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Azimov--
What Sea-to-Sky has not told us, I think, is that the gear sets are free to turn on the shafts. If I am correct in my assessment of his arrangement, then he achieves a good gear reduction at the end, much like the gear arrangement in the ZZSE servo.
What is not clear in my mind is the output gears. It appears that he has two small pinion gears turning eachother, which would mean the outputs to front/back and back/front, as he labels them, would be in opposite directions.
If I were building this gear box, I'd fasten or bond the final gear to the shaft (permitting the other two gears to spin freely on that shaft) and use the shaft as the output in both directions. To couple the output to small pinion gears, as he does, in part defeats the gear reduction.
Does any of this make sense?
Chilli
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