Mini Mulcher, Shuriken Blade! SWORD Fall 2021 (Antweight 1lb Combat Robot) Event Recap

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Mini Mulcher finally got to enter its first real tournament! More than a year in the making... Will all the hard work pay off? Let's find out!
Wanna buy the full CAD model and make your own? bit.ly/MMv1CAD
Mini Mulcher Playlist: • Mini Mulcher Antweight...
Just 'Cuz Robotics Website: justcuzrobotics.com/
Just 'Cuz Store: justcuzrobotics.com/shop
Instagram: @JustCuzRobotics
/ justcuzrobo. .
@bloodsport_battlebot
/ bloodsport_. .
@retrograde_battlebot
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Bloodsport/BnS Facebook Page:
/ bnsrobotics
Sorry about the double upload, audio issues in the first one forced me to unlist it.
#CombatRobotics #Antweight
00:00 - Opener
00:30 - Intro
01:05 - Design Motivation
02:25 - Event Format
03:11 - Fight 1
05:06 - Fight 1 Breakdown
05:56 - Fight 2
08:25 - Fight 2 Breakdown
10:13 - Fight 3
16:03 - Fight 3 breakdown
17:09 - Fight 4
20:59 - Fight 4 Breakdown
22:10 - Fight 5
24:27 - Fight 5 Breakdown and Closing

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20 июл 2024

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Комментарии : 138

@Jalor218 2 года назад

Lesson learned: if you're hosting an antweight event, invest in a tube of sealant for the crack between the arena wall and floor.

@JustCuzRobotics 2 года назад

Yeah that's not a bad plan haha

@Ossimsauce 2 года назад

If you manage to keep that thing stable with the same 100% weapon power it'd be absolutely monstrous

@JustCuzRobotics 2 года назад

Indeed, that's the real challenge!

@wishusknight3009 2 года назад

you would only need to add 2 pounds to its base...

@phoeniewenie1768 2 года назад

@@wishusknight3009 the limit for the whole bot is 1lb bro

@wishusknight3009 2 года назад

@@phoeniewenie1768 /wooosh

@wishusknight3009 2 года назад

@@phoeniewenie1768 I meant that as a little sarcasm to relate how much gyroscopic effect the weapon has.

@pyroman7196 10 месяцев назад

You could use your weapon to double as a vacuum or at least attach to the same shaft a smaller suction fan

@ethantemple8068 3 месяца назад

I was going to ask how much weight a vacuum would need but this sounds like a good way to avoid external weight and shouldn’t tax the motor too much.

@ekflagristoj 2 года назад

I think we just saw a champion in the making! To me the most important part of a fighting robot is the drive; and these fights proved that Mini Mulcher's is solid! It took no damage at all over several fights, it wasn't just getting pushed around and is low enough that it stalled out enemy wedges, and at lower weapon speeds it stuck to the ground very well with low speed but great handling. If switching to a 4 wheel or tank treads setup or wheel material change helps stick to the floor better at high weapon speeds there won't be any match time or attack opportunity wasted by gyro acrobatics so you'll be at 100% all the time!! Fight 4 was really a highlight too. Going in at a disadvantage against a vertical drum but going weapon to weapon over and over both taking zero damage and recovering from the clash faster than the opponent was an impressive feat!

@JustCuzRobotics 2 года назад

Thank you so much! I definitely agree four-wheel drive seems like it will most likely be in the next revision. I am currently using soft surgical tubing as tires which gives the wheels pretty good grip already and I think that might be why I was able to stalemate the wedges I fought

@ekflagristoj 2 года назад

@@JustCuzRobotics Ooh yeah that's a really good idea! In a wedge to wedge clash the soft tubing compresses into the floor for more surface area to grab with! If you're always spinning the disk in the same direction when at full speed maybe some kind of body shape asymmetry on the side that lifts up could also help? Kind of like how the shape of the spike on top encourages a certain behavior when flipped over a body shape that somehow resists lifting on a particular side through geometry or wheel placement or weight distribution could be great.

@zzxxccvvkk5 Год назад

for horizontal spinners, give them upside down airplane wing edge to create downward force. in my opinion unsticks should have to w8 10 sec

@JustCuzRobotics Год назад

Propellers dont really work well at the relatively slow roms of a horizontal spinner blade plus that's hard to manufacture in steel.

