Thingiverse
Parametric Proximal Phalange by orgemd
by Thingiverse
Last crawled date: 4 years, 7 months ago
This is a parametric version of the proximal phalange used for Robohand.
I tried to make a Robohand scaled to adult size, and found a couple of areas I thought could be improved. First, I did not like that all of the fingers were equal in length - very unlike a normal hand. Second, the uniform length was too short - smaller than a pinky finger. Third, there was no ability to control the hole sizes, leading to some problems with holes that were too big or too small. Fourth, there was no ability to control the fit between parts, leading to too much lateral motion in some joints.
This version allows you to tweak the settings to make the fingers custom to your needs. It allows you to set the scale factor to match the other Robohand parts. You can then set the length of the phalange, the size of the holes for the knuckles, the size of the hole for the bungies, the size of the hole for the drive string, and the thickness of the tabs to tune the fit with other parts. There is also a support option to make it a bit easier to get a good print.
I have made a first test print of these - scaled to the actual finger lengths of the person for whom I am making the hand. They appear to work properly, but the hand is not complete and more testing is needed. For that reason, I am going to call this a work in progress for now.
NOTE: I have no medical training whatsoever, and make no warrantee of any sort regarding this part. I am providing it in the hopes that it will be helpful for others. If, however, you intend to use it, seek appropriate medical attention from a trained physician.
I tried to make a Robohand scaled to adult size, and found a couple of areas I thought could be improved. First, I did not like that all of the fingers were equal in length - very unlike a normal hand. Second, the uniform length was too short - smaller than a pinky finger. Third, there was no ability to control the hole sizes, leading to some problems with holes that were too big or too small. Fourth, there was no ability to control the fit between parts, leading to too much lateral motion in some joints.
This version allows you to tweak the settings to make the fingers custom to your needs. It allows you to set the scale factor to match the other Robohand parts. You can then set the length of the phalange, the size of the holes for the knuckles, the size of the hole for the bungies, the size of the hole for the drive string, and the thickness of the tabs to tune the fit with other parts. There is also a support option to make it a bit easier to get a good print.
I have made a first test print of these - scaled to the actual finger lengths of the person for whom I am making the hand. They appear to work properly, but the hand is not complete and more testing is needed. For that reason, I am going to call this a work in progress for now.
NOTE: I have no medical training whatsoever, and make no warrantee of any sort regarding this part. I am providing it in the hopes that it will be helpful for others. If, however, you intend to use it, seek appropriate medical attention from a trained physician.