The Hotel Lima, for Ants: A Build Diary

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LimaHotel
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Location: W. Devon

The Hotel Lima, for Ants: A Build Diary

Post by LimaHotel » Sun Jan 06, 2019 10:00 pm

Yo! Hi!
I've been milling around here for a while - my first intentions of doing this date back to April!
However, now I be here. I still have no... concrete... plans, but I do have some rather fluffy ones, and some very real components.
Lets start with what I have: The components.
5x LemonRX DSM2 6-channel w End pins
3x DasMikro 2s6a (I know the last batch had a tendency to combust, but I'm really hoping this batch are slightly more reliable?)
1x Devo7e - I need to mod it to do the DSM2 thing, though I believe that's "easy"?
20x N20 gearmotors
2x "pink" servos (S306G-HV)
A load of 2s Lipos, 2 charging bags, and a charger, though I still need to find a 12v power supply to cannibalise for it.
A load of a4 sheets of Polycarb in 0.5, 1 and 1.5mm
A sheet of 7075 aluminium, 1.5mm
A load of 2 and 3mm nuts and bolts
OH RIGHT and a NanoTwo.

Obvious things I'm missing: Wheels (I'd like to source or make my own rather than turn to the ToughHubs. I'm thinking Lego wheels? Maybe?), Wiring (I'm thinking 23 gauge?), and switches (simple amazon search should do it).

I also have some jigsaw blades and some old keys, and they'll (hopefully) make sense in a bit.

Now for the fluffier things I have:

Jiggy Sawdust and the Wedgebot from Mars:
So I wanted a grabber. I wanted (at the time) a team of ants all of which used an unmodified tool as their weapon. I've dropped the team tool idea, but Jiggy stuck around.
Similar to a rear-hinged flipper in design, the servo will operate as many jigsaw blades as I have weight for for grabbing. Because I wanted the full Bowie reference, and because each team can have a Cluster, I also hope to make enough weight for a basic wedgebot. From mars.

Key Grip:
So I've done some work in the film game, and will hopefully be doing more work over the next few years.
One of the departments is the Grip department. The HoD of said department being the Key Grip.
So an antweight that uses a key to grip it's opponent?
... Ahem. Yeah. Basically Key Grip is gonna be Jiggy's bigger brother.

I have pictures etc, but the attach file feature doesn't seem to support photos, and I've yet to set up some kinda online hosting thingy to link em with.

Suzan:
Right. Suzan is the least thought out. By which I mean the pronunciation of the name is all I've come up with. The bot won't be called Suzan - I want the name to be a.... one of those word thingies where each letter is an initial for a longer name... an Acronym! Yes, one of them. But I don't have one yet.
I also want not-Suzan to be a Flippah. Front hinged, rear hinged, 4-bar... I'm easy in that regard. What's more important to me is settling on whatever ridiculously over-complicated launch system it's gonna use. I'm leaning towards springs or elastics rather than pneumatics. I know they're a pretty terrible idea in any weight category and that's why there aren't any (Only examples I can think of are the famously unsuccessful Diotoir and the horribly disappointing ABC S2 Lockjaw) BUT just like the flywheel flipper (Warrior Dragon), terrible designs do hold a certain appeal. So I haven't given up on making little not-Suzan yet.

So yeah, that's where I stand right now. Over the next few weeks, I hope to successfully complete at least ONE of these. And HOPEFULLY I'll be seeing some of you at the AWS in February!

(Seriously, what's the most popular way of getting pictures on here?)
Last edited by LimaHotel on Mon Apr 29, 2019 9:03 am, edited 1 time in total.
Jiggy Sawdust (Grabber)
Jammin' Good with Weird and Flippy (Rear-hinged Flipper)
The Pushbot from Mars (Pushbot, under rebuild)

Key Grip (Rear-hinged Flipper, currently out of service)

Derek Dudge
Posts: 131
Joined: Thu Dec 07, 2017 9:32 pm

Re: A Hotel, constructed of Limas, for Ants: A Build Diary

Post by Derek Dudge » Thu Jan 17, 2019 10:56 pm

I like the robot ideas and the themed names.

Couple bits from your post I can answer - yeah the dsm2 thing on the Devo 7e is easy. There is a step by step guide around, iirc it was on Nuts and Bolts website for people buying the older escs that were dsm2.

