SUBTRACTION --- 3 Pound Combat Robot Reveal
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- Опубликовано: 10 сен 2024
- SUBTRACTION is the newest combat robot from Team Just 'Cuz Robotics. SUBTRACTION will be competing at the NHRL September 30th 2023 tournament.
SUBTRACTION is an evolution of Shameless Self Promotion, which had a top 8 finish at the 2023 National Havoc Robot League "Hot Bot Summer" event, and is the basis for the popular SSP 3lb Lifter Kit. The weapon system of SUBTRACTION consists of a completely custom mass manufacturable hubmotor called the JCR 4935 1000kV. If it works, this will become a drop-in weapon attachment for the SSP Kit, and will be open for use in any other custom-designed combat robot as well.
The JCR 4935 1000kV motor has been built for combat from the ground up - everything about it is meant to withstand the immense forces that 3lb combat robots can dish out. The motor itself weighs around 205 grams and is 49mm in diameter and about 35.5mm tall. More details to follow in an upcoming deep dive video...
JCR-4935 MOTORS ARE AVAILABLE!
Many details are on the product page, please read carefully before asking questions here.
bit.ly/4935-pr...
If you are interested in a preorder or beta testing this motor, please email us at team@justcuzrobotics.com!
Just 'Cuz Robotics Website: justcuzrobotic...
Just 'Cuz Store: justcuzrobotic...
Support on Patreon! bit.ly/JCRPatreon
Try PCBWay's CNC Machining or PCB Fab using this link for a $5 new user credit: bit.ly/PCBWayJ...
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#combatrobotics #beetleweight
JJJreact. Hi Jacksfilms!
![Can My Custom Weapon Motor Survive? [Mass Destruction 2023 Recap]](http://i.ytimg.com/vi/LdkIH0p8NEM/mqdefault.jpg)
Man, that motor looks so cool. I've always toyed with the idea of a fully custom motor but it's currently out of my reach. I am still sceptical though, if this motor is capable of being roofed from a weapon on weapon impact.. but it looks really beefy and well designed. You're doing awesome stuff, I'm really excited to see it at Norwalk!
There are a huge number of improvements to this over a traditional motor to make it survive, but you never know til you get hit!
When someone says you can't use a motor for your weapon axle just use a bigger motor instead, much stronger.
The motor weighs 200 grams.... I need that for my ant weight😂
That would be some antweight!
Yeah 😮
Super Sweet Subtraction beetleweight...😊
That engraving timelapse was such a perfect reveal
Thank you!
Hey just found your channel yesterday and have been binging all your videos, you rock man!!! And this is such an AWESOME teaser!!! I’m getting goosebumps watching, so excited for this!!!
Thank you so much!
I AM IN LOVE WITH THIS NEW ROBOT. Best of luck to you this weekend and I will be getting one of those if they go on sale. My only concern is the open space in the chassis where the lifter would go in the lifter version of the SSP kit though I'm sure you will address that before making this an official JCR product. Have fun and be safe. I'll be rooting for you as I'm not judging this weekend's event.
The last couple dozen SSP kits sold have a new chassis that makes this hubmotor weapon a drop in attachment option. If someone has an older SSP they should be able to use a dremel and a drill to make the needed modifications.
@@JustCuzRoboticsjust a thought. Would it be possible for you to sell a version of SSP that is just the chassis and drive so people could design their own weapon to use with the chassis. Kinda like Tie Dye and mako have done.
I won't say that I for sure would or wouldn't offer that. I want to build up at least a couple of my own weapon attachment options eventually. The servo lifter attachment really doesn't cost that much, it probably would not save more than like $20-40 off the price of the kit. Spinner attachments will be a lot more costly for sure, even an ESC for those could cost as much as the servo.
I do hope to offer a drive electronics bundle at a discount that's basically the internals of an SSP that could be used with any custom chassis though. If you are 3d printing a robot chassis it's way cheaper than a milled UHMW one, but UHMW is a lot more durable and more scalable than a 10 hour print per robot.
Wow now that is a good keep it up👍
Thank you, I will!
SSP seems to have learned how to fight back
Division, Subtraction. Hmm I wonder what could be next. Aha, Square Root!
This looks a lot like my 3lb undercutter. I'm excited to see your take on the horizontal game.
My 1lb bot Mini Mulcher is also an overhead horizontal but it's wayyy less stable than Subtraction so I'm pretty hopeful
If Mini Mulcher and SSP had a baby.
It looks like SSP stole Divisions blade...
I like it.
Division has a 7.5 inch blade, SUBTRACTION has a 9 inch blade!
This has gotta be one of the most dope hype videos for a combat robot that I've ever seen
😁 thank you! I really appreciate that. It was a lot of work!
Love the laser-etched name on the top plate
Thanks!
That looks very promising and punishing!
Thanks, I hope it works as good as it looks!
That is going to be fun to watch.
I hope so!
Can you put that upgrade kit in the mail right now? ☠️🤠🤓
Sadly it will take probably 2 months to get another batch but I'll be working on it as soon as I can!
So when you mentioned a spinner upgrade to the SSP kit, I thought you meant like a small vertical spinner module that fits into the lifter slot. This is not what I expected, but I am even more intrigued.
I LOVE IT
Thanks!
@@JustCuzRobotics OMG U RESPONDED TO ME
@@JustCuzRobotics Also this winter i will be making my own mini mulcher
Cool, good luck
thanks@@JustCuzRobotics
Looks solid! Can't wait to see it in action, nice work.
