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Adding the falanges

A project log for TNS 1i

The idea is to create an accesible prosthetic hand that is commercially available in Colombia and doesn't use the classic string system.

giovanni-lealGiovanni Leal 09/02/2016 at 17:190 Comments

Now that we have our custom linear actuator made, we have to move something. The thing with the falange is that we have to actuate it from one point and leave it anchored from another. So if we imagine our actuator as our plane of reference, the falange is going to be another plane so if we move a straight line from our LINEAR actuator that passes trough a rotating plane, its going to make a curve at that plane. So we came up with this.

Its not pretty but we were moving forward.


So, putting the anchoring point on the actuator and printing it out we proceed to verify our approach.

We got slow but strong movement so great! However we did change the ratio of the motor reductor to have a finger that opens and closes in about a second, if we need to. At this point we began to think about the finishing of the product, remember that the project only succeeds if we can sell it and give it to people that need it. So we thought about the looks of it, the toughness and the lightness. Yeah everyone mind goes for carbon fiber and that its a Technic that we are not ready for financially and time wise. So the next best thing, carbon fiber PLA filament. Its goooood really good stuff. So the next video is with a new linear actuator (with a bottom part, so we don't have to hold it all the time) and a "carbon fiber PLA" (from now on carbon fiber or CF, we know it is not but you we the idea) falange.

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