@ellindsey000 2 года назад

FUBAR Labs in New Brunswick, NJ has built an antweight arena. They're planning on having tournaments every three months or so. Their next event is on January 15th.

@JustCuzRobotics 2 года назад

I'll have to check that out, though it is probably not any closer to me

@BLOODKINGbro 11 месяцев назад

Just be ready for the bot to get decimated.

@cornmaized 2 года назад

Fight against revy was great! Very action packed!

@celiciaatchison Год назад

I know I am pretty late but what it you sanded the edges of the spinny one to create more downforce? Just a thought. Enjoyed the video and good luck!

@heirofaniu 2 года назад

"I had to drive 300 miles to find the nearest event." Yeah welcome to what it's like to live in the midwest.

@Ebmx220 2 месяца назад

fr lol

@JustCuzRobotics 2 месяца назад

Yeah but I live less than 60 miles from Boston which is a major city, you would think something closer would appear. Thankfully there is a new event in Hartford CT for 1lb bots which is 139 miles from where I have moved to, and I have competed there a few times since this video

@heirofaniu 2 месяца назад

@@JustCuzRobotics I'll be honest I wasn't expecting replies on a two year old comment that hasn't garnered any attention up to this point. I'm just making a joke my man, I don't mean anything by it and yeah a five hour drive blows regardless of where you live.

@misternachname517 Год назад

I know its been a while but what about shaping the shirken in a way it creates downforce?

@everythingrandom1381 9 месяцев назад

This is a great method I'd say, but I feel like the bigger problem is the counterspin on the drive...something like a reverse spinning counterweight at high rpm or something would probably be worth it.

@willwoll3138 2 года назад

Will you be at the Motorama event in Harrisburg, PA in February? They have an ant weight division. (My son will be competing for the first time there).

@JustCuzRobotics 2 года назад

I have been to the last three Motorama events but not this year. With the current Omicron strain of covid it seems like it's probably not the best idea to go to an event with so many people. I'm going to have to see how things are when March rolls around for Norwalk Havoc as well

@fromfin90 2 года назад

you do have a disadvantage when fighting the fight 3 when you need to run and spin up, but you also chose to have a lot of the mass spinning above your head, choices consequences. would tracks or a 6wd design fare any better? i know tracks might be heavy, but perhaps stability and traction?

@warrior3d27 2 года назад

hey seth, liking your content here, can you explain your self-right wedge on the top? it bounces back up with the movement of the weapon or has its own mechanical part?

@JustCuzRobotics 2 года назад

The self righter is purely passive. It sorta sucked in this competition due to a last minute design change that didn't exactly work. Here you can see it worked a lot better before ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-4teBeaaUl7E.html

@Bob-ss5zt 2 года назад

i imagine weight would be a severe issue, but perhaps you could try looking into the weird "toothed" wheels Lynx and Project Liftoff use to get a ton of grip on the wood floor at Norwalk ?

@JustCuzRobotics 2 года назад

I think that could potentially be doable . However... That style of wheel has really good kinetic friction so to speak but I don't think it actually holds that well when it's just sitting still and I doubt that it would really help on spin up. They work well for driving forwards and backwards because they can dig into the floor but my problem is that my wheels try to slide sideways to spin the chassis

@angzarr9584 10 месяцев назад

keep it closer to the ground and have a skirt that goes around the entire bot?

@TexasGTO 10 месяцев назад

8:48 I get your point. I do. But man they gave you like 45 sec to get unstuck yourself. So I mean, "balance"? Anyway, cool bot man. I loved the video.

@mandytreutens9099 Год назад

it looks like bloodsport from battlebots... very cool!

@JustCuzRobotics Год назад

Well I am on the Bloodsport team so I can't say it wasn't a little inspired by that, but looking like Bloodsport was not intentional 😊

@MrChirpz 6 месяцев назад

The way the guy said "Well it's our arena" Is enough for me to literally go back in time and never play the sport lol.

@levievil9220 9 месяцев назад

Let’s see our root has a weight problem weapon body ratio should be enter

@Dia1Up 2 года назад

Ahhhh here it is \o/

@jeromedupont3397 10 месяцев назад

would it be possible to shape the weapon so that its rotation generate a downward force like a reversed helicopter blade ?

