Sunday, May 12, 2013

Week TechVideo, 2013 #19 - Yet another LEGO humanoid arm

From time to time we get to see a new attempt for a prosthetic hand, arm or both, made with LEGO Technic parts, by some addict fan.
Fortunately all these attempts are very different from each other, and pointing to different solutions and directions. Some are fully based on pneumatics, others fully geared or even robotized with LEGO MINDSTORMS, but all very ingenious [1, 2, 3, 4, 5].

This week Peter (piotrek839), a LUGPol member, showed on EB his proposal - a 1:1 scale, fully motorized prosthetic hand, wrist, arm and elbow, with 12 PF motors.



You can find a load of additional photos from this project at Peter's respective folder on Brickshelf.

There you'll see many of the technical solutions he used and the prior studies still in CAD renders.
One of the solutions I most liked was the sliding axles with consecutive gears to implement a kind of extensible axles, and the use of soft axles to transmit rotation to the mLAs at each finger, as they adopt variable positions. This solution must somehow limit the usable torque, but still within the required range.


Disclaimer:

Please avoid sending requests to post specific models on this TBs section.

We understand some of you would enjoy to see your creations featured here, but please understand that because only one video gets highlighted per week, it is impossible to accommodate all the great MOCs continuously build by the Technic builders out there. They simply won't fit all and that's also not the purpose of this blog (see the header statement).

Many of your MOCs are scanned anyway and listed for later publication when they do not fit immediately. However some remain in the backlog queue just for too long and eventually loose the relevance or the publication opportunity window. As a rule of thumb, we also avoid publishing MOCs that have been featured by their authors or other fans at some other great web places dedicated to the Technic community out there. It doesn't mean that occasionally some won't get published here anyway.


Thanks for your understanding!

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