The Department of "throwing" is ruled by rubber bands. Impulsive power release in a short amount of time. In this video we are building an attachment that throws a ball and accomplishes the FIRST LEGO League 2012 bowling competition.
- 30 Aug 2015
The Bowling mission of the FIRST LEGO League 2012, Senior Solutions robotics competition involves a ball that must be thrown. This might seem quite easy so why waste a motor on this mission. It could easily be accomplished with an attachment with a Rubber Band.
Again the attachment is Pinless and could be quickly attached to practically every competition robot construction.
Check out the video and leave a comment if you have any questions or suggestions for new videos.
Previous videos on rubber bands:
- Rubber bands - Solving the FIRST LEGO League World Class COMMUNITY TREE
- Rubber bands - LEGO robot attachment that triggers with a motor
- Rubber bands - LEGO robot attachment triggered with a motor - part 2 removing the motor
- Rubber bands - one more way to remove the LEGO attachment dependency on the motor for triggering
- Rubber bands pinless attachment for taking loops
- Rubber bands attachment for circular motion - solving FLL 2012 stove
- Rubber Band Attachment for loops pushed to the border - FLL2012 Medicine
Other pinless attachments:
Building instructions for the LEGO Mindstorms attachment:
- #material("Pinless Rubber Band attachment for solving the Bowling","fllcasts_rubber_band_attachment_video_103.pdf","pro")
- Today, we are solving an First Lego League 2012 Senior Solutions Challenge using, again, a rubber band. Building an attachment for robot construction and this attachment is triggered with a rubber band. First, as a reminder, this here is a challenge. We have six parts and we have the ball. The challenge is to throw the ball from about 30 - 40 centimeters and when throwing the ball, the parts must fall and they give you, I think, about ten points each. It's important that the ball must be thrown from the roll. It is not the rubber pushing through the parts but actually the ball. And that's the challenge. You can solve this challenge with no tools. You can solve it in many different ways. An attachment with the rubber band is quite interesting. We've built one. I will first show you how it works. As you can see, it's quite difficult to see where the rubber band is. But, now I will load the attachment. The attachment is now folded. I'll place the ball and we attach this attachment to the robot. Then we program the robot to move in the field. This here is the border. It is a bit lower so, you can't see it from the camera, but this here is the border. When the robot reaches the border, we'll push the border like this and we solve the challenge. Now let's look at the attachment in detail. We have the model here with white beams. Now when we push on the part here, as you can see, the axle is lifted and the whole white beams is released. The rubber band is actually inside of the attachment. Just assemble this. I hope you're able to see it. Right here, there is a yellow rubber band. Now, this. And now I can move this white model forward and backward like this and it's actually the rubber band that is doing it. It is pulling on this model. Now if I want to roll it, I will use the axle here to lift the model. And now if I find a way to lift the axle, like this. I release the model and fire the ball. Again, lift the axle, fire the model and the model holds the ball. Now it would be great if we can somehow find a way to lift this axle when we are pushing to the border. This here is the border. So if we find a way to lift the axle when we are pushing, we've actually solved our challenge. And for this we are using this attachment. The tricky part is actually the white part here, the angled beam. We will now add the angled beam here. We've achieved the following result. When we push on the model here, we lift the whole attachment. Again, we load. Then, we push over here. We lift the axle and we fire the model. It's again, a painless attachment. So it's very easy to attach the robot. We just place the robot over the attachment. That's it. Then we add the ball. Load the attachment. We program the robot to move on the field and when it reaches the border, it slightly pushes to the border. And when it pushes the border, we'll have the ball release. Like this. And it's only a matter or question of how long should this be in order to get all the parts here. As always you can find instructions for building the attachment below the video. We welcome any comments and suggestions of other attachments and we'll be happy if you share them with us.