Sumo Bots B/C [Trial]

StampingKid
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Re: Sumo Bots B/C [Trial]

Postby StampingKid » April 29th, 2010, 5:36 am

Are lynxmotion body, platform and wheel kits legal?
I WILL RETURN TO PHILMONT IN JULY!
07 Reg 1st BLG, 3rd WV.
08 Reg 1st Twr, 2nd BLG
State 1st Twr
09 Reg 1st WS, PSL and Crave the Wave, 2nd Robo-X, EB
State 1st EB, 3rd WS
10 Reg 1st EB, PSL, 2nd WS, Disease Det., 3rd Traj.
State 1st EB, PSL, 2nd WS, 3rd Disease Det.

gh
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Re: Sumo Bots B/C [Trial]

Postby gh » April 29th, 2010, 2:25 pm

By NY rules, no. I'd doubt Nats would allow kits without modifications either.

Besides, their kits never seemed especially beefy or low to me, at least not at their prices.
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Re: Sumo Bots B/C [Trial]

Postby StampingKid » April 29th, 2010, 6:57 pm

Okay GH. Been reading some of your 2008-2009 posts. Am familiar with Solidworks but how did you cut out the vertical chassis on Harpy? I am a newbie--is there a machine tool? And couldn't you utilize an omnidirectional wheel or bearing in the scoop to take weight off the scoop?
I WILL RETURN TO PHILMONT IN JULY!
07 Reg 1st BLG, 3rd WV.
08 Reg 1st Twr, 2nd BLG
State 1st Twr
09 Reg 1st WS, PSL and Crave the Wave, 2nd Robo-X, EB
State 1st EB, 3rd WS
10 Reg 1st EB, PSL, 2nd WS, Disease Det., 3rd Traj.
State 1st EB, PSL, 2nd WS, 3rd Disease Det.

gh
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Re: Sumo Bots B/C [Trial]

Postby gh » May 4th, 2010, 2:13 pm

Uh, what? Harpy is made from panels cut out of sheets of PETG (an impact resistant thermoplastic). There are tabs and slots and a few t-slots to connect the pieces together. The chassis was not made in one piece. Not everyone has access to CNC mills, and even those who do are often obstructed by other wasteful organizations as well as bureaucracy.

I don't think you quite understand the point behind weight distribution. It's not get weight off of the scoop—in fact, you want maybe 100 grams weight on it to press the edge down—it's to get more weight on the powered wheels doing the pushing. Pushing force is the friction between the wheels and the floor, and that is a function of the floor's force on the wheels in the direction normal to the floor's surface.
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Re: Sumo Bots B/C [Trial]

Postby lllazar » May 22nd, 2010, 3:20 pm

So i volunteered for sumo bots at nats, just got back, DEFINITELY doing this event next year...The top six finalists were:

Fayetville Manlius (spelling errors?)
Ward Mellville
Centreville
New Trier
Solon
Langston

Other than the top two, the rest aren't the exact rankings because the judges still have to score and what not and we won't know 3rd place till the awards ceremony. Few things id like to touch upon:

I can understand two New York teams taking first and second. They had this event as an ACTUAL event...but 2 Ohio teams? Just goes to show ya how good they are...

From what i saw, a good driver was key. This may be obvious but i was surprised to see, especially at the Nats level, drivers who just didn't take advantage of multiple opportunities. Obviously, it's a trial event, but many (most) of the competitors were alternates...maybe the lack of time to prepare as compared to the NY schools who had been doing this all year? However, id have to say the best driver, in my opinion, was the girl from Ward Mellville...If they're bot hadn't had so many mechanical problems throughout the day, i'm sure they would have had better luck.
2011 Season Events~

Fossils (Regionals ~1st) (State ~6th)
Towers (Regionals ~1st) (State ~3rd)
Helicopter (Regionals -3rd gahhh) (State ~5th)
Wind Power (Regionals ~1st) (State ~3rd TIERED!)

Hooray for getting everything i wanted?

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fmtiger124
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Re: Sumo Bots B/C [Trial]

Postby fmtiger124 » May 22nd, 2010, 6:55 pm

lllazar wrote:Fayetville Manlius (spelling errors?)

It's Fayetteville-Manlius commonly abbreviated as F-M
Image

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lllazar
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Re: Sumo Bots B/C [Trial]

Postby lllazar » May 22nd, 2010, 7:15 pm

fmtiger124 wrote:
lllazar wrote:Fayetville Manlius (spelling errors?)

