Team Dudge build diaries.

All things antweight

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Derek Dudge
Posts: 109
Joined: Thu Dec 07, 2017 9:32 pm

Re: First time building diary: Third Law

Post by Derek Dudge » Sun Feb 04, 2018 11:49 am

As promised, final update for this first project.

Third Law made it to Ant freeze 5. I owe the guys from teams Nuts and Shakey a beer one day for helping out by fixing my ESC, without those guys I wouldn't have been able to enter my bot. Got the deluxe pits treatments for an Antweight right there. He's a lucky little bot for a first time build.

The very first time he drove was his first match in the main competition. So, naturally I didn't get very far. But he got to play around some more in the break, and in the awesome nuts game and the huge rumble. It was a real fun day.

Damage wise he came out ok because he didn't have to fight the biggest scariest spinners 1 on 1. In the rumble I caught one decent hit from one of the spinners (think it might have been Tauron fellas Tim Ratchett spinner) and it chewed up a bolt head so the screwdriver doesn't fit in the grooves any more then took a little slice of paint job/plastic with it. Looks like the bolt took the brunt of the hit though. He's in one piece though and I can spend some time learning to control him better.

Linked are a couple of videos of him on the coffee table getting his disco mode on.

https://m.youtube.com/watch?v=u8fCFGHTdS4

https://m.youtube.com/watch?v=5Q9DhmQcLDA

I guess that's Third Law mk 1 project about finished. I now have an ant to practice driving with, yay it works haha. I'm pretty happy with him.

Aftermath assessment is - bad stuff - next one has to be a bit tighter, there was lots of "close enough" moments building him, and he could be a lot neater, particularly with the electronics. My weird sideways raised up motor mounts aren't really study enough. Between the fun at ant freeze and him driving off my coffee table a few times I managed to loosen one and had to refasten. The flat sides are obviously not an optimal design and my bolts are evidently gonna suffer from hits as they are.

Good stuff - it's got a good pushing power and a couple times at ant freeze I was able to push another bot head to head. And i think with a bit of practice it will actually steer pretty well. I like the speed and even just playing around for an hour when I got home I felt I was getting more nimble scooting around with him.

So, now I practice until I'm a decent driver lol, and go back to design pondering I guess. Do I do a different bot next, or do I try design Third Law mk 2? I am not sure yet. Lots to think about. That's for another thread in a little while now though.

Many many thanks again to the folks who helped me out along the way. Yayyy I did it, the robot worked! Heh.
Last edited by Derek Dudge on Mon Apr 09, 2018 5:19 pm, edited 1 time in total.
My robots:

Third Law (antweight) - push/ram bot
Manticore (antweight) - hammer bot

JeffSergeant
Posts: 28
Joined: Mon Jan 01, 2018 3:23 am
Location: Cambridgeshire, UK
Contact:

Re: First time building diary: Third Law

Post by JeffSergeant » Tue Feb 06, 2018 9:20 am

Ooh that was you! Hello!

Looked like you had the controls nailed to me. Sequel should be Asimov's 3rd Law, it might do what it's told :)

Got it on video during the lunch-time pusher rumble,

https://youtu.be/3Rr73B80tk4

The blue LED also looks awesome

Derek Dudge
Posts: 109
Joined: Thu Dec 07, 2017 9:32 pm

Re: First time building diary: Third Law

Post by Derek Dudge » Wed Feb 07, 2018 2:15 pm

Hey Jeff. Cheers for posting that. I actually managed to pit a bot in that clip haha.

Had a few ideas for the next project but not committing to any of them yet. I will do some scribbling in the meantime and think about it while waiting for things like the new nano controllers. I'm on holiday in march so won't be at the next ant event, so I got a while.
My robots:

Third Law (antweight) - push/ram bot
Manticore (antweight) - hammer bot

Paulmchurd
Posts: 171
Joined: Sun Dec 10, 2017 4:39 pm

Re: First time building diary: Third Law

Post by Paulmchurd » Wed Feb 28, 2018 8:22 pm

I've made a very similar robot. Have you come across a time when you have been flipped on your side? Do you get stuck?

I can't figure out a way to self right the robot if it lands on its side...

Derek Dudge
Posts: 109
Joined: Thu Dec 07, 2017 9:32 pm

Re: First time building diary: Third Law

Post by Derek Dudge » Wed Feb 28, 2018 9:00 pm

The only thing breaking up the flat side is a pair of unsunk bolt heads. I've tried rocking it onto its side a bunch of times. Usually it will rock straight over. A few times it did balance and get stuck.

