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The Ada hand has limited mobility for grasping objects, particularly when used as an end-effector to a system that does not have a wrist.
To make a powered wrist for the Ada hand capable of getting into the correct position to best grasp a variety of objects.
1. The solution must give the hand flexion, extension, adduction, abduction, supination and pronation (standard 3DOF wrist movements).
- Different hand positioning is required to grasp different objects, without all of these movements, the hand wouldn't be able to get into position for some objects.
- The Ada hand needs to be simple to control so it can be used by a lot of people.
- If it's to fit onto an existing arm, it must be as small as possible so as not to elongate the arm unaturally.
Develop a 3DOF wrist to connect the Ada hand to. Use the control output pins from the Almond PCB to control the wrist motors (which would need their own circuitry). You could look at a few different wrist configurations, such as a stewart platform or a gimbal arrangement. Motor selection will be key, and stepper motors, brushless and brushed DC should be considered. The wrist will need to take a very large load but will not necessarily need to have a lot of force and as such a clutch type mechanism to move load off the motor gearbox onto might be worth considering.