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Author Topic: Team Brain Damage  (Read 25427 times)

zacodonnell

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Re: Team Brain Damage
« Reply #270 on: July 13, 2017, 07:19:33 am »
Yeah, they're only 1/8". It's what I had weight and material on hand for. Because of the way I packed all the guts in foam I'll probably feed my back end to a horizontal spinner instead of the blade, at least until I can get it slowed down a bit. 

The wedgelet is pretty great, but it bites into my rough OSB floor pretty badly and makes it hard to drive the bot forward. On Jeremy's floor (at least at the beginning of the competition) it should be ok. I can always take it off if it is too annoying.

-Zac

zacodonnell

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Re: Team Brain Damage
« Reply #271 on: July 16, 2017, 06:23:24 pm »
I don't have time for a full write-up for now, but I'll give a quick summary. Jeremy and the Campbells are awesome. The event was a blast (heh) as always and I think pretty much everybody had fun. I was pleasantly surprised to get first place with my bot, which I did end up naming "Plan F".  There was a wedge multibot that ended up doing unexpectedly well by making it to the final in the winners bracket. They schooled me pretty well in my first fight but I managed to beat them in the final. I got a lucky hit on the battery pack against Super Kamikaze the first time I fought him but fared better on the second try. Seven fights in a day with one bot is a lot, but other than a couple of drive motors and a dinged up weapon shaft I took very little damage.

Here are the videos:
https://www.youtube.com/watch?v=BN2h_o1lyNc&list=PLATw5d_vDtZkTdW2VN-Zw1S2WzlQMNzRp

-Zac

zacodonnell

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Re: Team Brain Damage
« Reply #272 on: July 16, 2017, 06:24:00 pm »
I also had some other videos from the event added to my channel for other bots:

https://www.youtube.com/user/robotdesigner/videos

-Zac

zacodonnell

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Re: Team Brain Damage
« Reply #273 on: July 17, 2017, 08:14:08 pm »
Ok, we're going to do these one or two at a time as I have spare time:

Fight #1 - Plan F vs Super Kamikaze - https://www.youtube.com/watch?v=BN2h_o1lyNc
This was a tough first round draw for me. Super Kamikaze bashed me up pretty badly last year and I expected nothing less this year.  His wedge also made it tough for my blade to get a bite and my little wedgelet made it tough to drive.  About 45 seconds in I ended up upside down in the corner and I thought I was in big trouble. Then he charged in and accidentally rolled over his own wedge. This left both of us with pretty limited mobility. The damage to the weapon axle caused the bearings to jam up a little bit which made self righting using my blade very difficult. The motor and controller are so over-spec that they managed it, but there's a little burn mark on the ti shaft where the housing of the bearing was rubbing on it.   I managed to get myself upright but lost a drive motor in the process. SK was bouncing around trying to self right too and I happened to get a lucky strike on his battery pack (despite being unable to really attack on my own) that knocked him out.

-Zac

zacodonnell

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Re: Team Brain Damage
« Reply #274 on: July 18, 2017, 07:38:55 am »
Fight 2: Plan F vs Driving Practice - https://www.youtube.com/watch?v=iYXpeNEpCdo

Fights like this are the reason I tried the wedgelet. The blade I'm using doesn't get much bite unless it can get under somebody, and a smooth wedge is a problem. Right off the bat they teamed up and rolled me over, but since I fixed the blade binding thing I had no problem powering the weapon up to self right. It took some slamming but the motor is very powerful.  Naturally they immediately "jammed me up" again and then in all the pounding I lost a drive motor.  At this point I wasn't feeling very hopeful about the fight.  At the end I decided to spin down so that if they pushed me into the wall I'd bunny hop out, and the gambit worked. I flipped over and took off a tire. Then the other bot came after me and I popped a tire off there too. Still, I wasn't in control at all during this fight and the judges knew it - loss by decision.

At this point I was pretty down on the Kitbots 1000 RPM drive motors I was using. I lost one in each fight (left first, then right). The motors themselves are very electrically noisy, such that even with the caps on them driving around was causing the blade to kick on and off, and when I drive forward it messes with the throttle and I can hear the blade speeding up and slowing down. Mix in the busted gearbox from this second fight and I'm gonig to be looking elsewhere in the future. Kyle pointed me toward some of the ServoCity planetary motors (14:1 and 19:1 ratios) and the boxes themselves look much nicer. I'll probably give them a shot.

Fight #3 vs Land Shark - https://www.youtube.com/watch?v=b4m7H5ZDAdY
I figured I was in big trouble here. I just got beat up pretty bad by a pair of plastic-wedge beetles, so going against the low slung metal wedge of Land Shark was not looking good. I had to leave the wedgelet on, which made the bot drive poorly, but if I didn't get a bite on the wedge I was toast.

Miraculously I managed to get under the lip early on in the fight and then it wasn't nearly as effective as a wedge. That let me go on the offensive until I skiped over the dent and got hung up on the damage. I think he must have been having some battery or drive troubles because he never really pushed me much even when I was stuck on top. We had to be separated twice, but in this fight my drive motors held up the whole time and I was able to gnaw at the sides and back of the bot until time ran out. Win by judges' decision.

