[Zaggo] developed a printable mecanum wheel. These are designed to allow a wheeled vehicle to move in any direction. He uses parts printed with a Makerbot along with commonly available bearings, bolts, washers, and nuts. Download the STL files need for printing and watch the assembly video after the break. We’ve also included a clip of an unrelated robot project using mecanum wheels so you can see what [Zaggo] will have once he fabricates the rest of the of the wheels. Continue reading “Printable mecanum wheel”
[Eric] built this robot for the 2009 Robocup Jr. competition. The game ball has IR LEDs inside of it and this little bot uses eight IR detectors for tracking. Four motors mounted perpendicular to each other provide locomotion. Since this would normally have you traveling in circles, he used some omnidirectional wheels walled Transwheels. As you can see, they have small rollers built-in and allow movement in any direction if the motors work together. A couple of L298 controller chips handle the motors. [Eric] wrote a program to calculate the PWM necessary to drive the controllers and to coordinate movement of the wheels.
Don’t miss the demo videos after the break and, if you’re not a fan of wheels, stop by and see the bi-pedal soccer robots. Continue reading “Robocup bot places wheels perpendicularly”
Taking a cue from the jog wheel we posted last week, [42ndOddity] has built an improved version. The design is based around a solid state rotary encoder instead of an optical encoder. The rotary encoder is far easier to attach and position properly. The knob is milled from scrap aluminum-it was a copier foot. To make the motion smooth, it’s sitting in a bearing from the same copier.