"Fllying Box Turtle" EV3 Robot
This Lego Mindstorms EV3 robot is good for FIRST Lego League (FLL) robot game competitions. It improves upon the "Fllying Tortoise EV3 Robot" ( http://rebrickable.com/mocs/DavidLuders/fllying-tortoise-ev3-robot ). It sports four EV3 Large Motors (two for driving and two for powering attachments), an EV3 Gyro Sensor, two EV3 Color Sensors, and an EV3 Touch Sensor. The modular, quick on/off top "shell" can pin onto the "Box Turtle" base and mesh with the base's gears, and the gear trains route the power through the walls of the shell to possible attachments (hooks, levers, etc.). The two big Lego 88517 Motorcycle Wheels + 88516 Tires come from the Lego Technic 42036 "Street Motorcycle" set. They allow for the two EV3 Large Motors to be mounted "upside down" to keep the center-of-gravity low, and their space-saving profile allows for the EV3 intelligent brick to fit in between. The robot is rear-wheel drive, and there is room to access the EV3 brick's buttons and display. When mounting these wheels on the Technic Axles, be sure to adjust them so that they don't rub on the motors or on the side bumpers. Design your own "shell" and experiment! [NOTE: To prevent the wheels from sliding on the axles and rubbing against the drive motors, recommend replacing the two innermost sets of yellow Half Bushes with 48723 "Technic, Axle Connector Hub with 4 Bars" parts ( http://alpha.bricklink.com/pages/clone/catalogitem.page?P=48723#T=C ), since they are 1-1/2 studs high. Also, you can eliminate the front Ball Bearings and add an additional layer of black 32009 "Technic, Liftarm 1 x 11.5 Double Bent Thick" parts ( http://alpha.bricklink.com/pages/clone/catalogitem.page?P=32009#T=C ) so that the robot rides on broad front "skids" and handles irregular mats better.]
Already have some of the parts? Use the Build this MOC page to only show the parts you are missing.
Waiting for Inventory to load
Use LEGO Digital Designer to open these files and generate step by step building instructions.