General > General Technical Chat
Sharing some project planning phase: A (digital) ELECTRO-MECHANICAL Network
RJSV:
Focus on the 'A' column the purpose is to set, pipeline style, the NEXT switch box Station, for transfer function, down the Network line.
Basically, 'A' (local output), will exit this box, in the 'Footprint', representing that shaft (see picture).
Notice, a CW (clock wise) turning of the 'chained' signal ends up again CW, by the end of the 4 gears, as each will invert the signal sense, CW or CCW.
A tough structural item to convey, is the simple bearing and 'head to head' alignment, between two separate shafts: The output here, is using the same footprint location, as the input, although such has geometrical reversal, left to right. (Shaft footprints are, also, continuous thru the switch box interior: thus reversed depending on viewing direction.
RJSV:
One concern is Parasitic Back-Feed, where 2 signals mix, but in ackward fashion, as each separate signal, now together, will 'back-feed' as an unwanted or parasitic signal, that may cause some random harm.
Remember, this is machinery but 'designed' by a Software Expert...(ahem...).
Remedy is easy examination: one case has the parasitic driving, backwards, the 'A' switch TIP Gear.
However, during that time that TIP Gear is un-connected; just flapping in the breeze.
RJSV:
Hard to see, in photo the separation, at 90 mSec, of that TIP Gear, supposing gear teeth are, perhaps, 0.08 "
and so that little movement, for disengage, came out to about 7 degrees, (out of the total 60 degrees travel).
A bit of time is needed, overcome the extra heavy 'grease', but also not much acceleration at end of
travel.
The full diagram would have, at end, a 7 degrees or so of engagement. That might be very short, but not a source of (short) pulse.
RJSV:
Taking a look at how to use a 'PROXY' set-up, each switch box needs to SET the following switch box, meanwhile applying that to also RESET the currently selected switch box.
So, in effect, the swing travel (should) be same, just mirror reversed. But, conveniently, the switch here, in the current box, provides a usable 'substitute', and this the term used: PROXY.
The overflow signal indicates that the typical 300 mSec travel delay, has made contact (that's why you get that rotary 'overflow status' signal.
RJSV:
I would seldom consider using the term 'delightfull', to describe a gear train, but here goes:
Picture shows, (maybe never going to be clear, really)
The gear train runs towards the left, that being the 'A' positioning motor. Two 'alternate' lucky breaks are that a 'backwards' and unwanted signal that 'B' Output sends, as a result of legitimate sending to SET switch 'A', that signal also folds back, a parasitic that goes into the 'B' overflow (output).
However, good news is, that RESET Overflow gear is currently in an unconnected state, (when B output happens, the 'B' switch is, by definition, positioned away from the overflow.
Same good news, for the parasitic signal the other way; When 'A' is being RESET, that signal, from 'B' overflow (while being RESET), will back-feed, to the
'B' local output; but no bother...again, by definition, the 'B' switch will then have been positioned, in the open or RESET condition.
Very confusing, I know! (I had to design that shiii)
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