Robotic Hand
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Published on April 20, 2010
This thing was Featured on April 20, 2010
Description
I would like to create this using a 3d printer. Dental rubber bands for braces act as tendons and hold the hand in a rigid state. When strings are pulled corresponding joints will fold, making the fingers open and close. I plan to have servo motors pull and release the strings.
**Here is a video of an earlier revision:**
youtube.com/watch?v=fKrzORMTyOE
**A crude prototype of the concept made from tubing, rubberbands, and zip ties:**
youtube.com/watch?v=_mID_RQ7qIs
**Testing of the "controller" glove. Only a single flex sensor installed:**
youtube.com/watch?v=OmnV2m10Eyk
**Original inspiration for this project is from:**
sciencetoymaker.org/robothand/assembl.html
**Video of the Printed Robot Hand in action:**
youtube.com/watch?v=WPuke73UgL4
**Flickr Set:**
flic.kr/s/aHsjvC1JYr
**Here is a video of an earlier revision:**
youtube.com/watch?v=fKrzORMTyOE
**A crude prototype of the concept made from tubing, rubberbands, and zip ties:**
youtube.com/watch?v=_mID_RQ7qIs
**Testing of the "controller" glove. Only a single flex sensor installed:**
youtube.com/watch?v=OmnV2m10Eyk
**Original inspiration for this project is from:**
sciencetoymaker.org/robothand/assembl.html
**Video of the Printed Robot Hand in action:**
youtube.com/watch?v=WPuke73UgL4
**Flickr Set:**
flic.kr/s/aHsjvC1JYr
Instructions
The model was scaled by a factor of 1.10 to compensate for shrinkage. The thumb base part had to be cut in two pieces to address a design error issue. Loctite blue was used to prevent the screws/hex nuts from falling out. I ran out of metal bearings, so I had to print a temporary replacement part. The "hook" part is used to tether the fishing line to the tip of the finger. Then "ring" is used to ease the model manipulation. Epoxy was used to glue parts and re-enforce weak points.
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Anonymous
on
May 22, 2011
said:
i am about to have this printed and am wondering if you know anymore about the bearings? also could you share a link to the ones that do work? Great model will let you know how it turns out. Here is my email: njkl44@gmail.com
kaijuu
on
February 16, 2011
said:
What size screws and nuts does this need? I'm printing one soon and want to have parts ready when it's done. :D
K9markVI
on
May 3, 2010
said:
Do you have the files for each individual section? Awesome design too! work perfectly with some muscle wire.
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More from embeddedjunkie
This is an excellent design, and it has great potential.
Don't you have an extra digit on the thumb?
Why are you building it from cubes, with 3D printing you can make nice and round finger tips. That would be more natural. Is it a modeling restriction?
How many motors are you planning? One for each finger and two for the thumb?
A hand is a tricky thing, the two joints (counting from the tip) operate together, but the third is almost independent (that is a minimum of two motors per finger)