-Zac

rcjunky

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Re: Team Brain Damage
« Reply #275 on: July 18, 2017, 02:27:58 pm »
I believe the 22mm planetary gearboxes are stronger then the 25mm spur gearboxes as well. What do other bots run for 6lb drive?
Andrew Burghgraef
Canadian Carnage Robotics

Great Hobbies- Canada's leading retailer of radio controlled models and related hobby supplies

Badnik96

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Re: Team Brain Damage
« Reply #276 on: July 19, 2017, 03:19:40 pm »
I think he must have been having some battery or drive troubles because he never really pushed me much even when I was stuck on top.

your first big hit knocked loose one of the wires on one motor, so i only had one side of drive for about half the match. the motors i was using don't seem to be too happy on 3s either. looking at converting Landshark to brushless for next year to fix that.

was a good match though! i'm just glad you didn't do any super serious damage :P
TEAM IGNITION
FireArrow (Antweight) 23-11
Nocturne (Beetleweight) 5-10 (Retired)
KnightShade (Beetleweight) 0-0
Landshark (Mantis) 1-2

Pennbots 2014 and Bot Blast 2014 antweight champion. Bot Blast 2013 Best Driver and antweight third place.

rcjunky

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Re: Team Brain Damage
« Reply #277 on: August 12, 2017, 12:13:38 am »
With franklin fast approaching, any plans for magneto beyond make it spin again?
Andrew Burghgraef
Canadian Carnage Robotics

Great Hobbies- Canada's leading retailer of radio controlled models and related hobby supplies

zacodonnell

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Re: Team Brain Damage
« Reply #278 on: August 12, 2017, 11:09:56 am »
I don't think I'll have any major mechanical upgrades to Magneato for Franklin. In the two fights where the control system was working properly it performed great. It self-righted reliably, was very mobile, and the trigger worked well.  The only thing I'd like to investigate more in the trigger is the arm position sensor. I would like to polish up the light-sensor mount (instead of the ghetto ziptie setup I did the day before the show) or maybe add an encoder or magnetic switch to the arm so I know when to disengage. I'm thinking something like this might work:
http://www.kr4.us/Magnetic-Door-Switch-Set.html?gclid=CjwKCAjwzrrMBRByEiwArXcw28uN1OJMyRSMGHK-B3yOiD8W8U8roYkwd5VdBZ269X5qd9d7WHPIyBoCNIIQAvD_BwE

As far as the problems getting the flywheel to work reliably, I'm 99% sure that is an issue with the Arduino nano control board. When I was trying to get it to work for Shuttle Launch I spent a few hours trying to debug a complicated failure behavior where it would work if only the throttle was plugged in, but as soon as I plugged the trigger channel into the receiver the throttle would go to zero.  I think something happened to the circuits inside the controller that's causing a bad connection somewhere.  I can just swap the nano out, but I need to figure out what happened. I doubt it was shock loading but it is possible.

My best guess is that it has something to do with electrical feedback from the giant magnet running the clutch. I think it might have eventually toasted my flyback diode and then proceeded to damage the rest of the control hardware.  I don't know enough about electrical engineering to even know how to test something like that. Anybody have any suggestions?  The magnet draws ~5A @ 18v when it is on, and is about a pound of copper windings. I'm guessing there is a very large voltage spike when I turn it off. It damaged one of the little toggle switches I was using during my tests before I put a little diode on the leads. Can somebody recommend a specific diode for this?

-Zac

rcjunky

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Re: Team Brain Damage
« Reply #279 on: August 13, 2017, 12:32:06 pm »
Spec'ing components is something I'd ask Charles about, he can probably guide you in the right direction. Sounds like you're on the right track though if the same board had similar issues in Shuttle as it did at the end of moto.
Andrew Burghgraef
Canadian Carnage Robotics

Great Hobbies- Canada's leading retailer of radio controlled models and related hobby supplies

zacodonnell

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Re: Team Brain Damage
« Reply #280 on: August 13, 2017, 12:37:00 pm »
 The board is definitely damaged. That is almost definitely the cause of the symptoms that I experienced. My trouble is figuring out how it happened and how to make that particular thing not happen again so I can find whatever the next failure in the system is.  Either way it should be fun, and I have a feeling Jerry Clark and it's gonna show me why pneumatic flippers driven by someone with a clue dominate silly fly wheel powered flippers driven by an old-school spinner builder.

Koolaid64

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Re: Team Brain Damage
« Reply #281 on: August 18, 2017, 03:01:52 am »

zacodonnell

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Re: Team Brain Damage
« Reply #282 on: August 18, 2017, 06:36:50 pm »
I'm in now. Thanks for the reminder!

Zac

Koolaid64

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Re: Team Brain Damage
« Reply #283 on: August 18, 2017, 09:31:41 pm »
you had me worried there for a bit
-Kyle

zacodonnell

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Re: Team Brain Damage
« Reply #284 on: August 26, 2017, 10:02:34 am »
Got my tickets in the mail. Looking forward to the event.

I don't think I'll have time to do anything especially interesting this year, unfortunately. Spare time has just not been widely available lately. It's still going to be fun though!

-Zac