Hello, First of all, I thought about different mechanisms while making this design and I decided to make this design. In my design, I wanted a notch on the lower fingers of the prosthetic hand and prepared a suitable mechanism. The working principle of the mechanism is in the form of compression. The middle protrusion allows for varying degrees of movement of the lower fingers into the holes. I made a strong design that is sweatproof, comfortable, and easy to install. I used m30 type screws for bolts, nuts, washers, and m2 screws connecting the lower fingers to the upper fingers.

Hand movement is achieved by placing hooks in slots of varying degrees on the lower fingers.

Edu SOLIDWORKS ARM4ALL Work Showcase​​​​​​​​​​​​​​

Please click to vote for my design: https://arm4all.edu.3ds.com/projects/prosthetic-arm-design/