3Lb beginner’s guide – robojackets wiki gas vs electric oven temperature


The purpose of this guide is to educate the reader on some key factors relating to the 3lb weight class of BattleBots, such as common robot types, the design process, and common materials/components. While originally intended for members of the RoboJackets team, this guide contains information that is relevant to anyone trying to get into BattleBots!

This guide primarily focuses on robot design, rather than information on the actual competition. For information about competition rules, it is often different between competitions so please visit that competitions website or social media for specific rules. electricity history However, for a good generic set of rules that are common across most competitions you can look at the Northeast Robotics Club (NERC) rule set here.

Within the 3lb weight class of combat robots there are five common robot types found. This section will quickly introduce these commonly found robot types, and explain their similarities, differences, pros, and cons. By the end of this section, you’ll have a clearer idea of what kind of robot is most interesting to you, as well as the associated design challenges of that robot type.

Members of the RoboJackets Battlebot team do not build Wedge’s because there is no real design challenge in designing a Wedge, and RoboJackets values the educational experience of designing a more complex robot. Building a more complex robot allows you to learn engineering skills that scale to more advanced competitions. Ultimately, while Wedge bots may be good at winning competitions winning the competition isn’t the goal. The true goal is to learn about the design process and have fun!

Being successful in competitions starts with the design process. While everyone wants to immediately jump into machining and get their bot done, without a proper design process the end result will be ineffective and probably nonfunctional. Additionally, without a proper CAD assembly with accompanying dimensions machining will not result in usable parts. So while it might not be as exciting as machining and assembling, it pay off in the end. Spending extra time on the design process will highly increase the quality of your final design and assembly.

This is when the design process will start properly. Once you’re on a team, the first goal is to come up with a bot design. Think broad. Focus on features. The design process is iterative, so you will make changes to this design. However, this doesn’t mean that it’s not worthwhile to come up with some rudimentary overall dimensions, such as the overall length, width, and height of the bot. gas vs diesel generator These dimensions can be based loosely off of previous bots as a guideline.

The top sketch is a good example of what should be drawn at the start of the sketching step. As a team, you will produce several of these sketches, each time adding more details as you discuss the design. As you can see this top view shows the approximate location of the frame, wheels, motors, and weapon. electricity in the 1920s Details such as fasteners and electronics are not yet included, as this sketch would be developed before those are considered. It is important to work out details in a logical order.

As more details are finalized, the sketches will become increasingly complex. Eventually, your team should have a detailed final sketch, such as the bottom example. As you can see, most if not all components are included. Multiple views are included as well, which will significantly help with visualization of the final design. It’s noteworthy to see that while the sketch is incredibly detailed (and no you don’t need to be an artist, most final sketches won’t look this good), it still wouldn’t be enough to jump directly into CAD. That’s why we have the next step!

Once you’ve got an overall sketch of the bot, its time to start drawing some individual parts out and assign them some dimensions. This is important, as having some predetermined dimensions will make the CAD process easier. Make sure that your team is communicating during this process, as its important that everyone understands the dimensions so that any given member could make the CAD part for any given part. The more your team understands the dimensions you define, the faster and more efficient the CAD process will be. Additionally, drawings should be made that give explicit details in areas of the bot that have complex assemblies and sections of the bot. Having these draw out ahead of time will expedite the process of translating the drawing into a CAD assembly.

Another thing to consider during this time is how you will attach the parts into a complete assembly. Consider using a puzzle-fit, the number of screws used to connect two parts, location of holes, and size and type of screws. electricity terms and definitions Beware intersections of screws, and don’t have so many screws that your part is completely filled with holes, or "Swiss-cheesed".

This step can be done simultaneously with Steps 3 and 4, as you draw and dimension parts as you need them during the early meetings. However, it’s important not to put off finishing the drawings for all parts, as it can make it harder to work outside of meetings. There should always be a group present when dimensioning parts, so if you don’t have any parts that are dimensioned, you can’t make a good CAD part.

• Weapon RPM: This will be an important factor for your over destructive capability. For smaller spinning weapons, such as a drum, RPMs greater than 8000RPM are desirable. For larger spinning weapons, such as a bar, RPMs between the range of 2000-5000RPM are desirable. This number is lower than the smaller weapons because if you RPM is too high with a bar spinner, you risk significant recoil when you hit the enemy and severe gyroscopic effects inhibiting responsive driving. electric utility companies in california Its one thing to rip the opponent’s bot in half, but if you destroy your own bot in the process it’s meaningless.