@JustCuzRobotics 10 месяцев назад

I'll copy paste my answer from the other 10 people who had this idea lol. Number 1: there is a reason tiny drones and airplanes do not use hardened steel propellers. It's really expensive to shape steel into an airfoil. Number 2: the blade isn't spinning fast enough to produce what I could call useful downforce. Usually you will see over 20000rpm for a 9 inch propeller, and I am limited to like under half that speed so even with a propeller I could get at most half as much thrust as you would think. Number 3: a sharp edge like a propeller needs would get dulled or fractured immediately when hitting hardened steel or titanium armor and it would quickly become imbalanced causing yet more issues.

@jeromedupont3397 10 месяцев назад

Thx for the really informative answer ! Sorry for making you repeat yourself (I did browse the comments for similar suggestion before posting, but not enough it seems 😅).

@honroy1950 2 года назад

if you make your wheel base wider, it might counterract the torque better, but other than that, i cant think of a feasible solution within the weight

@JustCuzRobotics 2 года назад

That's a thought I had as well. But I think having less than 100% of the weight on the wheels also doesn't help. I may need to try and move to 4 wheels to fix that

@Nate_Squared 10 месяцев назад

Some downward force on the blade similar to a fan might help?? I really don’t know. Don’t know about engineering that either.

@JustCuzRobotics 10 месяцев назад

I'll copy paste my answer from the other 12 people who had this idea lol. Number 1: there is a reason tiny drones and airplanes do not use hardened steel propellers. It's really expensive to shape steel into an airfoil. Number 2: the blade isn't spinning fast enough to produce what I could call useful downforce. Usually you will see over 20000rpm for a 9 inch propeller, and I am limited to like under half that speed so even with a propeller I could get at most half as much thrust as you would think. Number 3: a sharp edge like a propeller needs would get dulled or fractured immediately when hitting hardened steel or titanium armor and it would quickly become imbalanced causing yet more issues.

@Nate_Squared 10 месяцев назад

@@JustCuzRobotics thank you for the education, Sir 🫡 I knew there had to be a good reason.

@toonverbruggen7351 2 года назад

I think a propeller underneath the robot would be a good solution. With the ground effect it should be able to create massive downforce while weighing very little and requiring little spin up time.

@JustCuzRobotics 2 года назад

That would require a gigantic hole in the top of the robot to allow air to flow through it

@toonverbruggen7351 2 года назад

@@JustCuzRobotics I don't think it would have to be that big. Have a look at the stuff that is in the powerup planes. I have one at home, it is quite small and light, but the thrust that thing gives is insane. You could try some impeller kind of style too, to push all the air from under the bot. Just pitching ideas, I know aerodynamics aren't used too much on combat robots but with these antweights they could actually make a difference!

@revimfadli4666 2 года назад

@@toonverbruggen7351 impeller which blows to the side could be an interesting alternative. Maybe that comes with other possible issues as well?

@JustCuzRobotics 2 года назад

Unless it's shorter than the weapon it would be chopped in half lol

@MrTuber-sb8eu Год назад

@@JustCuzRobotics What about making the weapon itself a fan, just a tiny tiny bit?

@TeamJunkYardDog 2 года назад

Great job!

@JustCuzRobotics 2 года назад

Thanks!

@TeamJunkYardDog 2 года назад

@@JustCuzRobotics Any chance you will be in Florida on Jan 15th in Oak Hill. 500 for first! We will ne fighting there.

@JustCuzRobotics 2 года назад

Florida? No definitely not. That's a lot too far to drive and flying right now seems like a bad idea.

@TeamJunkYardDog 2 года назад

@@JustCuzRobotics Understandable lol.

@Living_Murphys_Law 2 года назад

Would magnets be feasible, or would they mess with the electronics?

@JustCuzRobotics 2 года назад

Last I checked magnets don't do jack on plywood floor

@Living_Murphys_Law 2 года назад

@@JustCuzRobotics Oh, it's plywood. Never mind then!

@huntzzio 2 года назад

I wanna see this thing be stable so it can go even more BOOM Also, alternate name idea: Shrapnel Shooter

@JustCuzRobotics 2 года назад

I think there are too many bots with Shrapnel in the name already given I have Shrapnel Mine and there was another beetle at this event just called Shrapnel. It was very confusing when fight announcements were made.

