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I've only been to one event and I lost every fight. ..badly aha
It's great seeing robots still being built from household materials, it shows others that you don't need anything fancy to get involved, even if you never win a fight you can have fun.
Nothing to be worried about with lipo's if they're treated with a bit of care, understanding them is relatively easy too, take the lipo I've been talking about as an example. It's capacity is 1000mah and it's 25 - 50c, you multiply the c rating by the capacity, so it can supply 25a constantly and 50a peak for a few seconds.
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Well done a bit more, weighed everything and it comes to 1.2kg which is a relief. Got the bug for the pretendo-bot thing so took some snaps to stick up to give anyone interested a bit of an idea of how things are progressing. Obviously is a bit ramshackle given my fabrication skills lol and needs everything mounting and wiring with some holes for the wheels.
http://i174.photobucket.com/albums/w...ps3af50ca9.jpg
http://i174.photobucket.com/albums/w...ps1ccb8b1f.jpg
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You could make that like half the size. So much empty space!
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Giant battery is giant, looking good though. Hopefully I get to fight it at the event on the 28th.
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im building something similar only diffrence being the scoop and i wil be 6 wheel drive...should be an intresting duel i will need to practice my driving
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Yeah i have another scoop I made over the weekend made from steel but it's stupid heavy and didn't really fit lol. The battery is a bit over kill, might try and get an SLA in the next one lol :)
It looks massive in the pictures now I've posted them but it's only a bit bigger than my hand in real life.
I've developed this weird logic in that I reckon there won't be any decent hammers at 1.5kg, so you're better putting most of your weight into perimeter Armour to fend off spinners. (not quite sure where ally angle fits into this like). I bet trying to get 6x6 into 1.5kg is hard work!
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You're right there, it's unlikely you'll get an effective hammer/axe at this weight. Alu angle will get torn up pretty quickly at the thickness you have it, 10mm hdpe would stand up no problem to pretty much all spinners, you may even get away with 10mm chopping board.
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im building mine out of hdpe to be a high speed brick i recokon 1jk hitting people at top speed will upset something inside
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I had the angle ally kicking about in my "random stuff for robot building" stock pile so decided to go with that. If it really will get shredded in the first ten seconds I suppose I'll have to buy something.
Don't have a clue what 1kj is in real-life momentum but it sounds like a lot! I reckon my robot would be about a medium-ish thud given the motors I have :)
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I'd be surprised if you get a kj of energy from just ramming someone, Lynx at 10, 000 rpm with a 350mm bar was hitting around 1.2kj and that's big for a beetle spinner.
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Your beetle weight would have to be traveling at 80 miles per hour and stop completely on impact to give 1kj of energy!
Kinetic Energy= 0.5*mass*(velocity)^2
So velocity = Sqrt(KE*2/mass )
= Sqrt(1000*2/1.5)
= 36.5 m/s
= 80 mph
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I saw suvv write 1jk of energy and read it as 1kj. I think he meant 1 joule abbreviated to 1jl but instead typed 1jk. 1 joule is 1 newton acting to move something a meter so that would make more sense lol. It's me that's written 1kj sorry :)
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That would give 2.5mph, bit slow but sounds about right for a beetleweight
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umm actually that was my dislexcia kicking in i meant to type 1kg and i think i had a special moment sorry folks although i loved the maths
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lol don't worry :) I have a "dave second law of beetle spinner impacts" in that I don't think the energy transferred is actually that bad. I mean this in that although the mechanical calculations show a daft amount of energy upon contact with a disk or drum, the robot being hit isn't a fixed target. I mean this in that if you screwed 5mm plated steel to a wall and drove 720 into it it would put a nice big gouge in it. But then if you mount the same plate on another robot, a lot of the energy goes into throwing away the other robot. When you watch the beetle spinner fights there is clearly so much energy there, but upon contact with 1kg not being that planted the result ends up in glancing blows. The second law of beetle spinner impacts makes me feel a lot better about my ally angle :) When I bring my robot home in a binbag on the 1st March I will no doubt change my tune :D
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im preparing for my first bot to explode on impact with any of the spinners
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and also isnt the rule with spinners that they do as much damage to themselfs as to the target
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The forces they have to cope with are the same yes, obviously the opposing robot is being hit with something so will take more superficial damage. The first version of Lynx basically destroyed itself at half speed because it couldn't handle the forces it took during an impact, however it also had enough energy at half speed to get through g5 Ti.
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Struth I'm back to cacking myself again
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"Good point, looks like we do not stock the 4mm version which we will rectify on our next delivery which is likely to be 4 weeks time. Apologies for the confusion."
