Destroying a Battlebot: Part 3
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- čas přidán 6. 06. 2024
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Well, carbon fiber is made of carbon fibers in a Polymere matrix. Carbon, like graphite is a conductive material, so are the carbon fibers. Having a conductive, tightly woven mesh will function as EMV shielding, not as good as copper mesh, but the principal is the same.
An EMV shield will protect your electronics from EM-radiation, but also prevent signals to go through.
In high performance rc aircraft we either use glas or kevlar for the area of the enclosure where the receiver is. Or we get the antenna outside, but then you have to have two antennas to avoid radio shadow.
@@Argosh I know, did RC stuff too. 👌🏻 Also built race cars with carbon fiber monocoque during my mechanical engineering studies. We had wireless data loggers with antennas, had to put them outside the monocoque.
Yes, I would add that quartz fiber is often used for application where RF transparency is needed. Quartz fibber is fully compatible with most standard carbon fibber processes, which makes it usable in a multi-material carbon/quartz part
In RC planes, especially gliders, we often use a Kevlar hatch over the antennas in the nose cone when doing the layup.
Since carbon fibers are conductive my theory is that the sheet of carbon fiber will act as a faraday cage... Don't know for sure, just speculation
Yep - not necessarily a faraday cage, but carbon fiber is certainly radio opaque enough to attenuate radio signals. Radio controlled aircraft with carbon fiber fuselages usually have a kevlar or glass fiber section for mounting the receiver antennas.
Forget the carbon fiber stuff ask for the wood robot creator the wood, glue and nails that he uses 😂
Foamed cellulose is a heck of a building material.
I use carbon fiber for rocketry, and I always leave an RF window in either G10 or kevlar for the telemetry antenna. You'll completely shield any transmitter by wrapping it in carbon.
Just wanted to say it was great talking to you guys at the event and I can’t wait to see what else you build in the future!
carbon fiber plate is like 1-5 ohms across A4 , so you get the idea :)
3:25 I like how you snagged the handle off your chiller to use for pulling the cover...
Go two dowel pins and two screws to hold the teeth on next time. I think threads are pretty bad under shear loading. But good work on your first(?) comp!
In single seater racing with carbon fiber monocoque, we use copper tape surrounding the hole for any radio antennas. This helps a great amount with radio quality/signal.
In the end bot fighting is about transferring kinetic energy to your opponent.
To quote schlock mercenary: If you're leaving scorch marks you need a bigger gun.
I saw myself!! It was super cool meeting you!
Great meeting you! Can’t wait to see more of this bot! (I was the guy you can see briefly standing behind my printer lol) BTW if you’re looking for a way to make this thing hit harder, check out the 3lb bot Halo, bots like that have an offset ring with one big tooth so it hits with a super high MOI!
CF is conductive and so will block RF, simple as that.
If you really want to use CF then you need to have small section (50mm hole?) in CF where the antena is and cover it with G10.
G10 is glass fiber based so basically transparent to RF.
And regarding the attack bits, why invent the wheel?
Look up some mining equipment or some kind of large milling equipment and see how they do it, then just copy it to the last detail.
It was awesome meeting you and thanks so much for sharing what you learned!
One of my favorite fights, you are a fantastic driver and that bot was kick butt! - DropKick
Awesome 3 part series of videos. 🤘🤘🤘🤘
I love the S&A chiller handle. Lol
Carbon fiber is highly conductive. Using it on the top means that you made a very basic faraday cage between the steel floor, aluminum ring, and carbon fiber top. That's also why you always house your tracking radio in a fiberglass section instead of a carbon fiber section in rocketry.
Man loving these videos
Reading the Carbon Fiber interfering wirh the radio waves, I think understand some of the issues. You should limit the number of angles beweeen plies. So a [0, 90, 0, 90] layup would block more than a [0, 0, 90, 90] layup. I wrote a paper on a similar topic if you are interested.
Can't wait to see V2 or a any weight version 😍
I just fond this channel a few days ago and BOOM. new video
I would recommend the vex robotics gear boxes that are often used in FIRST tech and FIRST robotics and they are all metal gears and they usually hold up pretty well and are modular meaning you can easily repair them and change your ratios as needed. You will probably need a custom adapter but I feel like it would be worth it for the strength and modularity.
Awesome good video serie keep them coming!
Would love to see more combat robot videos. Norwalk Havoc is a massive event with cash prices.
Whenever I see fighting robots I always think a hydraulic sheer would be a great weapon. A snap action with sharp tips to hook onto the body panels followed by a strong shear action to cut through stuff. Like the jaws of life just smaller.
I'm still a sucker for the massive spinners, stuff like Carbide from Robot Wars. With the giant bar spinning they get kinetic energy equal to like a 50 cal hitting the opponent, without needing to get a hold of them.
@@theoolifent9074 Yes it is brutal, but also for your own robot. I have seen so many fighting robots loose its spinning action.
@@MaxMakerChannel oh yeah, they can cause serious issues for themselves. But when they work they're just spectacular to watch.
Where do you get your parts from?
In our carbon fiber RC slope soaring gliders we use Kevlar in the nose so the radio signals can get through.
You could also spring load the sliders
If you like those gearboxes as a size package you can probably just replace the plastic gears with metal ones. I do this on my 22mm for my beetles.
Oh that was cool to see Witch Doctor
Awesome robot and awesome video
Retired physicist here. I did some conductivity measurements on carbon fiber years ago. I found most samples to be conductive to various degrees depending on how it's manufactured. G10 is not conductive, so it's the better material for radio transmission.
