Rubber bands, gear wheels and motors attachment for solving FLL 2013 Truck and Ambulance (part 2) Pro Preview

Extend the previously build attachment for the FIRST LEGO League (FLL) Nature's Fury competition so that we can move the Truck and Ambulance up and down. 

  • #110
  • 11 Oct 2015
  • 5:15

Challenge at the FIRST LEGO League (FLL) competition

When moving the Truck and the Ambulance we could lift them in the air. This would require us to transfer power from a LEGO Mindstorms Motor to the robot attachment.

Previous video tutorials

Instructions for building the robot are available at:

  1. Improving the EV3 Competition Robot by Mic Lowne

  2. EV3 Competition Robot Construction

Ambulance and Truck Robot Attachment

If you take a look at the videos for this attachment you will see a nice idea on taking the track and the ambulance. These two vehicles from the FIRST LEGO League 2013 competition had to be collected and returned back to base.

Built from LEGO Mindstorms EV3 parts. 


- Previously we started building an attachment for solving the the 2013 "Nature's Fury Truck" challenge. The attachment was using the crowbar bands and the gear wheels and a bunch of levers. This here was the attachment. And we ended when the attachment was just catching the truck. Now we are going to throw some power from the robot to this attachment.

Of course, check out the link below for more information about the mission, and what exactly is required. Let's now try to again take the EV3 competition robot from episode 58. I have a cable here that I want to attach. This here was the robot.

And we must now find a way to add this attachment to the robot. Why? Because we can catch the truck using only the rubber bands. So again, like this. We move. We reach the truck and just fix this. We move and when we reach the truck, we have the levers working with the rubber bands and we catch. But now, we would like to lift the truck like this. And if we can lift it, we will just move along on the field, and leave the truck in the yellow region. So it's much wiser to lift the whole truck because there will be no friction between the gear wheels (the wheels of the truck) and the mat. For lifting the whole truck, we've put an axle here with a gear wheel and now if we can transfer some power to this gear wheel, we will be able to lift the whole truck. Let's see how we can do this. This here is our robot. It has a medium motor on the front and we first change the direction of rotation because we need it in one direction. We have it in one direction here and we need it in another direction here. And we must also attach this whole attachment to the robot. We've come up with a simple idea. You can find out more about this below the video. It comes from a series of videos about changing direction with gear wheels. And we have it again here. We have the drive wheel - this small one here. Let me just find an axle to show you. We have this small gear wheel here and it's the driver wheel and this here is the driving wheel and we can transfer power from one wheel to the other. We add this whole attachment to our robot like this. And now as we have this part because it's quite heavy with the attachment, we have two gear wheels both on the left and on the right side. This here is the right side gear wheel. Let me just show it to you. And this here is the left side - right here. And now if we add our attachment and we can now move with the robot on the field, reach the truck, move to the truck, catch the truck, and now we transfer some power from the model to the gear wheels here, we will lift the truck. I will now start the motor and we can see that we are lifting the truck.

That's it. Not very high. Just below the field, and we can now move with the robot and the truck on the field. In the next video we will extend the attachment so that we can also take the ambulance and then we will look at how do we release the truck from the attachment.