How much torque?
As far as I know, Babbage never discussed how much torque he expected would be needed to rotate the various shafts with gears. My prototype mill section wasn't functioning well because the answer for me was "too much". Consider giving off a number from the A register digit stack to the anticipating carriage. The gear train goes from the digit wheel, to the long pinion connector, to the fixed long pinion, perhaps to the reversing gear (depending on whether it is for addition or subtraction), to the carriage connector, and finally to the anticipating carriage digit wheel. So there are either 5 or 6 gears in series. The torque required to turn the A register stack finger shaft is a combination of: rotational friction of all the vertical shafts friction from meshing of the gear teeth at all the interfaces spring tension holding the the weak locks on the anticipating carriage friction at the interface between the carriage wheel point and the carry warning arms rotational fri...