Originally I received two lower arms instead of one of each. Paul from Florida got two uppers. So we cross shipped them and now we each have a complete set. I also got a restraining bolt in the process. Paul had an extra one and gave me a very good deal on it. Continue reading
First a bit of history
It’s no secret that Apple keeps a tight reign on what they allow developers to do with their hardware. I don’t necessarily disagree with this. But it can be annoying when you want to do something special – like use the computing power of an iPod Touch as the brain for a robot. Because that requires some way to interface the iHardware with all the robot sensors and motor controllers. But my understanding when iOS4 came out was that you could communicate with outside devices via the 30-pin dock connector. Yeah, not exactly.
I want an all aluminum droid. You can build one out of any number of materials (wood, pvc, cardboard, styrene, resin) but none of that is appealing to me at all. But all metal means expensive, it means heavy, it means complicated… and it means waiting… possibly for y-e-a-r-s…
The first thing to know about R2 building is that aluminum parts are built in runs. Some brave builder will find about 40 other people who need the same aluminum part he needs, and will organize a part run. The idea is that no one makes any money doing the run, costs are kept as low as possible, and by doing 40 pieces we all get a lower price. I’ve looked in to doing one off CNC parts and it’s crazy expensive and shops don’t want to touch it. But much of the cost is in the setup, testing, and then turning the machine on to do a bunch of pieces. When doing only one the overhead is too much. All the parts are manufactured to a club spec so they should all fit together. And these days people are doing “diet” parts where they drill away parts of the metal that aren’t seen in order to lower the weight as compared to producing a solid piece of aluminum.