Definitely a downside in the design but I doubt it could happen very often. Sod's law says it chooses the worst times though I'm sure :D
My robots:

Third Law (antweight) - push/ram bot
Manticore (antweight) - hammer bot

Paulmchurd
Posts: 171
Joined: Sun Dec 10, 2017 4:39 pm

Re: First time building diary: Third Law

Post by Paulmchurd » Sun Mar 04, 2018 1:54 pm

I was thinking some sort of side bolts at two differnt lengths would make it unbalanced enough it would rock over. The robot building ideas are endless...

Also could you link the leds and resistors you used? I’m interested in adding some on my robot aswell. I’d rather copy someone who has it working then buy things when I’m unsure.

Thanks
Paul

Derek Dudge
Posts: 109
Joined: Thu Dec 07, 2017 9:32 pm

Re: First time building diary: Third Law

Post by Derek Dudge » Sun Mar 04, 2018 4:09 pm

Yeah, I mean don't get me wrong it's a weak factor is such a boxy design, but the bolts do seem to make a big difference that way. Of course it does mean the bolts aren't so protected.

Heres the resistors https://m.ebay.co.uk/itm/1-4W-0-25W-Met ... 3719182016

The leds https://m.ebay.co.uk/itm/Ultra-Bright-L ... 7916800016

The tool for which resistor is needed for which leds (maybe you won't need this but I did lol) http://ledcalc.com

Hope that helps! All the best.
My robots:

Third Law (antweight) - push/ram bot
Manticore (antweight) - hammer bot

Paulmchurd
Posts: 171
Joined: Sun Dec 10, 2017 4:39 pm

Re: First time building diary: Third Law

Post by Paulmchurd » Sun Mar 04, 2018 5:07 pm

Awesome!

Thanks

Derek Dudge
Posts: 109
Joined: Thu Dec 07, 2017 9:32 pm

Re: Team Dudge build diaries.

Post by Derek Dudge » Sat Mar 10, 2018 3:55 pm

Yayyy. New build project has officially begun!

Starting another thread seemed unnecessary so I changed this one to reflect it's not just for Third Law anymore.

Next up - working name of Big Choppa, an axe/hammer bot to turn solo robot into an actual team entry.

The body will be a mixture of different thicknesses of plastic this time, got some 1mm and 1.5 this time to try economise weight a bit better.

Drive will be nanotwo ESC and nuts and bolts wheels. Only 2wd this time. The axe will be gearmotor powered and a vex ESC.

I made a cardboard model. Few pictures attached including a couple next to Third Law for comparison.

I'm sticking with a similar design for armour mostly because it's easy to plan out, and also for a uniform look across the two bots. Just cause I'm a sucker for that stuff lol.

I've not figured out the weapon head yet. Gonna make a polycarbonate version of the chassis etc so I can work out exactly how much much weight is left etc.

Honestly, I don't expect it to be super high end competative, because it's highly likely the weapon will mostly be plastic too but it feels a nice next step up from Third Law in complexity etc and that seems as good a goal as any.

More updates soon hopefully.

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My robots:

Third Law (antweight) - push/ram bot
Manticore (antweight) - hammer bot

Derek Dudge
Posts: 109
Joined: Thu Dec 07, 2017 9:32 pm

Re: Team Dudge build diaries.

Post by Derek Dudge » Sat Mar 17, 2018 5:05 pm

Progress is a bit slow this month on account of holidays and such things. A bit of progress has been achieved through and the chassis and armour for axe bot is now done in polycarbonate.

Ohhh and new working name for the fella. Introducing Manticore hehe. Actually surprised a bit of searching didn't turn up any ants already called this what with it having Ant in there and all.

A couple pics below.

Next up is wait on payday haha, but after that next step is getting motors for drive and one for the axe, and to work out how exactly to mount the weapon etc. Will update again after any progress!

Image
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My robots:

Third Law (antweight) - push/ram bot
Manticore (antweight) - hammer bot

Derek Dudge
Posts: 109
Joined: Thu Dec 07, 2017 9:32 pm

Re: Team Dudge build diaries.

Post by Derek Dudge » Mon Mar 26, 2018 11:32 pm

Woo. Orders submitted at last for the rest of the parts for Manticore.

Pair of 30:1 motors for drive, a 50:1 motor for the weapon, vex controller for the weapon, various mounts and hubs for the various motors, a switch and a spool of wire all should be en route.

