speed is unlikely to have averaged more than 2 mph or 3 feet per second. For a 65ft turntable this would take about 68 seconds for a full revolution, which seems faster than one might think. Powered turntables might be a bit quicker. I am ready to be corrected on these figures !
Whilst the turntable has a self contained control box, it may be connected up to a DCC system using a locomotive decoder. But in stand alone mode, a power supply of about 19 volts is required. This may be supplied by either a computer type transformer (19 volts) or by 3 no. 9 volt batteries (PP3) for which 'battery snaps' at about 30p each will provide a good connection to each battery. As use is quite intermittant such batteries will have a long life. A second remote pushbutton may be connected in parallel to provide an alternative location.
Installation of the turntable is best done by means of either a pair of aluminium angles (12 x 1mm equal) bolted to the top of the spacer studs provided. These can be supported beneath the 'pit' from blocks on the underside of the baseboard. In the event that the unit needs to be removed then it can dropped down complete with the supporting angles.