Useful Notes: Robot Combat
Two robots settling their differences over a nice cup of tea.
In 1993, a Lucas Film
toy designer named Marc Thorpe was disassembling a remote control vacuum cleaner he had pitched to his bosses. However, an idea soon came to him. What if he attached a chainsaw or a power drill to it? Marc had a vision of his creation cutting a hole through his wall. If other people built machines like his and fought each other, what could come of it? The following year, the first annual Robot Wars event took place, and as result, the sport of Robot Combat was born.
Robot Combat is a popular hobby/sport wherein competitors construct remote controlled machines (dubbed robots, although the majority are not autonomous) of varying designs to fight one another... to the DEATH! (or a judges decision, ring out, disqualification, and so on.)
Robot Combat was at the peak of its mainstream popularity in the late 90s and early 2000s, where BattleBots
and Robot Wars
enjoyed good ratings and were heavily advertised. These days, the number of competitions has skyrocketed to dozens per year across several countries and continents, most notably in Europe and North and South America. Robo Games still draws good crowds, and Battlebots still hosts non-televised tournaments from time to time, having spent more effort re-purposing their business as an educational robotics experience under the name Battlebots IQ. Builders come from all walks of life, from special effects technicians to programmers and engineering students from nearby schools, to your everyday hobbyist with access to a machine shop.
For a great source on learning the basics of robot construction, see here
For a great source on buying robot parts, see here
Robot design is heavily varied in regards to mobility and weapons systems.
- Wheeled Robots
- The most common type of movement for robots; the number of wheels as well as the design of steering dicates how well a robot can be controlled. For example, two wheeled robots can spin faster on an axis, making them good designs for robots with spinning weapons (such as bars and discs), or for spinning a fixed weapon (such as the design for a thwackbot/overhead reaction robot). Robots which operate on car style steering lack the precision of zero radius turning, but make up for it through being in constant movement and also being easier to maneuver.
- Treaded Robots
- Opting for tank treads instead of wheels, the design for treaded robots are useful in that they can climb over pretty much anything in their path, but are ultimately more form over function. They look great, but are also more complex to build, more easily damaged, heavier, and don't offer any real benefit in regards to traction.
- Walking Robots
- This is where it gets complicated. Legitimate walking robots, that is, robots which move on independent legs, are a rare breed, costly to build, and while photogenic and crowd-pleasing, not very effective in battle due to a lack of speed. When i say legitimate, i am referring to the presence of shufflebots, which operate in a manner like walkers, but instead of using legs, use sections of feet in order to move faster while still benefiting from the weight advantage bonus that walkers receive (extra weight = extra weapons + harder to push around). Newer regulations disqualify shufflebots from getting this bonus, but have also made the qualifications for a "real" walker more stringent. Walkers are now mostly found in other robotics competitions, such as the non combat events of RoboGames.
- Robots employing high-power drive trains and heavy armor are able to use their speed and maneuverability to crash into their opponent repeatedly with hope of damaging weapons and vital components. Their pushing power may also be used to shove their opponent into arena hazards. Rammers (AKA ‘Bricks’) typically have four or six wheels for traction and stability and are often designed to be fully operational when inverted. Robot Wars Series 6 champion Tornado and Series 7 Runner-up Storm II were effective rammers.
- Similar in concept to a rammer, the wedge uses a low-clearance inclined wedge or scoop to move in under an opponent and break its contact with the arena floor – decreasing its mobility and rendering it easy to push off into a wall or hazard. The wedge is also useful in deflecting attacks by other robots. Wedges are also used to lift an opponent up to make the attack of another weapon more effective. A small wedge may be attached to the rear of a robot with other weaponry for use as a ‘backup’ in case the main weapon fails. The 1995 US Robot Wars middleweight champion La Machine was an early and effective wedge design as was Robot Wars Series 1 champion, Roadblock (1997).
