Re: 2010 PEACHTREE REGIONAL
 

What a regional!

I would first like to express the amazing professionalism that the mentors have expressed in this thread. Martin Wilson (1771) and Ed Sparks (34) are showing just what this is about. Ironically, Martin won the Woodie Flowers Award last year, and our team "broke", and now Ed has incurred the same fate. Might there be a Woodie's curse?....(insert spooky sound here).

It was very different having the first weekend of matches this year. Thank you and congrats so much to the volunteers, refs and judges for your patience with our teams while we knew you were learning too.

Congrats to all involved, but especially to our new partner/mentee GSMST, Team 3318 for their Rookie All-Star Award!!
Also from our school district, Gwinnett County: 1379 winning the Industrial Design for the sexiest bot, 1261 with an inaugural Dean's List winner. 3 awards and a regional win for our school system is pretty cool!

See you at the Dome!

Re: 2010 PEACHTREE REGIONAL
 

Yep, It's still on our robot (but not for long). It's mounted on a piece of 1/4" polycarbonate that spans two frame struts. I doubt that the breaker had a chance to flex but I'll check things out when it gets home.

Thanks!

Re: 2010 PEACHTREE REGIONAL
 

Breaker failures are not unknown. There were several reported in last year. We even had one that was caught before ship date.

Absolutely - kudos to the volunteers !! They made the best call they could. Especially it being a week one event !!!!!

1771 / 1466 / 1683 flat out had the best game in town next to our b-list robot. We build robots like Georgia Tech does football. Pretty good but not good enough. 1771 rolls into the Peachtree like Alabama or Texas football. Definitely on their game.

Super congrats to the winning alliance. I wish we could have made it a little more tense and closer finish. Enjoy the win.

Our breaker is on the bot and shipping to North Carolina. We are going to replace it. We can bag it for someone to look at or we can take a look at it ourselves. Are you interested in looking at it ? Do you want to see it in Atlanta?

The Dean's List thing is something that concerned me (because of the short notice) but my fears evaporated when the winners were announced. The Dean's List winners are outstanding !! I got to spend some time with one of them at a previous engagement. Outstanding indeed !! Gwinnett county did great and also congrats to CircuitRunners for producing an EI and a Dean's List'er. In their 3rd year of existance and a TON of work Westminster 2415 bagged a Chairman's - Congratulations -well deserved !!

And super Congratulations to Ed Sparks for the WFFA. I was surprised to learn that he was not a prior recipient. Congrats indeed !

Re: 2010 PEACHTREE REGIONAL
 

On the breaker, we should start a different thread in Electrical I think. The breaker problem I have seen in the past is due to a manufacturing error. As the parts are resistance welded, one of the contacts is welded out of alignment. Since the breaker is a bi-metal disk formed in a particular way to stay in contact until heated, this misalignment has changed it's shape. Although it passes testing, slight vibration causes the breaker contacts to separate. As a defect, the problem exists from the very beginning so a breaker that has made it through several matches and practice does not fall into this category. These breakers all fall subject to the tapping of the release button.
The base structure of the breaker is bakelite or similar material. If a crack develops in the base, the parts pull out of alignment inside the breaker and it becomes subject to electrical failure with movement. Hard hits to the robot frame coming off the bump could damage the breaker. Ed Sparks, I doubt a breaker mounted on polycarbonate could be damaged in this way but hardware may have been over tightened or something could have hit the breaker. In reading over the thread again, it was posted that the robot never stopped monitoring +12 volts throughout the match, so I am confused as to the report of a bad breaker.
Ed Barker and others, you can easily open a suspect breaker by drilling through the rivets that hold it together. This will reveal the internal contacts and spring action. If you find something interesting, I would like to see it in Atlanta.

Re: 2010 PEACHTREE REGIONAL
 

I've seen students tighten the mounting bolts so much that the housing of the breaker cracks. This makes me think we could be causing the problem ourselves. I'd like to see some more info ont he best tests for these to weed out potential problem breakers. Perhaps this is something that inspectors could also look for.

Re: 2010 PEACHTREE REGIONAL
 

So it looks like 34 and 1311 both had a main breaker failure on the last match of the finals. What are the odds? There's gonna be a lot of nervous teams in future finals. :ahh:

I'll put future comments on this into the "new thread" when I have some credible data and I will definately disect the culprit when it arrives back in Alabama.

Re: 2010 PEACHTREE REGIONAL
 

Al, when I walked up to the robot after the match, there was absolutely no power on the 'bot. I believe the 12v statement was in error or perhapse true when the FMS first linked (before autonomus). The FMS guys told me that the log shows a disconnect in the 1st second of autonomus. I'm 99.99% sure it was breaker failure.

Re: 2010 PEACHTREE REGIONAL
 

Ed,
I reread the post from Alex on page 2. He said you had power at the beginning of the match but then failed. He also mentioned you had a field provided battery? Is it possible we are looking at the wrong part? Bad battery, cable or connector?

