This hydraulic arm was a homework for my daughter's school. The idea was to create a toy from recycled materials. Hope you enjoy.
Step 1: Materials
- Pieces of cardboard
- 8 syringes
- 1,5 meter hose (aquarium pump)
- 15 Plastic clamps
- 2 screws with 3 washers and 4 nuts
- 1 piece of wire (clothespin)
- 1 wooden stick
- Water, paint, glue, knife, ruler, etc..
Step 2: Planning and Cutting
We made two drawings of what would be the arm and joints. This allowed us to readily quantify the material being used.
After choosing the model that we would use, cut the pieces (not much criterion measurements) as shown in picture.
Step 3: Cutting and Mounting Arm
Step 4: Cutting and Mounting Claw
The gripper is designed to move just one piece. It was more simple.
The "finger" was pasted fixed and mobile was seated on a shaft made with a piece of wooden stick that had a piece of cardboard cut in a circle glued on top so as not to leave the place.
Step 5: Cutting and Mounting Base
The base was made from two pieces of cardboard in order to support arm and accommodate syringes in the same set.
The movable part has two holes:
- One in the center (to be able to rotate the base)
- The other end (to link the syringe and allow movement)
The syringe was attached to another piece of cardboard to keep the same level of mobile base.
After verifying the limits of movement, we fix the syringe with the clamps.
Step 6: Putting it all together
After created the arm, claw and base pieces together to test out the movements and check if everything is working properly. Once assembled, we found that the syringe clamp was not well positioned. We cut a piece of cardboard to attach the syringe to another position, as shown in figure.
Step 7: Painting
After completing the check and corrected minor errors, disassembled the arm as far as giving and paint. After the paint dries, put together definitely.