Team Shakey - Axebot

So my emergency Maidstone robot (An adorable Kitten) was pretty fun and seemed to get a few laughs despite my fear of Major Damages new flamethrower, but I need a proper robot. So (Since I never posted any) this was AAK after the Maidstone event feeling worse for wear.

http://i685.photobucket.com/albums/v...t/SDC11966.jpg
And the absolute mess of wiring:
http://i685.photobucket.com/albums/v...t/SDC11967.jpg

And I am replacing it with an Axe feather weight.
The plan is a Speed 900 powered Axe (Driven by a H-Bridge), 2 gimson 18V 36:1 GR-02's on 75-100mm wheels, 2 electronise speed controllers (Taking them out the old robot), 6S LiPo. All packaged in a 5mm steel shell with Polycarb top and lights... lots of nice lights.

Some initial Pictures:
http://i685.photobucket.com/albums/v...t/SDC11969.jpg
http://i685.photobucket.com/albums/v...t/SDC11970.jpg
http://i685.photobucket.com/albums/v...t/SDC11971.jpg

The axe mechanism was provided by Maddox and is nice and light. The axe head is quite a nice bit of high carbon steel, the spiked side seems to breeze through HDPE without much effort. I plan to have it so I can turn the axe head around to have either the flat or pointed edge as my 'Attacking' swing.

The robot will have blue lights so I can see where it is in the arena, but for the audiences fun whenever I fire the axe it will flash to the red LED's.

Cheers,
Shakey

Now the rest of the machine...

Indeed, everything has been ordered. Just twiddling my thumbs waiting for the postman.

*cough* Well I think I thumb twiddled long enough. In the buildup to The Fleet air arm museum where I aim to be running this I have been getting a good deal of work done.

I have the rear armour on, a battery box made up and the front armour and small scoop started.
http://i.imgur.com/lb1zIvO.jpg
http://i.imgur.com/2TBzUu0.jpg
http://i.imgur.com/9peDWBJ.jpg
http://i.imgur.com/f7IGQnC.jpg

I was planning to slope the front armour but I decided that in reality I wanted a different chassis design but am finishing this one for Air Arm so i can have a robot and then spend more time on a proper chassis after. The axe will be controlled via an Arduino and a TZ85 with motor braking removed, it will also use the gear channel of my DX6i to remotely arm and disarm the axe for safety (particularly in roaming robots where the link would be put in outside the arena).

The scoop will be fairly short, the aim would be to wedge it under an opponent and then fire the axe sandwiching the other bot between the two, but if it can't get under I should still be able to hit them.

Just got to finish the front and then the extra side armour. Add in a HDPE 8mm top and then wire it all up.

EDIT: I am actually looking for a more powerful drive system for the next iteration, what sortof thing would one have to do nowadays to get S900esque drive but not S900's as they are near impossible to find.

I haven't ground down the welding on the front yet.

Getting a tonne of work in to try and get this running before yeoville.

Chassis is very nearly done. Just some brackets here and there to be added. I switched the battery box to the other side and turned the axe around. Slightly less rotation but it means it is 'in' as it were when the axe is back so I should be less vulnerable and drive a bit better. Also means that the axe may struggle with taller robots. Also gave it a quick spreay as after loads fo grinding and weld splatter it was looking a bit rough! The Arduino controlling the axe will sit above the two TZ85's that are next to each other and the receiver will be there aswell.

http://i.imgur.com/2WN9aOT.jpg
http://i.imgur.com/mAUkRYH.jpg

I changed the wheels to a pair with a larger diameter to sort out a slight grounding problem and also to improve grip. Now to add a lid and backstop then wire the thing up!

It isn't pretty but for a second feather *cough*third*cough* (first never saw combat) it's alright, and a huge improvement on the first one I competed with which had 2 out of 4 motors working after just a few fights.

Though my day trip to Gadget Show Live and watching the champs leaves me a little scared :P

You'll be fine Alex :)

Gimli did quite well at the Fleet Air Arm museum!

The axe performed better than I expected leaving a few dents about and putting a few holes in Richie :D Some noise issues to be worked out though. Managed to win 3 of my 7 fights including pitting another robot which I was pleased with. Had an axe off with LH3 though got stuck upside down (was against the sidewall so no self righting) and attempted to take on Beauty but suffered a failure in one of the GR02s powering the drive (bike tread came of the wheel jamming the wheel and stripping a tooth in the gimpson, this then blew the motor). I have repaired the motor using an old GR01 and have improved the securing of the bike tread on the wheels.

http://i.imgur.com/ekUdn7O.jpg

Going to work on the scoop a bit so it can be more effective and on the lid. I'm going to try and improve cooling inside the robot aswell. I got a few suggestions on how to improve the axe control like using a polulu board with the arduino.

