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I am intrigued as to what motivated you to use your particular elevator drive setup... I can see why a setup with 2 RS775's geared very fast with a pneumatic brake for holding is more 'mechanically ideal', but it seems like similar performance could be attained with a CIM (or two) at higher reliability and with less complexity. Was the elevator speed needed with the weight/CG of the RS775 solution? It doesn't seem like the power draw of a non-braking solution would've been too bad. Am I just standing on the other side of the 'elite powerhouse' line where the difference between an elevator at 5.85fps and one at 3fps is highly significant?
Also, am I correctly understanding the design that the elevator carriages were driven from only the right or left side (i.e., only from the right for the RC-carriage and only from the left side for the tote-carriage)? I see 4 long, vertical belts on each side which would make me think otherwise, but I don't see how the power for each carriage is transmitted to both right and left on the elevator gearbox.
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The goal was to have an elevator fast enough and powerful enough such that we were never waiting on the elevator while stacking. Two RS775s have a greater power to weight ratio even with the additional half pound from the pneumatic brake assembly than one CIM.
The gearbox transmits power to all four corners of each carriage. Its hard to tell from the render but each pair of motors drive two sets of pulleys which transmit power to the left and right side of the elevator.