======DIY Robot Hand ======


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**Materials: **{{$demo.materials_description}}\\
**Difficulty: **{{$demo.difficulty_description}}\\
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**Alternative titles:** Tendon String Hand
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====Summary====                   
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====Procedure====  
  - Trace your hand on cardboard and cut out the shape.  
  - Cut drinking straws into small pieces (about 1 inch each).  
  - Tape the straw pieces onto the cardboard fingers.  
  - Crease the cardboard between straw sections to form joints.  
  - Cut five 12-inch pieces of yarn and tie a bead to the end of each.  
  - Thread each yarn piece through the straws, starting at the fingertips and ending at the palm.  
  - Pull on the strings to curl the fingers, simulating hand movements.



====Links==== 
HOW TO MAKE ROBOTIC HAND | Science Project - Hungry SciANNtist: 
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How To Make Your Own Robot Hand | Cardboard Crafts - TheDadLab: 
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📄 DIY Robot Hand - Science Buff: [[https://www.sciencebuff.org/scienceactivity/diy-robot-hand/]]\\


====Variations====
  * Try using different sizes of straws or yarn to see how finger motion changes.  
  * Create a larger version using poster board for a classroom demonstration.  
  * Attach the strings to a cardboard wrist or forearm extension to make the model more realistic.  




====Safety Precautions====
  * Use scissors carefully when cutting cardboard and straws.




====Questions to Consider====
  * Why don’t fingers have muscles inside them? (They rely on tendons connected to muscles in the forearm.)  
  * What part of the model represents the tendons? (The yarn.)  
  * What happens in your real hand when you let go of a string in the model? (The tendon relaxes and the finger straightens.)  
  * Can you find tendons in other parts of your body? (Yes, such as in the ankle or knee.)