The event was great, one of my favourites. Nice and relaxed with plenty of time to socialise and look at the other robots. The arena under Concorde made for a great setting with an interested bunch of onlookers. If anyone has videos or pictures for the event any links would be greatly appreciated! Especially a picture of Stanley and Lionel (two antweights) going head to head in the arena.

Spent a bit of time improving the front scoop part of Gimli to hopefully help it out in combat a bit:
http://i.imgur.com/VnDx9IL.jpg

Started looking at taking the noise out of the axe system so I have better control of it as well. Added some reinforcement to the side triangles which stop people ramming my wheels front on. The rebuilt drive motor works but overall the drive train sounds a tad rougher. Starting to look for alternatives to the GR02's, not overly impressed by their reliability. The nuts on the inside of the battery cover have now been arc welded in place (Interesting task arc welding something so small), no more nuts falling out in fight, the lid also now has the full 3 bolt complement holding it on.

Also while stripping the axe down to work on the robot I found the ali gear in the middle was already showing some damage to the teeth so I am going to order a steel gear to replace it with (I can afford the weight).

Damn, that's a lot of thumb twiddling!

Well I decided after a good performance of Gimli at Guilford, even managing to put a few holes in bots, to give it a spruce up. So the electronics inside was seriously neatened up. The robot given a nice paintjob and 2 new headlights so it can find it's way around the arenas and see what it is hitting!

http://i.imgur.com/lXbe2aA.jpg
http://i.imgur.com/YGEmSgu.jpg

I only need to remount the power LED next to the link, mount the link properly and add in limit switches and Gimli won't need any work other than maintenance for fighting.

Although a quite urgent matter of having to replace the ali gear in the axe drive is apparent. It is getting absolutely mashed from the continual shock of hits. Hopefully I can get a steel one and get on a lathe and switch it out.

Like this :) Which voltage do you run the axe on? I'm not very good at working out LiPo voltages...

Need to put up a photo of the tidy wiring :L

Quote:

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Originally Posted by daveimi

Like this :) Which voltage do you run the axe on? I'm not very good at working out LiPo voltages...

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6 cell so at the start of a fight it'll be 25.2V (About 24V at the end). Quite overvolted and the S900 is always quite warm at the end of the bout. The drive is only allowed 60% power right now to stop it dying under the overvolt.

I'm currently trying to think of something I can do to make a heavy out of this:
http://i.imgur.com/nX98kaX.jpg
Anyone got any ideas?

I also started on a small ant arena aswell for lugging around to uni for testing and maybe smaller meetups with a few people. It's not huge by any means but just enough 2 ants can get a decent fight in. I'll also be doing a few things to stop it being so easy to 'pit' opponents. I'm going to use captive nuts to make putting it together and taking it apart easy. The screws are all countersunk and the top sanded so no ants can catch on them either. It stores quite nicely aswell which is going to be handy :D
http://i.imgur.com/qFlyYQE.jpg

I also have a few windscreen wiper motors and a powerful bosch seat motor setup with a gear I might be able to use for a good 4 bar lifter.

I finished my testing arena :D It's just big enough for 2 or 3 ants to have a rumble but the obstacles and layout should make fights more interesting. For a start the two ants don't start with a straight line to each other and there is minimal dropoff. The arena benefits flippers, grabbers and spinners really. :D It's a full polycarbonate front and lid too!


http://i.imgur.com/gvBJOZo.jpg
http://i.imgur.com/kkGRkYC.jpg
http://i.imgur.com/Jgnqnhy.jpg
Start positions:
http://i.imgur.com/FdYIXOY.jpg


And Gimlis new steel gear to replace the ali one arrived. The ali gear is completely wrecked from the axe firing expecially after I finally ironed out all the bugs and got full power. I missed one of the targets during testing and it cracked a concrete slab.... :roll: Just need to get hold of a lathe and machine it right then Gimli should be quite a good bot to have fun with! I've just got to make sure that Gimli and Spur 1 are ready for their 2 events in september.
http://i.imgur.com/KAfJNSP.jpg
http://i.imgur.com/njftH48.jpg
http://i.imgur.com/789i4SF.jpg

Going to be heavy, that steel gear.

I've already decided where I can save the weight. But it was a choice between no axe or a working slightly heavier axe.

