# Improving FLL Robot Game. Durability of a LEGO robot construction ProPreview

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
• 4:24

### Front side of the attachment

Both legs move away from each other and we should find a way to attach them to each other to prevent this.

### Bending of the back

Because of the force applied from the driving force what happens is that the back of the robot attachment bends. We should improve the attachment to make it more.

### English

Our next step is to discuss durability of the construction and how you make the construction more durable so that it does not make this. This here is the construction that initially we came up with and when you add this construction to the Box Robot you see that you have one leg on the left side and one leg on the right side and then if you transfer some power from the motor, what will happen is that the legs will try to lift the robot. Like this. It will move up.

The problem with this construction was that it's not very durable and when you apply some pressure and because of the robot and with the force for lifting the robot what happens is that the two legs move away from each other. And you see the whole construction is bending. The other problem was that on the back side of the attachment again because of the force applied from the driving axle the back of the attachment was again bending. And because of this it was some of the gears were missing some the of the teeth and it was not working very well. So, there are a couple of things that we did to make the whole construction more durable and to solve a couple of other problems.

Looking at the front side of the attachment what we decided to do is to connect both legs. And for this we'd just use a number of beams that are connected to each other. And we connect one of the legs to the other. And from here the whole construction is now much more stable because the legs are not going away from each other. Another advantage of this attachment was that when we have the mission model and the mission model looks like this. When we have the mission model without the attachment I'll remove the attachment what was happening is that sometimes some of the legs could enter one of the holes. Both legs won't enter both holes but one of the legs could enter one of the holes. Now with the beams at the front, like this.

No matter how we approach the mission model the legs will never enter the holes. And that was the first modification for our attachment. Connect the two legs that are at the front so they don't go away from each other. Second problem with the attachment was that with the initial construction that was like this when we apply some force on the axle the whole construction at the back of the attachment was bending. And because of this it was actually disassembling the whole construction and not only the gears were not working but some of the pins were detached and some of the beams were bent and the problem with this is that we have only one line of beams here that are connecting these two legs. What we decided to do is to have a second line that will make the whole construction much more durable. Again, we have one line at the top. What we need now is one line at the bottom right here. And this will make the whole construction more durable. Let's put it.

It takes some time because of the many pins that we'd use but at the end you see that it's much more difficult to bend the construction.

## Courses and lessons with this Tutorial

This Tutorial is used in the following courses and lessons

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