Happy chappy is I, been looking forward to finishing the project up. His empty chassis and armour been sat around for a couple weeks giving me the evil eye for not finishing him yet. Hopefully some pics soon!
My robots:

Third Law (antweight) - push/ram bot
Manticore (antweight) - hammer bot

Derek Dudge
Posts: 109
Joined: Thu Dec 07, 2017 9:32 pm

Re: Team Dudge build diaries.

Post by Derek Dudge » Fri Mar 30, 2018 7:19 pm

Finally some real update!

Manticore has mutated a bit more since my original ideas in that he's now a hammer bot and not an axe as originally planned for. Been working on him the past few days and through lots of trial, error, holes drilled in the wrong place and the occasional urge to give him a quick launch toward the wall, finally things are coming together a bit.

Still loads to do. I ordered some smaller wheels from Shakey so he sits at a less steep angle. Wiring it all up is gonna be more fiddly than Third Law was, extra ESC to account for this time and I gotta be careful no wiring hinders the weapon' s movement. There's space to work with behind the wheels though.

Gotta fiddle around at the back making a proper rest/brace/cushion type thing to keep the arm of the hammer where it won't hit any internals when it moves back.

The weapon itself - until it's all connected up I have no idea at all how effective it will be, or how stable it will be when firing, whether it will flop like a fish, who knows? I know it will make a bloody racket hitting wooden arena floors. It should work as a self righter. I hope.

The whole weapon arm, down to the mounting hub but not including the motor, is about 26 grams. Now the closest thing I've been using as a visual guide/comparison is George's Axiom but that is heavier on the weapon (40g or so iirc) but has two motors. If you reading this George, how you think that will do, 26g of hammer on 1 pololu 50:1?

My best estimate account for the bits I haven't actually done yet has it coming out a few grams overweight. So there'll be some more drilling and trimming in my future no doubt.

Coming along though! Pics below.

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My robots:

Third Law (antweight) - push/ram bot
Manticore (antweight) - hammer bot

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GeorgeR
Posts: 148
Joined: Sun Aug 28, 2016 9:53 pm
Location: Bath, Somerset

Re: Team Dudge build diaries.

Post by GeorgeR » Sat Mar 31, 2018 6:41 pm

That's looking good, nice to see another hammer/axe.

The hammer should be good and stable with those specs, and should have plenty of power to self right.

One motor will definitely be fine with a 26g weapon, Axiom's original 40g/10cm axe still worked on one motor in the latter fights of antfreeze 4, after one of the gearboxes died hitting Don't Hug Me's blade.
Team Zero
Zero - rambot - - Axiom - axebot - - Valkyrie - drum spinner
Vampire - horizontal spinner - - Orion - horizontal spinner walker

Derek Dudge
Posts: 109
Joined: Thu Dec 07, 2017 9:32 pm

Re: Team Dudge build diaries.

Post by Derek Dudge » Mon Apr 09, 2018 2:49 pm

Update! Manticore is close to finished now. Thanks again for all the info, George, it's been a huge help! Owe you a beer one day.

The wiring is basically finished. My soldering is still childlike but progressing slowly perhaps haha. Drive works fine, although ooooof I have learned I definitely prefer the handling on Third Law with his 4wd to this twitchy little 2wd set up. Yet another new found respect for all you guys that make driving ants look easy.

That's all good though, I got time to practise.

And the weapon will work. The speed controllers work together fine and I've changed the radio to operate the weapon on rudder instead of throttle. However the only reason I know it will work is from subbing in a drive motor to check, as super annoyingly the one I bought for the weapon is broken. Double blow in that I bought it a couple weeks ago and the shop only takes damaged returns for 7 days from delivery. Lesson learned, will endeavour to test these things more promptly in the future.

New one is on order and should be here soon. I'm looking forward to finally testing the hammer properly. I think it will be a noisy little robot.

And the picture below illustrates probably the best news of all - he's fitting under weight limit! I'd allowed what I had hoped was plenty for internal fixings and wires etc but still a relief when I plonked him on the scales.

Image
My robots:

Third Law (antweight) - push/ram bot
Manticore (antweight) - hammer bot

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DieGracefullyRobotics
Posts: 152
Joined: Mon Apr 02, 2018 7:39 am

Re: Team Dudge build diaries.

Post by DieGracefullyRobotics » Mon Apr 09, 2018 3:36 pm

That's a cool looking robot, I love the hammer. My soldering is childlike and I've been doing it 15 years, so don't worry about that, ha.
What transmitter are you using? Might be able to do something to make it less twitchy for you in the settings unless it's just a basic model.
Dave
Die Gracefully Robotics - Barely Even a Proper Team.

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