How To Build Your Own Combat Robot – Hello everyone, this is Robert. Today I’m going to talk to you about AVC and what it takes to build a war robot!
The 10th AVC is only a few weeks away and I am personally very excited. I have been involved in most competitions, both as a referee and more recently as a competitor. After seeing both sides of the event, I can tell that quite a lot of effort was put into both! Coordinating and executing events requires a lot of time and resources, and so does competition. However, building a warbot is one of the most challenging, frustrating, yet rewarding things I’ve ever done.
How To Build Your Own Combat Robot
What exactly is a combat robot? First of all, combat robots aren’t technically robots. They are really just remote controlled armored vehicles that usually have guns. Actually, robots have a level of autonomy that most combat robots don’t have.
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Combat robots have many weight classes, ranging from insect class (one pound – Antweight, three pounds – Beetleweight) to medium size (12 pounds – Hobbyweight, 30 pounds – Featherweight) and finally the largest class (60 pounds – Light). , 120 pounds – medium weight and 220 pounds – heavyweight). There are many other classes up to 150g and up to 320lbs, but these have less (if any) competition.
Generally, the goal is for two bots to enter the arena and hit each other for two to three minutes until someone taps or their bot stops. Of course, there are many restrictions on the types of weapons that can be used, weight and size restrictions, etc. If you want to know more about the rules, visit the Sparc.tools website. It has a standard set of rules that AVC and other tournaments use.
But in the end, most of the fight involved trying to immobilize your opponent by pushing, spinning him, or using rotating weapons to store (and transfer) kinetic energy. Of all the methods, I prefer the second method.
At its core, a combat robot is really just a few motors for propulsion, a battery, an RC receiver, some cables, a frame to hold it all together, and then (optionally) another motor or two to power the weapon. It sounds simple, but it’s not at all. All the components that go into this system have to work under very harsh conditions. Even though a match lasts only two to three minutes, a lot can happen in that time. This means material selection and optimization plays a very important role.
How To Build A Combat Robot
For my 30-pound combat robot, Paralyzing Depression, I used a full range of materials including carbon fiber, various grades of aluminum (6061, 7075, and 2024), grade 5 titanium, S7 impact steel, UHMW. – Nylon reinforced with PE and carbon fiber. One of the greatest aspects of designing and building a combat robot is seeing components and materials to their absolute limits.
To understand the forces involved, we need to talk a bit about kinetic energy (KE) and joules. Here’s a quick physics refresher: kinetic energy is the energy possessed by a moving mass. An apple sitting on a tree branch stores energy (potential energy), but as it falls and gains momentum, it stores kinetic energy (KE). When it falls and hits the ground, the energy is transferred to the apple and the ground. Assuming that an apple weighs about 100 grams and falls from three meters, you can assume that the force exerted on it when it lands is equal to about three joules of energy. I understand?
So how much kinetic energy does a war robot have? Well, it depends on the design and weight class, but 150 joules per pound is a good rule of thumb. So a small one-pound combat robot (Antweight) could have a rotating mass that stores 150 joules of energy, which is roughly the equivalent of 50 apples dropped from a height of three meters. It’s almost like dropping a bowling ball from the same height, which could easily break a few bones and seriously injure someone.
If we start getting into the bigger weight classes, the energy levels get really scary. I have several weapon options for Crippling Depression, and the most powerful guns can do more than eight KJ KE. This assumes that the weapon rotates at full speed and comes to a complete stop, transferring all the energy to the opponent, which is admittedly extremely rare. However, to put that number into perspective, the 357 Magnum on the melee pack is about 672 J and the 12 gauge gun pack is about 4.4 kJ.
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The largest combat robots have KE numbers of over 100 kJ, similar to the forces involved in direct car crashes. That’s why the arena uses steel floor panels and bulletproof Lexan walls. Many robots even use AR400 or AR500 armor plating, which are commonly used in armored vehicles and body armor. The amount of energy combat robots generate is truly terrifying.
With that amount of energy in such a small machine, things would break apart in surprising ways. Magnets explode from motor housings, insulation melts from wires, solder chips off PCBs, screws slide, and solid sheet metal easily twists and bends into unrecognizable shapes in seconds.
With a wide variety of designs (wings, vertical spinners, horizontal spinners, sawbots, trimmer bots, bottom cutters, center cutters, etc.), you have to constantly innovate and iterate on your designs to suit your opponents: Bigger guns, more engines stronger, stronger armor, faster driver, etc. No design is perfect. The strongest vertical spinners can be easily stopped with a simple wedge, wedges can be rendered useless with a wedge, wedges can be removed with a powerful horizontal spinner, and horizontal spinners can be stopped cold in their tracks with a vertical spinner or fin. stop . It’s a rock-paper-scissors game, but with more shrapnel, sparks, and burning electronics.
If it were easy, it wouldn’t be interesting. I’ve spent the last few months rebuilding my crippling depression from the ground up. I’ve replaced the aluminum with titanium, trimmed the weight in a few places to add it in others, and tweaked the geometry around to make it harder to hit while easier to hit in others. I know this is what other people do too, so I just have to cross my fingers and hope for the best.
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If you want to learn more about Crippling Depression, you can check out my YouTube playlist for a report and fight recap of the last two events.
Combat robotics is a great way to learn how to build something that has to perform in extreme conditions. It is recommended to start with the one pound Antweight class to get an idea of how things work and then work your way up from there. There are lots of great tutorials you can find on Sparc.Tools, my YouTube channel, and Arizona Robot Combat.
The best way to start is to find an event and attend as an audience. Thankfully, in just a few weeks, the second largest combat robot event in the US is on its way! Be sure to watch Depression Cripples and all the other competing bots.
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If you want to know the general state of affairs about battle robots and the different types of battle robots, you can learn in the first part how to build a battle robot like a pro. If you’re ready to dive into the details of designing and building a combat robot that can enter competitions and win, then you’re in the right place! We are Team RoboGym and in this article we will tell you how we built the BattleBot, Deadlift.
While all types of robots work well, we at RoboGym decided to design lifts for BattleBots. We found that a defensive robot in thick armor did well by pushing an opponent into a field hazard or lifting him up and holding him in a situation where his wheels were off the ground. Of course, designing a lifting robot also fits our RoboGym theme very well and was too good an opportunity to pass up (*insert flex emoji*).
The design process will probably take up most of the time you spend building the robot. It usually takes several months to go from a paper sketch to a complete CAD (Computer Aided Design) model. When determining the capabilities you want for your robot, there are three important things to consider: weight, weight, and finally, weight!
Like being overweight
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