@huntzzio 2 года назад

@@JustCuzRobotics ah true

@bloogaming8827 2 года назад

What if you designed the weapon to provide some downforce?

@JustCuzRobotics 2 года назад

Not physically possible with a flat steel lasercut blade. And it would be almost impossible to make any sort of metal weapon that shape and still have it be effective. Propellers are not a simple thing.

@daniellewis2542 2 года назад

You do truly have a great design. Let me be honest but weight is what balance out air plans think about it. The wage idea is helpful do to pushing up bots to your top blade witch at full power will rip bots I can see it now. So put a track on it and it will keep it on ground more. Then for safe righting becomes your issue let's see here add more Ts for it to land on then it should roll right over if you get what I mean. Hope some ideas here help fucher champ 🏆 🙏

@JustCuzRobotics 2 года назад

Not sure what you mean by "Ts" actually...

@toddlerdurden7331 Год назад

Could you shape the spinning blade in a way that makes it produce downforce?

@JustCuzRobotics Год назад

This have been brought up before. Number 1: there is a reason tiny drones and airplanes do not use hardened steel propellers. It's really expensive to shape steel into an airfoil. Number 2: the blade isn't spinning fast enough to produce what I could call useful downforce. Usually you will see over 20000rpm for a 9 inch propeller, and I am limited to like under half that speed so even with a propeller I could get at most half as much thrust as you would think.

@toddlerdurden7331 Год назад

@@JustCuzRobotics perhaps secondary propeller could solve the first issue and a faster motor for that propeller could solve issue two, but then you would have weight and packaging issues etc to deal with I guess.

@JustCuzRobotics Год назад

Adding a motor, ESC and more battery capacity is the worst way to handle a problem like this. Calvin Iba tried adding a propeller inside his new bot Sucker Punch and it completely failed and caused tons of issues. If he can't do it I can't do it.

@TeamJunkYardDog Год назад

Add some 3D printed Ailerons tabs to the blade to generate downforce.

@JustCuzRobotics Год назад

It's been done before by others, unfortunately the blade is spinning very slow compared to a propeller and it would generate almost no useful downforce

@cornmaized 2 года назад

I think Unsticks are generally more trouble than they’re worth, sure your robot could get stuck in a disappointing way, but this can often be due to a design flaw more than anything, there is a case to be made for unsticks but they often interrupt the pacing of Matches far to much, allowing only a single unstick is a good compromise, but maybe it should be something the driver asks for instead of what they did in the paper towels fight.

@JustCuzRobotics 2 года назад

They were basically making it so you only get an unstick if the arena causes the stick rather than the other robot. If I pinned the opponent against the wall and they got stuck I think it would have been a count out. But it was very strange how fast they called for a pause either way.

@crazycatlady4391 10 месяцев назад

Maybe shape the blades more like a fan pushing air downwards.

@thn82_ 9 месяцев назад

Coming in 3rd place in a competition is still top 3, regardless of the number of entries :)

@JustCuzRobotics 9 месяцев назад

Maybe not so much if there are 3 entries 😛 But I take your point. This bot still has a lot of flaws I want to work on though!

@charlessampson6389 2 года назад

link to the mini mulcher playlist is broken

@JustCuzRobotics 2 года назад

Good catch, fixed!

@jasonmapotts Год назад

I feel like that Lionheart fight was kinda weird. Watching the bigger bots they don't really un-stick the bot more of get pinned/counted out or get wrecked by the other bot. Why was this a thing in these matches?

@JustCuzRobotics Год назад

Sword had their own weird rules about unsticks not followed by most events. I agree it was odd.

@flamingpig5717 2 года назад

Do you have a recommended weapon thickness? weapon weight? And weapon material?

@JustCuzRobotics 2 года назад

Material, AR500 is generally very good and what I use exclusively on my small bots. Everything else totally depends on your design and what you want to accomplish. I have a spinner design video series that may be of interest to you.

@flamingpig5717 2 года назад

Oh I forgot add that this is for a vertical spinner 1lb robot. Would that change any of the specs?

@JustCuzRobotics 2 года назад

Again, it alllll depends on what you want to accomplish. Me telling you what to do would remove all the fun of the design process. You need to understand what affects those choices and make them yourself.

