Tuesday, August 17, 2021

A STEM Project: A Hand That Moves

Using Vellum and chipboard paper, I created a hand whose fingers move.  Vellum is a flexible paper, I created a cut-out pattern which allows the fingers to move consistent with the way normal fingers move.  I inserted a string looped around a small brad (fastener) in each finger.  When all of the strings are pulled in unison, the finger curls upward.

A hand that moves when the strings are pulled.  

The strings in this paper hand act like tendons.  In the human hand, the tendons are connected to the bone. When they are contracted, this causes the normal movement of the human hand.

Video of the strings in the hand being pulled.


Here is the PDF. I used vellum and Silhouette brand chipboard.

Here is the .Studio file.  

Here is the SVG.


To make the hand, cut out and glue each finger into a tube.  Insert a brad into the tube in the hole at the top of the finger.  Loop a 14 inch string around the brad (in the interior of the tube). Bend the two corners of the finger tip inwards and then splay the brad around the string.  Repeat for all of the fingers.  Glue the fingers to the vellum palm.  Glue the vellum palm to the hand.

Back side of the hand

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