Posted February 13, 20214 yr Here's my 3 speed automatic gearbox using a servo motor to drive the gear change mechanism. The servo motor is activated by an electric switch which in turn is driven by a torque detector using a differential at the output. The automatic gearbox will switch to a lower gears automatically as load is detected on the output of the gearbox allowing it to generate more torque to overcome the load.
February 13, 20214 yr Good work! Before switching my automatic gearbox strategy to PU programming, I ambitiously tried a similar project to make an 8-speed automatic, in which the servo motor would operate a "paddle shift" sort of mechanism, requiring a return to center cycle, also controlled by a switch. My design was much more complicated though, and didn't work at all, unlike your much more reliable design!
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