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So that's a joint for the tentacle leg, that has three degrees of freedom (correct me if I'm wrong) and can move around for something close to 180 degrees. All is well in theory. That sphere in the center was supposed to be a ball joint, but today while looking for parts I found out that ball joints can't do full 180 (yeah, what was I thinking), only something like 65 degrees. And I just don't see any other way how to make it work. What are your thoughts on this?
Not true, my shoulder/arm ball in socket joint can move like 290+ degrees. It can do this because there is flesh holding it in place so that it doesn't fall out. Just find a flexible way to hold the ball in.
For advanced reference, new scientist wrote an article about a robot octopus tentacle that is being developed http://www.newscientist.com/article/mg20127006.500-robot-octopus-will-go-where-no-sub-has-gone-before.htmlbasically its electrocative segments that expand or contract due to electrical imulses causing a system similar to realistic muscular tentacles.I hope the link above leads you to a better design
Also have you looked at weight consideration? after you connect 5 of these segments together than will the first servos be able to hold the rest of the tentacle? I mean that if each segment has 3 servos than that is equal to 4 x 3 servos plus 1 servo supporting the weight of its corresponding 2. meaning that fo 5 segments, 1 servo will have to bear the weight of 14 servo's before you even look at other materials....I hope the link above leads you to a better design