Quote:
Originally Posted by Scott Kozutsky
Wouldn't it be a 28*29:1 = 812:1 gearbox then? The output 'stage' has 30 pins therefore 29 lobes and the input has one less lobe.
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If it was a normal reduction, yes. But in this case some witchcraft happens where the reduction on the second stage is just "# of pins on the ring gear" instead of "pins-1". I'm not exactly sure why, but I suspect it has to do with the way a planetary gearbox ring gear is exactly 1 less in the gear ratio, only in reverse. After all, in this case we are driving the ring and not the carrier.