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Sharing some project planning phase: A (digital) ELECTRO-MECHANICAL Network
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RJSV:
Wow, nice:
   Enter the ' PROXY GEAR '.

   I remember, recently saw that great, mechanical computer video, featuring a ' Range fire Computer '.
That, would track an early airplane, effectively 'doing' calculus, for the tracking, using RADAR input feed ...

   Well,... anyway, this ' Proxy' whatever, it's really a;
   1)  ' Proxy Motor ', as it runs, almost exactly, to the tooth, in step with the 'real' motor, the one in the next switch box (or station).
   2) well, uh, it's not.
      It's really a PROXY of a VIRTUAL MOTOR.   Er...
   3). How about: it's a virtual motor, a 'Proxy Gear', and it's a proxy for another 'virtual motor'.
(or gear-train).

   Plus, it's looking like it is possible to make a 'self-extinguishing' switch, using the features in a virtual motor right there, to basically indicate the 200 to 400 milli-Seconds it takes, normally, to fully switch, thus start to an 'overflow'.
   Yup, extremely valuable and simple, for timing, which is actually more literally 'sequencing', at whatever timing it took.  Just being carefully, to match gear tooth counts, for the 'Proxy' right there.
RJSV:
   It sounds cryptic, but that's the input face, including the 'L in' or local motor input signal.  That is responsible for setting the 'B' switch (TAP).  (See photo).
   Let's start with that: The switch section #16 is sending, activating the next box, Station #17.
   Now that we can focus, on Box #17, we can send as needed, the custom stuff, (custom rotary output from Channel 'C').  Then, when it's time to move on, to Box #18, Channel 'B' can activate the Channel 'A' TAP Switch.
   Notice that any switching activity does not involve switching to an already active shaft, 'A', 'B', or 'C'.  That's called 'DRY SWITCHED'.
RJSV:
Here is a related photo, showing the 'footprint', for the 4- Shaft mechanical BUS.
RJSV:
   It was too tempting to use this (Photo), as that's a lot of work.  The main shape, essentially after a 'Y' shaped path switch, gives a 'form' of sorts: outlining where new components can best fit.  In this case, picture shows the 'B' column variations don't use any of the 'right side' gears, for connect by the moving tip gear. So that space becomes the (empty) place of interest.
With the 'A' switch to the right (next sheet), the intermediate shaft can fit, to the right of the 'B' partition, where it sits, in the (output) 'Footprint', as discussed.
   Up to, notice no 'motor' features, just 'reads' the turning there, of the 'B' Shaft into that commutation toggle.  The 'Overflow', by the way, is best if located around, (including the double riding gears, the TIP, and the PIVOT gears), plus the little driver wheel.
All very detailed and messy...AND boring I'd bet, not for me tho....
RJSV:
   Folks; SORRY, I made major mistake, but easy to remedy...
...But first, a brief look at the layout / locating of the 'LOCAL' output shaft:
The diagram showing simple shaft connects, only local as one box, only to the next switch box.
For layout, that 'L' or Local shaft, in the 'footprint' of the input face, should simply be spaced a decent amount, from the 'A' shaft, and 'B' shaft.
So, half way between, and that same distance (down) makes for equilateral triangle.
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