And for hosting images I just use https://imgbb.com. it's free and doesn't even need an account registering :)
My robots:

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

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LimaHotel
Posts: 132
Joined: Fri Mar 16, 2018 10:30 am
Location: W. Devon

Re: A Hotel, constructed of Limas, for Ants: A Build Diary

Post by LimaHotel » Tue Jan 22, 2019 6:29 pm

Cheers Derek - I'll be sure to check that out when I have pictures to post!
Uuuh, an update. My plan had been to spend this weekend finalising the cad, and hopefully making a cardboard prototype of Jiggy. Unfortunately I'm not sure where this weekend went, but it seemed busy.
As it stands, the only real progress I've made is I can charge Lipos now. Oh, and I have added electrical wire to my large supply of jewelry wire, so that will undoubtedly help with the whole... electrickery thing. And switches. The switches are ENORMOUS for some reason, but I'm sure they'll be fiiiiine. It's not like they weigh anything. I'm also busy this weekend coming, so...
I dunno. Maybe I'll find an evening to do some Sketchup, and maybe I'll find one to do some building. I might actually skip the sketchup - I have components and plenty of cardboard and rough sketches. I might just skip straight to messing around with fit here in the real world.
I also need to actually look up how to LemonRX, DasMikro, etc. I have no doubt I'll understand it - this ain't my first electrickery - but it is my first RC.
I still have EVERY intention of attending the February AWS!
Jiggy Sawdust (Grabber)
Jammin' Good with Weird and Flippy (Rear-hinged Flipper)
The Pushbot from Mars (Pushbot, under rebuild)

Key Grip (Rear-hinged Flipper, currently out of service)

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LimaHotel
Posts: 132
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Location: W. Devon

Re: A Hotel, constructed of Limas, for Ants: A Build Diary

Post by LimaHotel » Sat Feb 16, 2019 12:07 am

Hahaaaaa! I've finally done something!
Went to see a friend, and together we actually sat down and worked out this whole pesky knowing what we're doing thing. Huge thanks to T_Y for help with the mixing on the Devo7e!
Uuuh, so right now I have all the wiring done for Jiggy, though no shell made, I've redesigned key grip to be more of a flipper with the keys above kinda like the horns on... Uuuh... Termite something? The blue antweight that's great at picking up opponents on it's flipper and pinning then against the horns it has above. In my case those will be keys, but the idea is the same.
What I've actually built is a 4wd pushbot- and it does theoretically fully work fine! I'll upload pictures once I'm home and hopefully once it has wheels. Fun fact : silicon sealant does not a good tyre make.
I reeeaaaally want to avoid the toughhubs / anything 3d printed. I know it would just be BETTER, but I just wanna source my own wheels somehow and I'm running out of ideas.
ANYWAY yes! Things have happened! I have a robot that works! I'll be coming to the AWS! WOOO!


Oh, the pink servos BTW. What degree of motion are you meant to get from them? Plugged straight into the rudder pins on my lemon, I'm getting less than 90 degree movement and it's sitting neutral in a really annoying place, though that's easily fixed by just unscrewing the arm and fixing it in the neutral orientation I want. Is it possible to do any degree of customising with the devo on that, or is it just trims / offsets?
Jiggy Sawdust (Grabber)
Jammin' Good with Weird and Flippy (Rear-hinged Flipper)
The Pushbot from Mars (Pushbot, under rebuild)

Key Grip (Rear-hinged Flipper, currently out of service)

Kyro
Posts: 156
Joined: Fri Jan 18, 2019 12:36 am

Re: A Hotel, constructed of Limas, for Ants: A Build Diary

Post by Kyro » Sat Feb 16, 2019 2:58 am

never used a devo, but look for a setting called end points... make sure its on your rudder channel and see if you have any extra you can give it... my tx came with end points set to 100 but i can push it to 120 in both directions... if its a mechanical restriction (the servos wont physically move beyond where they stop when manually rotating them (not really advised to do too often as it can damage the servo)) then you might want to remove the mechanical stop... this is usually a plastic block on one of the gears which can usually be removed with a sharp knife... if its a metal one, a file works in most cases...

hopefully you find something useful...

although an expert on a devo might be able to guide you better than i

good luck
Team Rocket Robotics
Esper(4wd flipper)
Mantis (2wd control bot)
Dominus (4wd flipper)
Twinzer (L&K) (cluster)
Remembering Rex (antweight cassuis)

Sometimes, i wake up grumpy... other times i just let her sleep in...