@flamingpig5717 2 года назад

Ok, thx tho

@SpiderWaffle 2 года назад

Would it be feasible to put a small high speed counter gyro inside, like Ziggo did? Weighted with Tungsten maybe.

@JustCuzRobotics 2 года назад

I think that using tungsten would increase the cost of this robot by 3X immediately, haha. That also requires me to sacrifice weight somewhere. If I have to make the weapon lighter I think that sortof solves the problem by itself, but it also means smaller weapons and less reach

@SpiderWaffle 2 года назад

@@JustCuzRobotics Ya that's kind of the idea I guess, cut some weight on weapon, put it into a tiny gyro. Were the weapons ever close to failure? Maybe you could keep almost all the reach but decrease the weight enough, and use more inner radius weight cuts to keep more moment of inertia. All the weight going to a gyro.

@JustCuzRobotics 2 года назад

The Shuriken bent a bit against Revy so it's borderline. I think adding an extra spinning thing might not be the easiest way to deal with the problem. We'll see, I've got plenty of time to think on it.

@wadekirby8575 2 года назад

@@JustCuzRobotics (if you had the weight) a counter rotating blade would be neat. If it was powered by the same motor it would spin up at the same rate and should balance nicely.

@SpiderWaffle 2 года назад

Ya, a more challenging solution, but more interesting engineering, and maybe a better one.

@user-sq7eq6tj2t 7 месяцев назад

Your robot looks like bloodsport from battlebots

@JustCuzRobotics 7 месяцев назад

May have been very slightly inspired given I'm on the Bloodsport team

@goronimus304 2 года назад

4:37 haha fart noise

@Leto_Atreides_ 9 месяцев назад

Ithink the referee was paper towels dad or something lol, stopped as soon the guy had a problem

@ethanbazewicz3316 Год назад

Use magnets

@JustCuzRobotics Год назад

Magnets don't work on wood floors!

@paydaygh9388 2 года назад

I saw a robot built by a young child that looked like a top hate. Maybe add a lip like that to make the robot harder to tip?

@JustCuzRobotics 2 года назад

I'm worried anything like that would also make it hard to self right if I do flip. I definitely want to put more effort into improving the self righting somehow. I think if the 'talon' weren't able to spin it would be perfectly fine from my testing at home.

@wadekirby8575 2 года назад

@@JustCuzRobotics could you move the clamping screw in so it intercepts the shaft it's mounted to (and file a notch) so it can't rotate?

@JustCuzRobotics 2 года назад

That was what I did on the prior version but sadly screw threads don't hold at all in plastic. I may be able to make it work with a threaded insert but I think figuring out how to lock it in place with a pin or something may be better

@DigitalJedi 2 года назад

Perhaps running the weapon on a dead shaft would be better. Make a square end on it and drill a hole through to mount it.

@JustCuzRobotics 2 года назад

It is already on a dead shaft, a shoulder bolt that mates into the body with a hex nut in fact. So you're on the right track. But the bolt isn't turning, the talon is clamped onto it and apparently I couldn't get it tight enough. So it spins freely from the bolt which is the main problem. I think maybe using a shaft that cannot rotate at all and permanently pinning the self righter to it so they are locked together might solve the issue, the new issue then becomes lack of any adjustability to get the angle right. It needs to be dead on the first time.

@RadarLeon 10 месяцев назад

Shoulda just kept the shuriken the entire time that other weapons just seem to destabilize your entire bot

@JustCuzRobotics 10 месяцев назад

The only issue is that the Shuriken bends if fighting a vertical spinner since it really is too thin and flimsy to take vertical hits. It's designed to out-reach wedges and other horizontals with a 9 inch diameter, while the stout and short Axehead blade can tank vertical impacts.

@RadarLeon 10 месяцев назад

@@JustCuzRobotics i do get that, it's always a work in progress, this stuff has always fascinated since the 90s, hope you the best that is still a nasty bot :3

@TheOctopus333 2 года назад

Wedge bots are so lame, they should make a rule for at least have one real weapon per bot

@JustCuzRobotics 2 года назад

You should watch all of my Norwalk Havoc recap videos. They have that exact rule in place for those competitions

@TheOctopus333 2 года назад

@@JustCuzRobotics ahah didn't think you would reply ! Yes, this competition seems a bit special ... Thank you for the great videos ! I enjoy following the evolution of the bots !