The most stressed wheel in our system is the driven wheel. We've already fixed the problem with the driving wheel of the scissor mechanism and now it is time to look at the drive LEGO Mindstorms wheel.
Construct two legs for both sides of the robot. The task for this video is to attach this two legs on both sides and to build a system of gears and axles that power those legs.
Here is our solution for preventing torsion and bending of the LEGO Mindstorms EV3 axles.
Note for the teacher on making the construction more stable, more durable and using beams for this.
Let us do a quick recap of the whole lifting mission and its solution
We calculate the number of rotatios when a gear system is involved. The driving wheel will have to do a number of rotations for the driven wheel to rotate to a desired number of degrees. In our specific case when the driven gear wheel is rotate to about 90 degrees the legs will lift the robot.
The final way for lifting our box robot is by using a scissors mechanism. In this Episode, we would discuss the benefits and advantages of this mechanism.
How to change the direction of a beam from horizontal to vertical.
Tips and common mistakes when connecting two beams together.
Simple VEX IQ competition base with a lot of space for attachments and gravity center in the backside of the robot.
Building instructions for a competition robot following the "Box robot" principle. The robot is built with LEGO Mindstorms EV3 and could be used at FLL and WRO.
Building instructions for a LEGO Mindstorms EV3 Robot that we call the Five Minute Bot because it could be built in Five Minutes.
Note: If the robot is making inconsistent turns due to the floor, modify the castor wheel so it is placed further back in the construction. Thus the center of mass falls more over the tires and the turns are more consistent.
Why we change the robots all the time and what to observe in each new robot.
The FIRST LEGO League competition is similar each year. With a little experience you could accomplish most of mission. The goal of this episode is to introduce you to the course, its purpose and approach.
How to organize the different robots and group of students when working on lifting the robot.
Note for the teacher on how to organize the class to use different robot base constructions to accomplish the mission for lifting.
What is the end result? - have the attached on the mission model. What is the mechanism the would make the robot hang on the mission model.
Time to lift the robot. The first approach is by using the 40 teeth gear wheels that come with the LEGO Mindstorms EV3 and NXT robotics sets.
There were a few problems with the 40 teeth gears that we were using. Let's list some of them
Using the rack depends on the experience of the team. Based on this a different number of gear wheels and racks would be used.