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LimaHotel
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Location: W. Devon

Re: A Hotel, constructed of Limas, for Ants: A Build Diary

Post by LimaHotel » Mon Feb 18, 2019 11:47 am

Yo, so I've dug out the old rubble sack of Lego (I promise there WILL be pictures of things!) and my plan had been to just epoxy lego wheels straight onto the n20 axles, though I'm no realising that would be a terrible idea.
I do have access to a 3d printer (Not a clue what it prints in - probably just PLA) - does anyone know where I might find existing designs ready to print that would accept a Lego 30.4 x 14 VR tyre?
(One of these https://www.google.com/imgres?imgurl=ht ... t=c&ictx=1 )
Cheers guys
Jiggy Sawdust (Grabber)
Jammin' Good with Weird and Flippy (Rear-hinged Flipper)
The Pushbot from Mars (Pushbot, under rebuild)

Key Grip (Rear-hinged Flipper, currently out of service)

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LimaHotel
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Joined: Fri Mar 16, 2018 10:30 am
Location: W. Devon

Re: A Hotel, constructed of Limas, for Ants: A Build Diary

Post by LimaHotel » Tue Feb 19, 2019 5:59 pm

The Pushbot from Mars!
A little unrefined, works though. No idea what it weighs - need to buy some scales.
Wheels are blutacked on, but surprisingly solid. Still need a more permanent solution.

Image
Last edited by LimaHotel on Sun Apr 07, 2019 11:03 pm, edited 4 times in total.
Jiggy Sawdust (Grabber)
Jammin' Good with Weird and Flippy (Rear-hinged Flipper)
The Pushbot from Mars (Pushbot, under rebuild)

Key Grip (Rear-hinged Flipper, currently out of service)

User avatar
LimaHotel
Posts: 132
Joined: Fri Mar 16, 2018 10:30 am
Location: W. Devon

Re: A Hotel, constructed of Limas, for Ants: A Build Diary

Post by LimaHotel » Tue Feb 19, 2019 6:12 pm

Image
Image
Image

Also, if I'm right then there should be enough weight to add a self-righter, possibly make the wedge a flipper. If not, it's riding VERY high. What I should do is make another shell where the motors are mounted higher up. That way it should be invertible.
Either or, this was mostly just getting the learning out of the way. I now know what things do! Building shall shortly commence on Jiggy.
Uuuuh... So that 3d printer I mentioned btw. Can't access it. Not in time. So for the here and now... I might end up just using the epoxy. If I oil the shafts or have a layer of clingfilm, it should let me remove the shafts from the epoxy. Then to get a friction fit... I dunno. If it needs anything then... Layer of tape?
It's an idea. I'm open to any people have right now!
Casualties of War thus far btw? 1x motor gearbox, and god knows how many nuts&bolts. Fun!
Last edited by LimaHotel on Sun Apr 07, 2019 11:05 pm, edited 1 time in total.
Jiggy Sawdust (Grabber)
Jammin' Good with Weird and Flippy (Rear-hinged Flipper)
The Pushbot from Mars (Pushbot, under rebuild)

Key Grip (Rear-hinged Flipper, currently out of service)

User avatar
LimaHotel
Posts: 132
Joined: Fri Mar 16, 2018 10:30 am
Location: W. Devon

Re: A Hotel, constructed of Limas, for Ants: A Build Diary

Post by LimaHotel » Wed Feb 20, 2019 1:53 pm

Brain is built for Jiggy - thanks for suggesting looking for end points. The devo didn't have anything there, but in mixing I found scale and turned it up to 125. Clean 90degree motion accomplished!
Jiggy Sawdust (Grabber)
Jammin' Good with Weird and Flippy (Rear-hinged Flipper)
The Pushbot from Mars (Pushbot, under rebuild)

Key Grip (Rear-hinged Flipper, currently out of service)

User avatar
LimaHotel
Posts: 132
Joined: Fri Mar 16, 2018 10:30 am
Location: W. Devon

Re: A Hotel, constructed of Limas, for Ants: A Build Diary

Post by LimaHotel » Fri Feb 22, 2019 11:33 pm

Image
Image

Key Grip!
Uuunfortunately he's kinda overweight. 7g with no wheels. The key is 12... I think I may need to lose the key tomorrow morning after getting to the event. There's also plenty of room for drilling holes in polycarb, and the 7075 titanium on the bottom of the flipper isn't needed per se.

I have 2 of 3 machines ready in time for aws tomorrow! Now to get some sleep before setting off at 5am...

