hi,
I would like to build a rubik cube solver like the perhaps wellknown Rubot 1.0.
Ive already selected the brackets and the servogripper assembly, but I was wondering which type of servos Ill need. Ive never used servos before, so Im not familliar with the different kinds of torque.
Will the HS-475HB servos be strong enough for this project, because the HS 645MGs are too expensive if you need 8 of them.
Does anyone has experience with servo`s in robotic arms?
As far as I know (which admittedly isn’t very far), most of the cube-solving robots have been designed with the intent of using a puzzle that’s been modified into a “speed cube”, of the sort that the people use who are solving it for low elapsed times. this apparently involves disassembling the puzzle, and modifying and lubricating it for very little friction or binding of the elements, so that a flick of the finger is all it takes to spin a section.
Such a modified cube would pose very little resistance to a mechanism, and be fairly easy to turn. Even the stiffness presented by a standard, unmodified cube would probably be within the torque envelope of a standard servo, but the key point, at least to my thinking, would be the elimination of binding. Lots of Rubik’s cubes are very stiff, or can “catch” as the elements are rotated, at least until they’re worked in a bit.
I have neither a cube, nor a torque-measuring device available to me at the moment, so I’m afraid that I can’t be of much help as to which servos are best suited for your application. I just figured that I’d mention the “speed cube” aspect though, in case that helps you at all.
Hey, found this on YouTube. Is this the RuBot you were referring to? It’s pretty impressive! (And it uses our SES components, which makes it cooler.) 
I noticed to the left there is a webcam,
maybe for the robot to see the colors on the cube?
