Turnout operating unit - initial work up.
The baseboards for Maxstoke are of a low profile, so a reasonably discreet unit is required. Eventually the design will incorporate mountings for frog switching microswitches, but this is a trial unit to test the system. Firstly I wanted the unit to be as simple as possible. the points were originally made with my standard moving sleeper tie bar, which has pivoted arms soldered to the switchblades, and a hole in the centre of the tie bar for an operating wire which passes through the baseboard from below.
The TOU has a base, milled from 3mm ABS sheet. this guides a pin guide made from 1.5mm thick fibreglass circuit board cut into 4mm wide strips. A cover plate screwed to the base plate holds the pin guide in place.
The main componants are here. The base plate has 4 holes, one in each corner, to fix the unit to the underside of the trackbed.
This picure shows the pin guide in the baseplate slot.
This shows the assembled unit. The pin is free to slide side to side. You may see a point between the two 10BA screwheads, this is to be drilled and tapped for a pivot screw, about which will be a lever, one end engaging in the guide pin, the other connected to (in my case) a servo motor. space exists for a micro-switch to be mounted on an adjustable plate to switch the frog.
The topside picture shows the TOU base plate orientated with the trackbed. It will of course be fitted below the turnout with the guide pin engaging in the hole discernable in the turnout tie-bar.
A trial with the unit clamped in place has been sucessful, and work will now start on completing the pivot/lever arm whilst await delivery of the servos.