Oh, I've given up on the wheels for now. Bought some toughhubs off shakey and I'll get them off him tomorrow at the event. Shame - I do want to use these Lego wheels. I think I'll need to design an entire hub to print though. Ho hum.
Last edited by LimaHotel on Sun Apr 07, 2019 11:06 pm, edited 1 time in total.
Jiggy Sawdust (Grabber)
Jammin' Good with Weird and Flippy (Rear-hinged Flipper)
The Pushbot from Mars (Pushbot, under rebuild)

Key Grip (Rear-hinged Flipper, currently out of service)

Kyro
Posts: 156
Joined: Fri Jan 18, 2019 12:36 am

Re: A Hotel, constructed of Limas, for Ants: A Build Diary

Post by Kyro » Sat Feb 23, 2019 3:40 am

glad i could help with end points... i will see you tomorrow...
setting off at around 6:30 myself...

best of luck tomorrow...
may i suggest (if you see this in time) trimming down your power switch to the point where its hard (but not impossible) to switch off by hand... this may save a gram but mainly itll help prevent an opponent switching it off during a battle...

Luke
Team Rocket Robotics
Esper(4wd flipper)
Mantis (2wd control bot)
Dominus (4wd flipper)
Twinzer (L&K) (cluster)
Remembering Rex (antweight cassuis)

Sometimes, i wake up grumpy... other times i just let her sleep in...

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LimaHotel
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Re: A Hotel, constructed of Limas, for Ants: A Build Diary

Post by LimaHotel » Mon Mar 04, 2019 1:44 pm

Okay, I am LATE writing this here.
AWS57 was FUN. It has me absolutely hype for whichever event I can make next!
After AWS I kinda ran straight off to London for a quick job that was going, then Brighton, Cambridge, then finally home last night. I'm stir crazy already.
So. Long overdue writeup:
I had 6 fights in competition, 2 more than I expected! Shakey's wheels (Ye, I capitulated) are impressive things, and got my two one-day-build, barely planned "competitors" rolling.
My first fight was actually the second fight of the event. Pushbot vs a fronthinged flipper - sorry, I'm TERRIBLE with names of people, let alone robots. It... was over quick.
Let's be honest here - Pushbot is not invertible, can't self right, was essentially the rolling chassis I made with a friend so we could work out the electronics. ALL I wanted from Pushbot was for it to face a few spinners so I could test out it's durability / the construction quality of my builds.
The fight also highlighted one other thing that I kinda already knew - my bots are SLOW. Somehow, my N20s are 300rpm 12V 30:1 motors! I could've SWORN I'd ordered 6v 500rpm ones. I have now. My next showing should be a little more up to speed.
Fight 2: Key Grip vs Tom Brewster? Oh my god it's Tom Brewster? It's one of Harry's ants if I recall correctly.
Quick note on Key Grip - I had to remove the key. It weighed 12g, and Key Grip was sadly 12g overweight. So I had nothing to stop robots going straight over the back, and Key Grip couldn't self right without the key.
Well. I lasted longer. I proved that I can tape some acetate to a wedge to get a good, low ground clearance, and that the flipper works. Other than that, I was very slow due to the essentially 150rpm motors, and he ran circles around me. I eventually wound up in the pit.
Good start team! I expected nothing less!
My next fight was Key Grip vs Zero. I'd just been talking to George, effectively fanboying over his BEAUTIFUL team. I thought: This is it. It's over.
So... Zero's plate at the front is double lipped. So it can break a ground clearance either way up. It also meant that my flipper on Key Grip could get a hold of the top lip of Zero's plow even if I lost the initial ground clearance. Initially, with Zreo's wheels being at the front of the bot, once the nose was off the ground, George had no means of control. I was shocked to see myself drive Zero into the pit - OHMYGOD I WON SOMETHING!!!
Next up was Pushbot against... NAMES DAMNIT! Some kinda white bitey bitey grabby grabby thing. Not a spinner. Damn. Pushbot was gonna go home without testing himself against a spinner.
... Or not? I totally lost the fight, but my opponent wound up in the pit! Pushbot, by the skin of it's teeth, goes on to fight another robot! Please can this next one be a spinner? Please?
Key Grip returned next for an epic showdown against Sprat Bait. Once again, low speed motors left me totally unable to match the driving of my opponent, and I was not the one controlling the fight. There were a few close calls, but eventually Key got stuck on the wall of one of the corner zones and, in attempts to free itself, landed on it's face. In the video you can hear me say "It can't self right without the key!" and there, sure enough, it chomps and claps away but does not self right. Key Grip is OUT
Pushbot, how the hell did you reach a later stage of competition than Key Grip? This isn't right!
Anyway. You're fighting a spinner now, right?
HAHAHA no.
Test Your Metal once again totally outdrove me (though I nearly got him in the last 4 seconds) and we essentially had a fun game of me driving over the top of TYM repeatedly. For 3 minutes. I lost on a judges.

And so ends the competition for me. Not to worry, I still have the rumble! Maybe Pushbot can take a hit yet!

