### Box Robot Two for LEGO Mindstorms Competitions

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.

**#257**- 07 Nov 2016
- 4

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.

**#257**- 07 Nov 2016
- 4

In this video we discuss the durability of the construction of LEGO robots and how do we make them more durable.

**#463**- 02 Apr 2017

Following the principles from the previous video, try to make the attachment that you've built, more stable and durable.

**#464**- 03 Apr 2017

In the previous video, we found the correct answer for our task and it is 18.75, or is it?

**#471**- 08 Apr 2017

Sometimes the answer that you get by calculating seems not to be right. Is it the calculation that is wrong. Probably it is not the calculation, but something is happening with the robot.

**#472**- 09 Apr 2017

Connect the attachment to the box robot and find the correct number of rotations of the middle motor that would bring the robot up and forward and would attach it to the mission model.

**#473**- 10 Apr 2017

This is a teacher's note about the math behind calculating gear ratios with for our lifting attachment. It math model we build in previous tutorials is not exactly correct and here is the explanation why.

**#474**- 11 Apr 2017

If you've done the calculation following the previous tutorials you would arrive at a result of 18.75 rotations. But this is not the correct answer. The calculation is wrong, because the math model that we've built, although kind of obvious, is not correct. When experimenting the correct number of rotations would be 37.5. This is a large difference. Two times larger. Exactly two times large. Something should be happening here - and this thing is "planetary mechanism"

**#476**- 12 Apr 2017

How great is the great attachment for lifting that we built in this course? How many times can it lift the robot without making an error? How great are your attachments and how could you test them? - the answer is simple. Just try 10 times and they should work at least 9 of them as our attachment is.

**#477**- 13 Apr 2017