I didn’t recall anyone else posting about this but for the VersaPlanetary gearbox, how do you know how much is too much torque for a dual motor input? I was looking to put two 775s through a VersaPlanetary geared pretty low, but the Load Rating chart doesn’t mention anything about dual input. Would the max gearing down be the lowest possible divided 2 since there is 2x more torque?
Peak torque from 2 775 pro’s is pretty close to peak torque from a mini-cim, so the mini-cim load chart should be a decent place to start. I’m sure Vex could provide a better recommendation if you contact them.
contact VEX tech support. They will respond quickly
Contact Vex support for a real answer, PLEASE. But here’s my mostly uninformed, unqualified hunch you can use at your own risk.
The typical failure mode of most VPs is the output shaft, except for the 10:1 stage which can fail at the carrier plate. This is why a 2 stage 100:1 gearbox is less strong than a 3 stage 100:1 gearbox. This basically means as long as the final stage of the gearbox isn’t 10:1, you’re failing the gearbox because the output shaft is transmitting more torque than it can handle.
With that information, I think you can safely make that assumption - you can safely use up to 1/2 of the max safe reduction allowed for a single 775pro. Just be sure any 10:1 stages involved in the gearbox are used as the first reduction and not the last. Your mileage may vary, take this advice at your own risk, etc.