I go straight for Vampire, but he's in the pits before I can get to him. Then I try to beeline for Chaotica, and get bullied a little on route By the time I get to Chaotica, he's upside down. I feel a little disappointed at this, and push him (and Vampire who somehow showed back up) into the pit. Right, okay. Tim Rackers is still around somewhere... HE'S STOPPED SPINNING WHY
Shortly after that Pushbot was upside down and I presumed out. SOmeone turned me back over just before the pits were cleared though and despite being stuck half in the pit, I was deemed still mobile? RESULT!
Being a cheatey cheater, Tom took this opportunity to put the drive belt for the spinner back on Tim Rackers. Or at least I think that's what happened? I might be being entirely unfair here. If so - Sorry Tom! Anyway, when the fight resumed, Tim Rackers was spinning again. I took a hit! I took a hit! Then Tim Rackers was in the pit. WHY JUST LET ME GET BEATEN UP PLEASE
I then, probably through simply being a low threat non-priority target, made it to the top 4. Hahahaha, because I totally deserve that.

I was gutted to miss the spinner firing squad - that would've been perfect for Push! But watching it, the squad kinda SD'd anyway, so y'know.

After the event had "finished" I did get in a couple of whiteboards. Finally. George with Vampire took a few bites out of my face then flipped upside down, was too low on charge to self right, so... hang on... Pushbot beat Vampire! That's... not the result I was hoping for, but WOOOO
I also got a fight in alongside Cannon Fodder against a big vert - can't remember the name. That one I did not win, but I took a few more hits and I am pleased to say - Pushbot is structurally sound. Sure, a gearbox got completely exploded at some point and one of Shakey's wheels got mangled, but all in all I reckon that's a pretty good result for build strength. I'm happy!

Both Key and Push have full rebuilds in the works (Key will be smaller AND HAVE A KEY and Push will be invertible and both will use lego tyres on hubs that Carl, driver of Mini Concussion and utterly awesome for this - thanks man!, linked me to. I also need to actually build Jiggy. I'm slightly concerned about the weight of the Jigsaw blades (and also the now limited supply of the pink servos) so... a grabber doesn't need to be quick like a flipper so much. I might buy a lighter, slower servo for Jiggy.
Next AWS is in June, ye? Here's hoping I won't be working and will be able to make that one!
Jiggy Sawdust (Grabber)
Jammin' Good with Weird and Flippy (Rear-hinged Flipper)
The Pushbot from Mars (Pushbot, under rebuild)

Key Grip (Rear-hinged Flipper, currently out of service)

User avatar
LimaHotel
Posts: 132
Joined: Fri Mar 16, 2018 10:30 am
Location: W. Devon

Re: A Hotel, constructed of Limas, for Ants: A Build Diary

Post by LimaHotel » Mon Mar 04, 2019 2:33 pm

after a little browsing Hobbykinjg, I'm thinking some Hextronic MG-14s would do? 14g (so 6g lighter than the Pink servo), 2.6kg torque, 0.11s 60 degree rotation time... it's on the slow side next to the pink servo for sure, but reviews are solid and the price is low. Should work for a grabber, right?
Jiggy Sawdust (Grabber)
Jammin' Good with Weird and Flippy (Rear-hinged Flipper)
The Pushbot from Mars (Pushbot, under rebuild)

Key Grip (Rear-hinged Flipper, currently out of service)

User avatar
LimaHotel
Posts: 132
Joined: Fri Mar 16, 2018 10:30 am
Location: W. Devon

Re: A Hotel, constructed of Limas, for Ants: A Build Diary

Post by LimaHotel » Tue Mar 05, 2019 11:09 am

Jiggy Sawdust (Grabber)
Jammin' Good with Weird and Flippy (Rear-hinged Flipper)
The Pushbot from Mars (Pushbot, under rebuild)

Key Grip (Rear-hinged Flipper, currently out of service)

User avatar
LimaHotel
Posts: 132
Joined: Fri Mar 16, 2018 10:30 am
Location: W. Devon

Re: A Hotel, constructed of Limas, for Ants: A Build Diary

Post by LimaHotel » Tue Mar 05, 2019 11:13 am

Oooooh, actually whilst I'm here - does anyone have experience with pinless Lemons? I'm looking at them and they seem a no-brainer, right? Save weight and more importantly SPACE - but binding... With no pins for the plug what, do I just solder a wire across the terminal and the ground on the Bind rail, bind it, then desolder?
Jiggy Sawdust (Grabber)
Jammin' Good with Weird and Flippy (Rear-hinged Flipper)
The Pushbot from Mars (Pushbot, under rebuild)

Key Grip (Rear-hinged Flipper, currently out of service)

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