Second Degree Hand
by orgemd, published
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This is a mechanical hand made for users with a functional thumb. It includes an opening that allows the user to utilize their thumb along with mechanical fingers.
This hand includes a couple of unusual features:
First, this hand allows for two degrees of freedom in the motion. Most similar hands only allow the user to raise or lower the fingers. This one also allows the user to move the fingers side-to-side. A demonstration of the two degrees of freedom can be seen at:
Second, this hand includes springs on the tuners. This resolves some issues so that the hand has dramatically improved grip. A demonstration of this feature can be seen at:
This design is also fully parametric OpenSCAD files. Although there are STL files attached, they are just for example purposes. The intention is that each individual will create their own unique STLs from the SCAD files.
There is currently no option for a mechanical thumb in this design. There are a couple of other hand designs that include a mechanical thumb. If someone really wants a thumb added to this design (maybe because of the two degrees of freedom) I can maybe add it.
I am not marking this one a work in progress. The one I was making for my sister is pretty much complete and working well. I am working on an updated version, but that will likely be a new version 3.
As always... This is provided in the hope that it will be beneficial. It is provided, however, without any warranty of any sort. Use at your own risk, and seek appropriate medical attention. If you do use it, and you experience any problems, immediately discontinue use.
For more information on where to connect with people who can help someone in need with sizing, printing and/or assembly of a mechanical hand please join the e-NABLE Google+ Community entitled, e-NABLE:
For more information and stories:
UPDATE Version 3 7/23/2014
I have preserved all of the old files for anyone who was in progress or prefers the old version. Those are all in the V2 zip file. The new files are all for version 3. Version 3 was mostly tweaks to the original design. Some notable changes are:
- I reduced the number of parts to create the main hand from 7 printed parts to 4 printed parts while improving strength across the board.
- I created an option in the finger files to insert small bearings that make the motion a bit smoother.
- I changed from printed pins or various screw mechanisms to 3mm PLA.
I find the updated version to be much stronger than the previous version and to function more smoothly.
Most of the pictures are still of the previous version. I did, however, include a bunch of pictures that show the new finger joints. I'll try to get some pictures of the overall hand. I know, however, that some are waiting on this version, so I wanted to get it posted.
Save all of the .scad files to the same directory. Customize the OpenSCAD files. I generally increase the number of elements under the Advanced Preferences to about 64000. Most of the parameters related to the hand are in the Include file. The hand and finger files allow you to select which components to print. The gauntlet file has a bunch of options. Printing the parts from the fingers file, the hand file, and the gauntlet file will give you all of the needed printed parts.
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Second Degree Hand by orgemd is licensed under the Creative Commons - Attribution - Share Alike license.
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- You must attribute (give credit) to the creator of this Thing.
- You must distribute Remixes under the same license as the original.
- Remixing or Changing this Thing is allowed.
- Commercial use is allowed.
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