Re: 2010 PEACHTREE REGIONAL
 

Congrats to everybody for an intense three days! I can definitely say I hope we never have to attend another week 1 regional...:p

Congrats to the inaugural members of Dean's List, Team 1311 for KPC and B Entrepreneurship, and Team 1002 for winning EI for the third year in a row! Also congrats to 3318, 1379, 1771, and 1261 (we Gwinnett-ians have to stick together, right? I'm a Norcross kid at heart :D)

Thanks to everyone for their help and support! We were having a ton of robot problems, but received many very appreciated offers of help. Huge thanks to 832 and 2974 for picking us as their alliance partner!!!

Concerning matches: I can't say I watched the last match where this controversy occurred...however, whatever happened happened. There was one instance where we too had to accept a ruling many people thought somewhat unfair, but we're looking forward to the North Carolina Regional where we can compete against some of these awesome teams again!

Re: 2010 PEACHTREE REGIONAL
 

Al,

It's true that we used a field battery so I suppose I cannot completely rule battery or connector failure out. We apparently had full voltage at linkup and then nothing 3 minutes later. I'm still leaning to the breaker. I actually saw this breaker failure happen to another team on Friday (I was on the field as an inspector/troubleshooter).

Re: 2010 PEACHTREE REGIONAL
 

Team 2655 had a great time at Peachtree!
We would like to thank 281 for picking us for their alliance parter, 1379 for being a great second alliance partner.
You guys made our day!
We would also like to thank 2751 for helping us fix our cRio. Thank you so much for volunteering your time!
Also a big thank you to all the judges and volunteers that were very patient with us as we worked through our various robot problems.
Congratulations to 2415 for winning the Chairman's Award and to 1002 for Engineering Inspiration.
As always, you all are awesome!
Also, congratulations to the finalists and winners. Those last few matches were the most exciting of the whole tournament.
Looking forward to North Carolina and perhaps less technical difficulties!

Re: 2010 PEACHTREE REGIONAL
 

congratulations to 1771, 1466, and 1648 on taking the regional!

also congrats to 3318 on Rookie All-Star! we hope to work with you guys next year too!

congratulations to 2415 on their chairman's win! you guys have coem a long way in such a short time, keep it up!

A big thank you to 281 and 2655 for picking us to be on the 8th alliance with them, we had a great time!

and a congratulations to my own team on taking the Industrial Design Award!
by mid-day saturday, the judges had informed us they had nicknamed our robot "the smart car one" :cool:

Re: 2010 PEACHTREE REGIONAL
 

I just reread the post also. His comment about a 'field' battery has to be in reference to team 34 and if I were a good lawyer I'd classify it as hearsay. I'd prefer to defer to Ed Sparks et. al on their battery supply.

Regarding the ref statement about 12 volts - I'm with you there. I don't know how you get a good telemetry stream stating you have 12 volts and then can state there is no power to the robot. I'm NOT throwing the volunteers under the bus. They made their call and I'm good with that. But it don't make sense.

We can't do our assessment until April 1st in Raleigh. I'll quarantine the part and meet you in Atlanta. I don't want to open it until you have had a chance to see the part.

I absolutely don't believe we had a battery problem. We spent a fortune on a new 10 bay Deltran charger and had a total of 6 brand new batteries in our fleet plus 4 from last year. And a couple of students working on power management. We played ONE match per battery the entire weekend. The battery would come out and straight back to the charger. I know it isn't optimal for the battery but we can deep cycle them after the event. Even with all that effort we don't have the S/N on the battery for the failed match. We need to improve that.

One issue we need to inspect is a loose connector to the PD or power switch. That is an open question in addition to the potential defect on the switch.

Don't you love it - great great training ground for the students !!

"Just because it looks like a robot doesn't mean it is a robot." - Ed Barker

Al, BTW - I got drafted as a rookie barely useful robot inspector under the fine tutelage of Ed Sparks. I didn't get to put as much into it as I would have liked but hopefully it helped out. I think I'd like to volunteer to help out in Raleigh. Who do I talk to?

Re: 2010 PEACHTREE REGIONAL
 

Ed,
You were trained by one of the best. If you would like to help out, go to VIMS and sign in for Raleigh. If they have open positions they will contact you. If you work there and like it as much as Ed and I like it, we might need some inspectors in Atlanta.
Do you know what the charge current on the multibay charger is? These batteries get really upset if you charge at over 6 amps. I suspected early on in the build that battery damage from falling off the bumps and other rough handling would be a problem. As you know I want to find a smoking gun on problems like this.

Re: 2010 PEACHTREE REGIONAL
 

As one of those FMS guys poring through the logs, I think (and will verify with FIRST) that the battery voltage being reported is not actually coming from the robot but instead from the classmate. I now think the classmate is reporting the last known voltage it saw. The FMS shows the change in status pretty much immediately when the robot loses its link to the field. At the scorekeeper table, we're constantly monitoring this and when we see it, send the FTA to look more closely. Sometimes it is obvious. When we suspect an issue, we try to get someone to pass the word to the team to look at likely causes. There are a lot of electrical connections on current FIRST robots where any one bad connection can take you down for a few seconds or an entire match.

The match could not have started with the breakers on 34 or 1311 being open. Something clearly happened to both.