Quote:
Originally Posted by ujiro
But can that really be healthy for the gearbox? It would be like driving in your car and then slamming it into reverse to come to a stop at 100kph.
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Why wouldn't it? Active braking just assists the gearbox in its natural state.
Over-rotation is caused by the motor itself. The piston assembly is so light weight that the kinetic energy it is loading on to the gear train would be minimal at best. Combined with the fact that the NATURAL STATE of the piston is actually FORWARD due to the spring bearing weight on it, its natural state would be assisting the motor, rather than being neutral or negative.
It's one thing for a gearing setup to go in to a full reverse to stop a light piston from traveling rearward when it's naturally trying to go forward. It's another for it to stop a 2000 pound vehicle traveling at 100km/h that has a natural state that has a neutral impact on the geartrain.
With the automobile analogy, if you release power from the motor or geartrain, the vehicle will not immediately stop in its spot nor return to some resting spot. Whereas in a gearbox, if you released the power from the motor (let's say you even manage to completely yank it out of the gearbox at the end of the cycle or during over rotation), the natural state for the piston is still to return forward and stop there - it won't continue to over-rotate.
Again, over rotation is caused by the motor. If you get the motor to stop it, then over-rotation will not occur, especially if the piston is naturally trying to rest forward due to the spring weighing on it.