Just have another closer look how I did it:
I have the actuators working always between 90˚ and no less than 30˚ to their working lever.
You see that I raised them with the hardwood poles to achieve that.
The one for the shovel has a pole to increase the leverage and torque for the shovel's working angle, currently shown in the upwards position but can be tilted down about 120˚. If I lower the shovel to the ground and then tilt it, it comfortably lifts up the tractor.
The 2 slashers have a lot of torque because they are geared down(which I did not know when I ordered them) and when I lower the rig while they are rotating they will dig into compacted ground, then I drive back and collect the softened soil and move it with the shovel. For mowing lawn they spin a bit too slow but work well if you want to REMOVE the lawn.
600kN is about 60kg, that is not much. So if you have it attached at the middle if the arm, the end of the arm will only lift 30kg(ignoring the weight of the arm) , depending on the angle even less.
Ideally you want to have it when the actuator is half extended at 90˚. That is roughly how I have them for the steering. Both axles are steerable, there is another actuator on the back (right hand side) not visible on the photo.
My actuators are 1000kN so I get at least 40kg force to turn the axle at the wheels, way more than I could produce by hand. Downside of this electrical steering is the that it is slow but as I am steering both axles the response doubles and it is comfortable to drive around normal curves up to 12km/h. If I really have to turn on a plate, I just stop and wait. At some point of the steering radius the power to inner wheels is cut so all power is on the outer wheels in the apex.
It has a password protected ludicrous mode that I haven't dared to try yet. This thing has no suspension. Would have to be on flat preferably tar road that is not available for me.
It is designed to be remote controlled and also autonomous(robotic). Due to other issues I haven't been able to get to that property since 4 months, so that project is on the back bench ATM.
Probably in April ...I'll Be Back !
Edit: I should mention that I am running my 24V Actuators at around 40V. This is more about faster response time for the steering than torque. I would keep them at the rated voltage if merely needed for lifting and use 2 for more torque and redundancy. Mine have a position sensor(10k pot) for the steering comtroller.
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