This robot arm closely resembles the arm that appears in the RIS 2.0 (RCX) set (#3804). But since the NXT set has three motors instead of only two, this design uses independent motors for grabbing and lifting. A third motor is used to rotate on its base. An ultrasonic sensor is mounted on the robot to enable it to see objects.
When I built this robot in January 2007, I probably didn’t quite understand how the original RIS 2.0 robot arm worked. You can see a set of big gears in the middle section of the arm. As it turns out, these are superfluous as long as you lock only one of them to the arm’s middle section. The RCX arm needed the gears to open and close the non-motorized grabber.
It’s funny that when people copy someone else’s design, they also copy the errors. For instance, this robot arm on Youtube has the same superfluous gears. Check out the pictures below to make your own copy.
hey very cool robot i love it and i want to build it. and can you post instructions please? i would love to build it.
anyways very cool
Thanks. All I have for this robot is on this page. If you’re looking for a robot arm with instructions, look for the Snatcher.
We built the entire snatcher arm. It looked really awesome but the programming that the book included, didn’t work.
If you’re asking for help, you’ll have to clarify a bit more on which part you could not get to work.
As you can see on the videos, the program works fine. Let me know if you need any assistance 🙂
Hey Laurens, I’m not sure if you still look at this post, but I was wondering how you got the “L” piece of the grabbing mechanic in between the orange sections of the motor?
where can i get the instructions to this