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It can be hard to tie off the tendons in the right position. Also, over time the tendons can become loose.
To find a way to adjust the tightness of the tendons after tying them.
1. Must be easily manufacturable using a desktop 3D printer
- So other manufacturing tools aren't required beyond the tools used to make the hand itself
- Any change needs to be an improvement on the current method.
- If the tendon slips or releases at a certain load, grip will be limited to that load.
- Because it has proven to be very strong and durable.
- To allow the solution to be used across all future Open Bionics development and any other collaborative 3D modelling projects.
To design PLA fingernails that slot into the fingertips of the hand, and provide an anchorpoint for the string that also allows it to be tightened.
1. The fingernail should have a concealed loop underneath it onto which the tendon can attach.
2. The fingernail should be FDM printable in PLA plastic.
3. The fingernail should have a feature that enables the tendon to be tightened easily without tools (perhaps by popping it out of the fingertip and rotating it).
4. The fingernail should make the hand assembly process easier.
5. The fingernail should be designed in Blender.
6. The fingernail should be designed keeping in mind that the fingertips may also have silicone pads on them and should be adaptable such that both features can be added simultaneously.
7. The fingernail should work nicely without the tendon slipping off it if you try
1. Perhaps take this on at the same time as the silicone fingertips if you're feeling brave.
2. If designed correctly the nail could have an additional benefit of helping the hand pick up things like cards off a table.
Last Edited By: JonathanRaines Feb 3 16 4:46 PM. Edited 2 times