- Continuously rotating weapons are popular and varied. These use a dedicated motor to spin up a heavy bar, studded disc, or toothed cylinder (drum/eggbeater) and use it to strike the opponent with the kinetic energy stored in the rotating mass. The mass may spin on either a horizontal or vertical axis, although vertical spinners may have maneuverability problems due to the gyroscopic action of the weapon. The destructive potential of a well designed spinning weapon requires robust arena containment to prevent shrapnel being thrown into the audience. Three-time BattleBots middleweight champion Hazard was a horizontal bar spinner.
- Full Body Spinner
- Taking the concept of the spinner to the extreme, a full body spinner (AKA shell spinner or tuna can spinner) rotates the entire outer shell of the robot as a stored energy weapon. Other robot components (batteries, weapon motor casing) may be attached to the shell to increase the spinning mass while keeping the mass of the drive train to a minimum. An FBS robot takes several seconds to spin the heavy shell up to effective speed, and they must evade their opponent while waiting for that speed. The 1995 US Robot Wars heavyweight co-champion Blendo was the first effective full body spinner.note
- A narrow, high-speed, two-wheel drive train attached to a long boom with an impact weapon on the end creates a robot that can spin in place at a high speed, swinging the weapon in a horizontal circle. The simplicity and durability of the design is appealing, but the robot cannot be made to move in a controlled manner while spinning without employing sophisticated electronics. The 1995 US Robot Wars lightweight champion Test Toaster 1 was a thwackbot, as were T-Wrex and Golddigger from BattleBots.
- Torque Reaction
- A variant on the thwackbot is the torque reaction hammer. These robots have two very large wheels with the small body of the robot hanging in between them. A long weapon boom has a vertically oriented hammer, pick, or axe on the end. On acceleration, the weapon boom swings upward and over to the rear of the robot to offset the motor torque. When the robot reverses direction, the weapon will swing forcibly back over the top and hopefully impact the opponent. These robots are simple and can put on a flashy, aggressive show, but their attack power is relatively small. BattleBots 2.0 middleweight champion Spaz was a torque reaction pickaxe robot.
- Using tactics similar to a wedge, the lifter uses a powered arm, prow, or platform to get underneath the opponent and lift it away from the arena surface to remove its maneuverability. The lifter may then push the other robot toward arena hazards or attempt to toss the opponent onto its back. The lifter is typically powered by either an electric or pneumatic actuator. Two-time US Robot wars and four-time BattleBots heavyweight champion Biohazard was an electric lifter.
- Although mechanically resembling a lifter, the flipper uses much higher levels of pneumatic power to fire the lifting arm explosively upward. An effective flipper can throw opponents end-over-end through the air causing damage from the landing impact or, at Robot Wars, toss it completely out of the arena. Flippers use a large volume of compressed gas and may have a limited number of effective attacks before their supply runs low. The two-time Robot Wars champion Chaos 2 and BattleBots super heavyweight champion Toro were flippers.
- Another lifter variant, the clamper adds an arm or claw that descends from above to secure the opposing robot in place on a lifting platform. The entire assembly then lifts and carries the opponent wherever the operator pleases. Two-time BattleBots super heavyweight champion Diesector was an electric clamper.
- An uncommon variant on the clamper, the dustpan simplifies the design by replacing the lifting platform with a wide box open at the front and top. An opponent maneuvered into the box may then be restrained with an arm or claw from above. Some designs use only the box with no restraining claw.
- Related to the dustpan, the crusher uses a hydraulic cylinder attached to a sharp piercing arm to pin and slowly penetrate the usually weak top armor of the opponent. Enormous strength and careful engineering are required to build an effective crusher, which may be why there have been only two successful crushing combat robots: two-time Robot Wars world champion Razer and two-time Robot Wars Annihilator champion Kan-Opener.
- Overhead Axe
- Swinging a high-speed axe, spike, or hammer forcefully down onto your opponent offers another method of attacking the vulnerable top surface. The weapon is typically driven by a pneumatic actuator via a rack and pinion or direct mechanical linkage. The attack may damage the opposing robot directly, or may lodge in their robot and provide a handle for dragging them toward a hazard. BattleBots heavyweight runner-up and Robot Wars competitor Killerhurtz was armed with an overhead axe.