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@mfgenggear In my design, the hollow shaft tube does not rotate with the sun gear (the sun gear is coupled with the rotor, and the hollow shaft is coupled with the gearbox output). In this case I need to press fit the sun gear to a part rotating with the rotor. Sorry for the confusion

@mfgenggear Thanks for your response. Let me clarify some details. As you have pointed out, most sun gears use an internal spline. However in the design that I want to achieve, there is a hollow shaft going through the sun gear (first picture), which means that the sun needs to be coupled on...

Hello all, I am currently designing a hollow shaft actuator using a custom compound planetary gearbox. The issue I am encountering is to find a way to couple the sun gear (15T, mod1) to the rotor, while still having the hollow shaft go through the sun gear. As the actuator is quite thin, the aun...