And when the brick moves down, the lever moves up and we fire parts. Now we should find a way to attach the nest to the lever so that we use the gravity force. It's constructed mainly from angle beams and a frame and some pins that attach all the parts together. To actually hold the brick and use its weight at one of the ends of the lever, I've built this, let's call it, a nest. Here I am showing the NXT brick but you also have instructions for building the robot using the EV3 version of Mindstorms. A simple solution is to use the brick from your set. And when we press probably a button or something it will lift the lever and fire the part. The last step of building our catapult is to find something heavy that we can attach to this end of the lever. If I move the lever very fast, it will fire the part. And again, I've come up with a solution to this. If we find a way to add some parts at the end of this lever that will hold this small Lego part, we'll be able to fire it. We attach it to the frame - like this.Īnd now it moves freely up and down. The second step of building our catapult is to build a lever that will fire the small Lego parts. And it's much more stable than the other frame.Īnd we do this on the other side as well. So, we can solve this by adding two additional beams that will attach the frame to the base at a certain angle. We use two of the these modules to build the vertical frame of our catapult and it looks something like this.Ī problem with this frame is that it's not very stable. So, I will show you how you can attach the basic modules and what's the idea behind them. Now, I won't be constructing the robot every step on the way. The larger the base is, the more stable the catapult will be when it fires different small parts. It's a very simple construction - it has just a frame and four beams attached to each other. We'll be happy to get your feedback and if you try to construct this robot at home or in your classroom.įirst, I'll start with the base of our catapult. You can load it and reload it completely automatically. And you can use this very funny construction to fire different small Lego parts to about 1 meter - 1.5 meter. We will provide you with constructions for both EV3 and NXT versions of the robot. This video is the first of a number of videos in which we will show you how you can construct your own catapult. How to use the Ultrasonic Sensor with the Catapult built from EV3/NXT (Part 5)Ĭatapult build from LEGO Mindstorms EV3/NXT (Part 4 - EV3 clutch and loading)Ĭatapult build from LEGO Mindstorms EV3/NXT (Part 3 - Automatic loading)Ĭatapult build from LEGO Mindstorms EV3/NXT (Part 2 - Base)Ĭatapult build from LEGO Mindstorms EV3/NXT (Part 1) The haviest part in the set is the brick and we use it as a weight. Using angle LEGO beams we build a nest for holding a weight. The lever should not be longer than the frame and should have a proper construction at the end that would hold the parts until they are fired. You can always make the frame taller, but keep in mind that the taller the robot frame, the more unstable it becomes. If you want to improve the stability of the robot you should make the base larger. The construction from this first video lesson is divided on the following modules: Base At the end of the series we would have build a completely automated catapult the loads and fires automatically. Loading the catapult can be done by hand or automatically with a motor and an NXT-G program for the robot. Firing parts requires no additional force since the force of gravity is used. We briefly show what the end result would be and we build the initial construction for the robot. It was also included in 1900 Castle Space Special Bonus Set.This video lesson is the first of the catapult series.Oddly, the set's name suggests that it's attributed to a king, a fact that would usually refer to a Crusaders set.This is one of only two catapults of the Black Knights line, the other one being 1491 Dual Defender from 1992.The set is identical to 2890 King's Catapult, which was released as Promotional set in Japan in 1998.It contains one Black Knight minifigure and a small catapult. 1917 King's Catapult is a Black Knights set released in 1993.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |