The inspiration for Grumpy began one day when I wanted to build an NXT animal. I began thinking about what kind of animal the robot could imitate. A robot dog? No, it had already been invented. A cobra? No, NXT EV3 will make a cobra model.
Finally, tired of trying to think of an animal, I just started building a pair of jaws around a servo motor. When I looked at the finished jaws, I noticed they were wide. Suddenly, I discovered that an animal-robot doesn't need to resemble a real animal!
Pic 1: Mr. Newton, my new demonstration minifigure, is teaching you to be cautious around moving robots.
Pic 2: A cool view of Grumpy's opened jaws.
Pic 3: I designed Grumpy's jaws similar to Robogator's.
Yes, I ate a churro.
I just had to document it.
Pic 1: My churro is almost done.
Pic 2: After retrieving his legs, Mr. Newton attempts Grand Theft Churro.
Okay, sorry this came after Part 2.5. I posted this once before, but for some reason it was never published and 2.5 appeared (I didn't even think it would get published!)
After building his jaws, I worked on Grumpy's torso. I used beams to attach the jaws to the NXT brain. Then, I worked on the rear driver wheels. This was so complicated that I had to build an entire sub-mini-model to clip them onto the bottom. Finally, I added a tail.
P.S. Moderators, you can reject this if you are still or have just now published the first Part 2.
Pic 1: After escaping Grumpy's jaws, Mr. Newton realizes he left some belongings behind.
Pic 2: The sub-mini-model.
Pic 3: The beams connecting the jaws to the torso.