I know this is almost a year old...
1. What you want for the teeth is shock/impact resistant tool steel. This sort of application is exactly what this category of tool steel is for. In the US, this will. typically be "S" followed by a number. S2 steel is super common and cheap, if not the best. You should also consider plain carbon steels, much cheaper and easier to find as "trash". Farm equipment blades used in an impact vulnerable application tend to be around 0.75% carbon, which is the sweet spot for the best toughness, strength and hardness in carbon steel.
2. To resist bolts pulling out of aluminum, you need coarse threads. I know the math says it doesn't matter, but real life says otherwise. This in particular is an infamous problem for car engine cylinder head bolts for aluminum engines. Lookup the Cadillac Northstar engine. Aluminum loves to gall too, coarse threads will help deal with that.
3. Carbon fiber composites are strong in a *_per weight_* basis. Fiberglass composites are far stronger in a per volume basis.
Ever thought about in-hub motor skateboard wheels?
To solve your wiring problem you could use a duel print head 3D printer and conductive filament and print your wiring directly into the housing.
Carbon Fiber is conductive, so it works like a Faraday Cage. Very nice if you enjoy the serenity, not so much when you need the not serenity.
I bought a carbon-fiber ignition switch cover and mount for one of my Ducati Monsters - the main problem is it wouldnt let the chip-reader ring actually READ the chip in the key..... So I had to swap it back to the dopey black plastic cover/mount -
Awesome build! Awesome fight. just my 2 cents but sort of "knife edge" your weapon. Taper it down some what like a gear cutter, with a slight sharp edge cutter but round at the corners, like a gear cutter....if I didn't say it, already.
Hello there. Nice build! Carbon fiber attenuates as everyone else mentioned. At HF with large vertical antennas, it will absorb energy and distort the radiation pattern. My understanding is that it is much worse the shorter the wavelength. Hit me up if you ever want to talk RF! Good luck next time!
In aircrafts they cant use carbon fibre nosecones since this blocks the microwaves used in the radar system. So your carbon plate most likely blocked any signals trying to pass through
You have plenty of comments about carbon fiber, so I figured I would ask about the secondary weapon. Did you consider designing the inserts with a chip breaker, to kick out material being removed from opponents? I think just a little bump or curve past the cutting edge is all it should take.
Carbon Fiber indeed attenuates RF, it's pretty much a non issue for lower frequencies, but definitely has a noticeable impact on UHF/SHF and above and it causes issues in the hobby RC world. Adjusting antenna placement or using different material adjacent to the antennas so the CF isn't between the bot antennas and your controller's antenna will help.
Iirc carbon fibre is conductive, so if it touches ground (like the massive amount of aluminium) it would act like a RF shield
@@justfpv1432 Yep!
What's the name of your bot?
Can you continue the project?
Make a chamber inside your spinner that holds bbs to self balance after the weapon loses balance.
Carbon fibre is a conductor, so you're trying to send and receive signals from a Faraday cage. Let's say that leads to suboptimal connections. I have the same with a GPS in my carbon fibre velomobile, and the newer GPS (Garmin Edge 1030+) seems to suffer from that more than previous models, probably reflections within the carbon fibre shell that confuse the hell out of the unit.
The 2.4ghz frequency of the rx/rx system shouldn’t greatly suffer from conductive panels nearby.
Glorified vacuum cleaner 😂
If you want to keep it alive I would love to help with that effort. Just putting it out there lol
Cost?
Carbon resistors are made of yes carbon so carbon is conductive so you create a Faraday cage. That is why the radio problems
I want to see the 250 lbs version of this bot inside the Battle Box..
It seems like the more rigid the bot is the harder it goes down. I wonder if anyone did some super soft bot exterior?! Need to see more fights..
Super soft exteriors tend to run afoul of the anti ablative armor rules. Wood however can be incredibly tough. But it may just be as expensive and hard to machine as aluminium. XD
There are a fair number of bots that use flexible materials. Probably most known is HUGE which is made primarily of HDPE and can shrug off many big hits to their big flexible wheels. There are others that use TPU to absorb hits.
You may want to consider g force feedback controlled electromagnetics, may lock you on the ground
I meant to make this comment on your last video: your weapon appears to be statically balanced but not dynamically balanced. Unless you've got hidden balance weights, it will wobble at speed.
en.m.wikipedia.org/wiki/Balancing_of_rotating_masses#Dynamic_balance
I can tell you from experience with airplanes that carbon fiber completely blocks radio signals.
CF aircraft have the same issue. Glass is radio transparent, CF is not.
Carbon fiber is conductive and therefore you're making a farada cage using it, it's even worse if you're connecting it to ground even indirectly. The mass you have will act as a huge capacitance plate, you're best off externally mounting the antenna or using the carbon fiber as one via tuning.
carbon fiber is electrically conductive each fiber can carry current thus the carbon acts like a faraday cage!
All plastics have the ability to create and hold charge, the difference in fiber glass and carbon composites is the carbon fiber can conduct electricity, this means as friction happen the plastic can create charge and then flow through the carbon fibers, the flow of electricity creates small electromagnetic fields which can cause interfere! Great bot, great show!
6:10 vid starts here yw
'one wepon on wepon contact' you mean.. he hit you once
Sooo... See you in a year and and a half for the next episode? ;-)
heyloo
Hi
Doomba was a beautiful bot! If you ever need help with combat robots, let me know!
Should put a large bearing in the center of the front and back, to keep it from wobbling.
A single 1/2in ball bearing would work.
Those could also be spring loaded, to keep in constant contact with the ground.