For the fingers I started by placing shelled domes on my hinges. These act as knuckles for the hand. I then placed beveled o rings on the spheres. ...
Have you ever been working on a project and needed an extra hand? I have designed a prototype that will hold, grab, and clamp your projects while leaving your hands free to build and work. The 3rd hand is engineered to grasp almost any object securely with an easy adjustment of the ball jointed fingers and arm extension. The flexible arm is capable of reaching around corners, fitting in cramped places and even working upside down with the aid of a strong suction cup base mount. I believe this prototype is practical and something I would use. Builders and DIY'ers alike should be able to access productive tools such as this. I hope this instructables contest produces great products from inventive minds all around the globe. If you like my design and idea, support my efforts in creating this instructables by commenting, liking, following and voting for my idea. Thanks.
For this first step I took a dome from the primitive shapes category and placed it in the center of the workspace. This represents a suction cup on my prototype. A cylinder was added to the dome/suction cup; I then used the fillet tool to round off the edge in between. Then I added a sphere and filleted the difference between the cylinder and sphere.
Step 2: Designing The Joints
For the joints on the arm of this prototype, I used a shelled out dome with a filleted cylinder connected to another sphere on top. To the base on the dome I added a beveled o ring designed to sit halfway over on the ball joint so it is held in place. I added another o ring to the base to simulate a suction cup.
Step 3: Designing The Arm Extension
For the arm extension, I used the copy and paste tool to reproduce 17 total chrome/black ball and socket links. I stacked and rotated the joints to give the perception of motion and show their flexibility.