Jose Garcia | Mechanical Engineering

Their are 30 parts total that make up the prosthetic finger.

     6 parts total are 3D printed

          4 parts make up the finger

          2 parts make up the housing

     7 parts are going to be machined

          Their will be 3 pins for the finger joints

          1 pin will be for the housing/spiral bevel gear

          1 bushing will be made for the servo/spiral bevel gear

          2 crimping tools will be made for the steel wire

     17 parts will be ordered

          4 screws

          2 spiral bevel gears

          1 steel wire

          1 servo

          1 arduino

          4 rubber bands

          4 batteries

 

         The 3D printed parts will be made out of ABS plastic, while the machined parts will be made out of aluminum. Both materials will have high tolerances. The 4 finger parts and 3 pins are going to be pressfit. The finger will have the 4 rubber bands going through a track on the top of the finger to give it the right amount of tension needed to keep it straight. While of the bottom of the finger their is a track for the steel wire that leads into the housing. One part of the steel wire will be anchored at the center of the pointer finger and the other end will be attached to the pin connected to the spiral bevel gear. Once the gear rotates it will contract and extend the finger. The gear is meshed with the second spiral bevel gear, which then the gear is connected to the servo, which is connected to the arduino, which is powered by the batteries. The arduino will be coded properly so it can tell the system to move properly. Also the screws will hold the housing together.