Thank you!
Awesome Over-cutter Spinner named Subtraction. Will it compete with Division in NHRL September 2023.
The September NHRL filled up super fast and I could only register one robot so Subtraction fights alone!
That looks terrifying
😈😈😈
That shaft on the motor looks beefy enough! Good work Seth and good luck.
Thank you!
Is it able to self-right from the crazy torque to weight ratio of the weapon motor, or what’s its plan for inversion?
Sadly not thaaaat much torque. But I was able to get it to drive upside down at least well enough to not get counted out! And might be able to drive into a wall to self right potentially.
The weapon goes over the wheels, so just making sure, it does have a way to deal with being flipped, right?
It kinda drives upside down with the back wheels, but I am going to play with cone shaped attachments over the spinner to see if it can be improved or self right somehow.
Kamikaze! or Mini Blood Sport Looks great!
Looks interesting! Curious to see what your plan for self-righting when getting flipped by a control bot is. Also, the intro music was a great pick this time. :)
It kinda drives upside down with the back wheels, but I am going to play with cone shaped attachments over the spinner to see if it can be improved or self right somehow. If I think there is a very high chance of being flipped I can always switch back to the SSP lifter configuration though. Thanks!
subarashii
Awesome bot, Seth, I presume we'll see it on September 30th!
Yup!
Can I ask why your weapon has two teeth instead of one? My robot's weapon only has one tooth in order to maximize bite into my opponent. Also, super cool robot, I'm a big fan of the direct-driven weapon!
I have a relatively low RPM weapon since it's huge, 9 inches in diameter. So I thought having 2 teeth wouldn't give up too much. Division's weapon actually spins at around the same RPM and its similar looking Superlight Slicer still hits pretty damn hard. I'll definitely play around with different blade designs in the future though.
Prolly dumb question but how does it fare driving inverted?
Not very well! I'm working on that today.
Are they going to cast the fights live
Yes, NHRL has a really impressive livestream. However there are a ton of 3lb robots so most fights may not make it to the stream. They set up a special thing called Brett Zone where you can see all the other fights as well but without commentary. www.nhrl.io/
How thick is the shaft?? Is it hardened steel?
8mm diameter. It's not hardened like tool steel would be but it is heat treated appropriate for a shaft
I Littearly had a Daydream about this being an idea of an SSP bot like this in May so now I am scared of my intuition.
Haha wild
Interesting design.
I wonder what a v2 might look like. maybe tilting up by pushing the back wheels down to get a lower angle on the blade?
Very interested in seeing how that motor survives. I must also wonder if having it go through the case of the bot that close in some way is to help brace the motor since the shaft is sort of cantilevered since its only really supported at the base of the can. Like perhaps when a big hit comes in, its meant to deflect, hit into that top panel, and therefore not need all of the impact to go right into the shaft. I do wonder though if there is enough room/built in flexibility there for that too happen before exceeding how much the shaft can take.
Unlikely
Pushing the back wheels down while may allow better engagements with the lower front weapon, is going to make driving extremely difficult with how angled weapons gyro.
Emer8 is right, my ant has an angled overhead blade and it's sortof a nightmare. Because subtraction is built off of the SSP chassis I have really no choice about the height of the weapon being taller than some robots. Instead I've decided that I'll just lean into the fact that SSP has fantastic ground game. As soon as I get under the opponent they instantly experience full bite on my weapon if they were too short to begin with. This should lead to some gigantic hits if less frequent
Can you confirm that this goes in unseeded into the challenger bracket, as it's technically a new robot? I hope you are really gentle on any newbies who come along with my 1st robot!
As far as I know, yes it counts as a new bot!
Interested to find out about the motor -- be cool if it's able to deal with big vert hits on the blade and doubly so if it can take the punishment without doing the epoxy battle-hardening thing.
I guess I'll see! The FEA simulations I did suggest the blade will bend long before the motor shaft fails but its always possible the magnets explode or something. Only one way to find out, in the arena!
this will probaby be a kit for ssp idk looks like it
Certainly could be if it works!
Do you sell this motor?😇
Not yet! This bot will be the test for the first prototype motors. If they work I'll have them available for preorder in a few weeks
Can it self-right when flipped over?
Not this version, though it can sorta drive upside down. I'll be working on that more with the next iteration. This was sort of a proof of concept.
@@JustCuzRobotics I see. So maybe some ideas from this design will be used in a future bot called "Addition" or "Equation"? To suggest a few new names. ;-)
What I meant is that I want to bring subtraction back with some improvements
@@JustCuzRobotics Ah, ok. So this is basically a beta version of Subtraction and the experience gained from it will lead to the "release" version of it.
Kind of? Everybody is always improving their robots in combat robotics between competions. Rarely do people build a whole new bot every time they compete, and while some people do take the same bot with no changes to several events usually yoy try to make at least some improvements. I have competed with Division for 2 years and I changed things all the time.
TEAM PEMDAS!?!
Looks a bit like a 3lb crippling depression! Very cool.
that bot sucks
You could put a bigger weapon and rename it SSD: shameless self destruction
That would be difficult it's kind of close to the weight limit right now. I probably will play around with different weapon designs in the future though. Maybe I can try one that requires the front forks to be removed to make weight for an even larger weapon
0:44 swastikas on the weapons lol
No... I'm Jewish I would never. Its just an interface pattern that's cheaper to lasercut than 9 holes would be.
@@JustCuzRobotics oh i was just joking, I know its not on purpose so dont worry