Mechanical Hand

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Project Snapshot

The mechanical hand allows the user to single-handedly extend their reach!


Build the grabbing mechanism, and then customize the grabber's grip so it can pick up a variety of everyday things.

Step 1
Step 1

Step 2
Step 2

Step 8
Step 8

Step 1
Step 1


Click to expand

Tools and Materials

The Engineering Creation Kit has everything you need for this project and many more from STEM Inventions, or get the supplies in bulk:

Tips and Troubleshooting

If the hand doesn't close when the trigger is pulled, then...

  • Move the trigger farther from the handle.

  • Redesign the angle of the "fingertips" so they're steeper. A hand with shallowly-angled fingers is harder to completely close.

If the hand doesn't open up automatically, then...

  • Make sure the rubber bands are pulling the hand into an open position when the trigger isn't being pulled.

  • Make sure there is nothing interfering with the mechanism, such as: loose bits of hot glue, the cable tie tied too tight, or excessive friction at the hinge.

If the trigger is hard to use with one hand, then...

  • Review the video. Notice how the thumb is gripping the top of the thumb rest.

  • Move the trigger closer to the handle to make it easier to grasp and pull, especially for small hands.