So I can't remember if I posted this but I have retired my axe Feather Gimli for now until I can properly sort out the drive. The unreliability is far too great and it was just stressful and not fun to fight with.

I am building an electric flipper (fast lifter) replacement but in the mean time have spruced up old reliable Spur 1.

I sorted out the wiring and switched from electronize to TZ85's (A ESC switch to increase reliability). I am going to add side armour, scoop and some ramming spikes tomorrow. :D

All the electronics are shock mounted on the strip of polycarbonate suspended in the middle of the robot aswell to help stop those pesky connectors coming loose.

http://i.imgur.com/8nHXUzK.jpg

Spur is a pretty fun drive, quite fast and a good pusher. While active weapons are fun the simple fact it just works means it is far more fun to fight than Gimli, no having to constantly think about keeping the drive motors cool.

You're workmate is as wrecked as mine. Which speedo's are you planning on using in the pusher :)

It already has 2 TZ85's tucked underneath the battery!

Some more work!

Now comes with Hardox scoop (Mainly because the bit of metal was the only one in the garage the right size without cutting it :P ), ineffective spikes (they look better though) and two brackets on the sides. The brackets will hold the front of the side armour which is 10mm polycarb. This isn't a full combat robot and this amount of armour should help make it a nice and robust bot for the big featherweight melees.

http://i.imgur.com/fI0hMd9.jpg
http://i.imgur.com/nu7kAw8.jpg

It certainly drives better on the TZ85's now I can unlimit it and after I tightened the clutch on one motor (wasn't fully locked).

Looks a bit like a small King B :)

That looks mean! Great work. Is it intended to fight with spinners or go to the featherweight fights at heavy events. It looks like it would survive an assault from a vertical spinner with only minor damage.

The upgrade were intended purely for the feather fights at heavy events (I know the armour is overkill for that but it would be reliable!). I am getting very tempted to throw it at the champs. By the time they roll around I should have a second feather for if bad things were to happen from all those spinners. I may reinforce the scoop a bit more first though with whatever hardox scraps are left. A vertical hit upwards on the scoop would probably rip it off.

I've finished adding the side armour with some brackets in the middle made of hardox and some 10mm polycarbonate bolted on. Weighing in at 13.59kg it's now ready for fighting again. It should be pretty tough in a fight now and seems to be a good controllable fast rammer.

http://i.imgur.com/d48TUti.jpg
http://i.imgur.com/i9ttUOS.jpg

It seems to have a nice mean cold industrial feel to it now.

https://www.youtube.com/watch?v=2EOtHngz1UI

I am going to apply to the champs, hopefully the bot seems good/robust/reliable enough and with my track record in ants I stand a chance of entry.

That drives really nicely and it looks tough enough for the champs, the polycarbonate sides might not stand up too many spinner hits but other than that it looks great.

I've already cut the spare sides :P They may not stand up too well but it's better than having the wheels hit!

Been a while since I posted an update to the feathers. I've been running Olaf in the live shows for quite a while but it's time to get a feather or two running again.

First up I've ordered some new 550 18v motors to either repair Gimli 1 (retired for burning out too many) and then run it on 5 cell. Or making a fast electric flipper. I've designed some nice 3d printed mounts to hold standard drill motors, I know 3d printing in a feather gets a bad reputation at times but I've been careful and these should be more than strong enough. I've even orientated the prints so the bond between layers isn't under stress.

http://i.imgur.com/idqstEm.jpg
http://i.imgur.com/Wx3zeNG.jpg
Would anyone be potentially interested in some of these?

Also the chosen motor for the lifter, a big very powerful motor that when briefly tested in a lifter before had the power (Also broke the lifter it was atattched to!).
http://i.imgur.com/wRa7uJQ.jpg

Plans for Gimli 2 are being drawn up and can be summed up by saying: DEWALTS!
2 18v dewalts for drive and 2 to power the axe. My aim will be to make an electric axe robot that has good damage potential. The real method of winning with this bot will be to use the drive to slam and pit opponents the axe is on there for fun. I've worked out how to rebuild the 3 speed gearboxes shorter, however I am going to need to machine a new carrier plate for the final stage. I'll be using a combination of 3d printing and milled ali to then house the gearboxes.
http://i.imgur.com/HZoYTPY.jpg

If needed I have recently upgraded my 3D printer to handle polycarbonate and Nylon so can use those for the gearboxes if the ABS isn't tough enough. My plan is ali endcaps with the printing only holding the ring gears in place being compressed between the two.