It's Fayetteville-Manlius commonly abbreviated as F-M


Sorry. :(

Congrats on your placing though :)
2011 Season Events~

Fossils (Regionals ~1st) (State ~6th)
Towers (Regionals ~1st) (State ~3rd)
Helicopter (Regionals -3rd gahhh) (State ~5th)
Wind Power (Regionals ~1st) (State ~3rd TIERED!)

Hooray for getting everything i wanted?

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lllazar
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Re: Sumo Bots B/C [Trial]

Postby lllazar » May 23rd, 2010, 12:13 pm

Could anyone explain to me the different electrical parts of a sumo bot? Im really new to this and i have a good design in mind but i just need someone to explain to me everything ill need.

I do know what transmitter/receiver i want to buy, its a vex one...i found one of Ebay for 90 buck, 40 cheaper than on the vex site, and 4 crystals for 50 bucks on the vex site...

Thanks.
2011 Season Events~

Fossils (Regionals ~1st) (State ~6th)
Towers (Regionals ~1st) (State ~3rd)
Helicopter (Regionals -3rd gahhh) (State ~5th)
Wind Power (Regionals ~1st) (State ~3rd TIERED!)

Hooray for getting everything i wanted?

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ichaelm
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Re: Sumo Bots B/C [Trial]

Postby ichaelm » May 24th, 2010, 6:37 am

Man I hope this is a C event next year :D

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Re: Sumo Bots B/C [Trial]

Postby JBoyd-NY » May 24th, 2010, 9:29 pm

lllazar wrote:Could anyone explain to me the different electrical parts of a sumo bot? Im really new to this and i have a good design in mind but i just need someone to explain to me everything ill need.

I do know what transmitter/receiver i want to buy, its a vex one...i found one of Ebay for 90 buck, 40 cheaper than on the vex site, and 4 crystals for 50 bucks on the vex site...

Thanks.


Check out Amazon.com - they have the crystal upgrade kit available for $18.28

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Re: Sumo Bots B/C [Trial]

Postby Flavorflav » May 26th, 2010, 11:05 am

JBoyd-NY wrote:
lllazar wrote:Could anyone explain to me the different electrical parts of a sumo bot? Im really new to this and i have a good design in mind but i just need someone to explain to me everything ill need.

I do know what transmitter/receiver i want to buy, its a vex one...i found one of Ebay for 90 buck, 40 cheaper than on the vex site, and 4 crystals for 50 bucks on the vex site...

Thanks.


Check out Amazon.com - they have the crystal upgrade kit available for $18.28

If you're not in a hurry, try eBay. They used to be up all the time for $10.

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Re: Sumo Bots B/C [Trial]

Postby dresden729 » June 6th, 2010, 3:54 pm

I'm new to this event and was wondering where I could get a cheap receiver/transmitter that fits the stupid rules of having 3 channels. I don't want to get ripped off by a website like vex and was hoping i could get it for under 30 buckeroonies.

gh
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Re: Sumo Bots B/C [Trial]

Postby gh » June 6th, 2010, 4:19 pm

I doubt you can get any radio set for that little. I would definitely avoid Vex though; their pulse train encoding (among other parts, including mechanicals) is incompatible with any of the other manufacturers' encodings, so you're locked in to Vex products once you go down that route. Futaba, Hitec, and other big name brands are basically compatible with each other as long as you get the same sort of modulation (e.g. AM, FM, FSK, DSM, etc.) and frequency.

Lower-end manufacturers like GWS make compatible devices. I used my 6 channel GWS FM set (~$80 at the time; the 4 channel kit was ~$60) pretty happily until the transmitter was destroyed in an accident.

I'd recommend petitioning your team to invest in a better radio set with at least six channels, since you can and probably will use it for years to come in other robot events. My BattleBots friends tell me 2.4GHz DSM2 sets (with Spektrum receivers) are bulletproof to any sort of interference from WiFi or microwaves, and avoid having to swap channels using crystals.
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Re: Sumo Bots B/C [Trial]

Postby ichaelm » June 6th, 2010, 5:15 pm

Man, I wish we had funding for SO...

Usually, when we actually need to buy something, either we buy it ourselves, or get the coach to buy us the cheapest version that will still be effective for the event. We never really splurge on the really-awesome-and-convenient-and-expensive version though. They look so shiny though, compared to what I have now...

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Re: Sumo Bots B/C [Trial]

Postby new horizon » June 7th, 2010, 2:17 pm

We don't get funding either. It's something not many schools can do. But we should get funding, SO building events can get mad expensive. :shock:


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