^about adaptors to save cluttering up the ranglebox thread
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Yeah that was the response I got lol. Hence pecking about fingertech adapters. The fingertech setups are so much nicer than the pololu stuff it's just a case of having the time to wait for spares. If Ellis could stock it and also some featherweight casters with nuts melted in I'd be his biggest customer lol. Also drill mounts and all that kind of stuff. Someone also needs to start selling removable links premade as well, I'd buy a ton of them.
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Well realised everyone was right and there was no way on gods earth I was going to get robot in weight. I decided to trim it right down and now the finished body is 800g. Also got motors and wheels etc. together so that was good. I have a scoop thing to go on the front. Am massively daunted by the other beetles and ummed and arred about calling it a day at the weekend. My girlfriend persuaded me to at least finish the body and running gear. She's right when she says it doesn't matter if you're amazing at something, if you're having a laugh keep having a go. So...to this end I've put a couple of pictures up. Tomorrow is going to be a case of cutting slots top and bottom for the wheels to poke through and putting the front wedgyprongthing on. Then in the afternoon put electrics in and cable it all.
http://i174.photobucket.com/albums/w...ps8c50f594.jpg
http://i174.photobucket.com/albums/w...ps31d6b720.jpg
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Your girlfriend is right you don't need to build a super incredible machine to have fun, it actually looks quite strong so you might be surprised. Cover the sides with something to protect to Alu angle and you'll be fine, some hdpe would absorb the hits from spinners well enough, got some 3 or 6mm stuff if you want me to bring it to the event.
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looks good mate im hopefully gona get started on mine soon now that i have all the major components and my plastic has arrived look forward to meeting you in the arena
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Thank you for the offer of the hdpe but should be ok, if I get stuck will let you know :) And thanks for the nice comment suvv look forward to seeing yours too. Found some more ally bar in a bin at work so made a prongy thing. And used a cordless drill to make wheel holes top and bottom. It looks like a load of rubbish.
http://i174.photobucket.com/albums/w...psol9gwaib.jpg
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i made my first prototype out of cardbord mate and it looked like a 3 yr olds attempt at a bath or something no shame in something starting out looking sketchy with the reliability issues of past beetles i have been told about you stand as much a chance of winning as anyone else just remember that the first uk robot wars champ was a load of old road signs and an electric wheel chair
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Looking good, Lynx is almost done too just needs it's weapon bar , hopefully see you in the arena.
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You can leave the bar off if you like :)
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Looks nice and seem quite fast :)
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Cable ties, a roboteers best friend. It does look nice and fast and unlike Lynx...It's working!
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Lol if you get it going lemme know and I'll shove some bin bags in my tool bag... :D
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Won't know until tomorrow at the event whether it works or not, if I can scrounge an rx from someone it should. Bin bags may be necessary for me, it may well explode.
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You're welcome to one of my naff spare radio link rx's. I dunno if it will work with which ever specific tx you have.
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That'd be great, I'll see if I can find the specs online and see if it's compatible.
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Yeah no worries. I kept cooking them in my antweight till I realised I was wiring the power in wrong. So I have a stack of them lol. Bringing everything with me in the morning so will come and say hi. Will be the sweaty looking one with trackies and a hoodie on lol. So can't be bothered having a shower at half 5 in the morning when I need to set off!
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stick a weight on a bit of cable and with that spin speed it will make a very nice flail type weapon and it wont be that complicated to do
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I took a couple of pictures so thought I'd stick them up. Robot ran well in it's one fight and took a battering and was running at the end of the bout so it's been a huge confidence boost. Starting building Rancid 2 last night based on a completely ally body properly fabricated (ish) with decent wheels and new electronics. Took the day as a huge learning curve looking at all the other robots and had a fantastic time. Wanted to say a big thank you to limpet, Will and john_frizell for chatting to me and being friendly :) Am eagerly awaiting sign ups for the next event and think I may become a regular at the iron games :)
http://i174.photobucket.com/albums/w...ps7iakbdk4.jpg
http://i174.photobucket.com/albums/w...pskuhai6ct.jpg
http://i174.photobucket.com/albums/w...psftnzitvr.jpg
http://i174.photobucket.com/albums/w...psep9lccvh.jpg
http://i174.photobucket.com/albums/w...ps9hiyj6sh.jpg
http://i174.photobucket.com/albums/w...psim6oqha6.jpg
http://i174.photobucket.com/albums/w...psj2oywzkt.jpg