• Spin-up time (s): This value represents the amount of time required to get the weapon from rest to its max RPM. The first to strike in the competition will often gain the immediate upper hand and if the enemy bot runs into your weapon before its spun-up completely, you will deal little to no damage and the weapon will once again need to spin-up from rest again. Keeping this value as low as possible is incredibly important. In general, a Spin-up time of around 1 second would be reasonable, but ultimately it’s up to your team to make the call on what you think is an acceptable amount of time.

This step will actually start at the same time as you’re looking at choosing a motor. As part of your calculations, you will need the weapon to made in Inventor so that you can get its Mass Moment of Inertia. From there you will need to create a part for the motor that your team ends up choosing, using the dimensions and weight provided by the website you found the motor on.

Remember that the parts will need to be manufactured from stock, so once you have determined a way to manufacture a part, check how much the stock you’d need will cost and how much material will be wasted as part of your manufacturing. mp electricity bill payment online jabalpur For example, if you have a part that you know how you could manufacture, but it would require a $100 chunk of aluminum, most of which is removed in the process, maybe look at redesigning the part to be simpler so it can be manufactured with cheaper stock.

• Assign the material property of a part, to ensure that it’s reported weight is correct. The default "generic" material will not accurately report your weight, which will result in you being overweight once everything is built. You also may find that you have only made half of the parts you need, and the overall weight is already too high. With this information, you can go ahead and adjust the dimensions of the parts you’ve already made to reduce the weight.

Proper CADing is a team effort, not a solo endeavor. When you work alone, you risk misinterpreting a dimension or drawing. During meetings, one or two people should be actively working on the CAD with the remaining members talking through the process with them. Communication is key! You will end up creating quality uniform parts only by working together. Taking turns working on parts is also important, to ensure everyone gets time working with Inventor. Please remember that it is expected that your team will meet and work outside of our regularly scheduled meetings!

The whole design process is leading up to one thing: The Design Review. During the design review, you will present your team’s assembly to the rest of the BattleBots team. Both your peers and the senior members will ask you questions about your design and point out design flaws and recommendations on how to address them. Often times your first design review will be fairly harsh, with senior members finding plenty of issues with your design. While this may seem mean-spirited, they are simply trying to help you build the best bot that you can. The larger bots will often undergo the design review 3-5 times before they are finally approved to start machining, so even the senior members have to go through this process. Because the 3 lb bots are much simpler, usually only 2 design reviews will be needed.

It’s important to take notes during the design review, as even a "good" design review will result in enough changes that you’ll need to write them all down. gastroenterologia o que trata You will likely get a lot of feedback, and while in the moment you may feel like you’ll remember it all it will be impossible to remember every little comment. Step 7: Revise and repeat

Once you get out of a design review, it’s important to strike fast while the iron is hot. After your first design review, there will more than likely be several huge changes that you’ll need to make to both your individual parts and the assembly as a whole. There is NOT a lot of time between the first and second design reviews (often only a week or two), due to the natural time constraints of the 3lb program. grade 6 electricity unit test So it’s important to start working on these changes sooner rather than later. It’s important to also make sure you address ALL the things that are mentioned during the review, as it’s important not the waste everyone’s time with repeat issues from the previous review.

Below is a step by step guide on the calculations required to determine what motor to choose for your bot. Keep in mind these calculations are fairly simplistic and don’t take several real-world factors into account. Additionally, these values will be computed based off of what is reported by the manufacturers, which are often "best case scenario" and are not what you should expect to see in practice.

In this section, I will describe some of the most common materials used to build a 3lb combat robot. Aluminum, Steel, and Plastic are the most commonly used materials for building a 3lb robot. While there are a few more materials that some teams use (e.g. carbon fiber or titanium), these three materials are affordable, lightweight enough to be used in a 3lb combat robot, common enough that they can be easily purchased from a variety of sources, and strong enough to be used in for combat.

Plastic is a fantastic material for armor, as it is lightweight, cheap, and surprisingly strong! Armor on a 3lb combat robot is not supposed to be rigid, and strong, as that means whatever energy that is transferred into the armor gets then transferred into the robot’s structure. Plastic dissipates the energy that is passed into it by breaking and being ripped apart. Due to the low cost and high machine-ability, you can manufacture several sets of armor pieces and replace them as they are broken. This is much better than having to manufacture and replace core structural components!