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kiettyyyy
02-17-2009, 01:08 PM
This year, we collaborated with Team 254 for the third.... oops I mean, fourth year in a row! We're using the same robot design, but, in a better color ;)

Here it is:

http://kiet.us/2009robot.jpg

JVN
02-17-2009, 01:28 PM
MUCH better color choices.

nahstobor
02-17-2009, 01:29 PM
From the video of 254 I thought it was only human load but I was mistaken.

Lil' Lavery
02-17-2009, 01:36 PM
How much did 968/254 stretch their polycord this year? I'm assuming it's not the 10% that you guys went with in 2006, but the 3% that 1712 opted for is a bit loose.

kiettyyyy
02-17-2009, 01:38 PM
How much did 968/254 stretch their polycord this year? I'm assuming it's not the 10% that you guys went with in 2006, but the 3% that 1712 opted for is a bit loose.

9%

Brandon Holley
02-17-2009, 01:40 PM
We went with 5%...its worked out well so far, we may change it for a bit more

excellent robot guys...GREAT work

Lil' Lavery
02-17-2009, 01:45 PM
We went with 5%...its worked out well so far, we may change it for a bit more

Our 3% is normally fine, but the cords sometimes jump out of their "slots" during operation. It's not that big of a deal, until we attempted to mount a "stopper" for our balls, which caused a little bit of pandemonium among the cords.

Luckily it would be possible for us to stretch them further rather easily (moving two plates and a few new holes), but it's not the type of operation I'd want to undertake unless it is really needed.

Sorry for the mini-hijack. It is quite an impressive bot, which quite an impressive color scheme.

Brandon Holley
02-17-2009, 01:48 PM
Our 3% is normally fine, but the cords sometimes jump out of their "slots" during operation. It's not that big of a deal, until we attempted to mount a "stopper" for our balls, which caused a little bit of pandemonium among the cords.

Luckily it would be possible for us to stretch them further rather easily (moving two plates and a few new holes), but it's not the type of operation I'd want to undertake unless it is really needed.

Sorry for the mini-hijack. It is quite an impressive bot, which quite an impressive color scheme.

I understand completely.

We just underwent a mini redesign of our roller system to counter the tension force we see from our polycord belting. The cords time to time, do jump out of their slots, thats why bumping up a % or 2 may help us out.

/hijack over

Herodotus
02-17-2009, 01:51 PM
You guys and 254 always have some of my favorite looking robots. I think it is the paint scheme that really seals the deal for me. A great design combined with a schweet paint job. As for who's color is better... well I'm a fan of red. ;)

InfernoX14
02-17-2009, 02:16 PM
968? Lies!

Look at the whee-

Right....

Ian Curtis
02-17-2009, 02:27 PM
Our 3% is normally fine, but the cords sometimes jump out of their "slots" during operation. It's not that big of a deal, until we attempted to mount a "stopper" for our balls, which caused a little bit of pandemonium among the cords.

Luckily it would be possible for us to stretch them further rather easily (moving two plates and a few new holes), but it's not the type of operation I'd want to undertake unless it is really needed.

Sorry for the mini-hijack. It is quite an impressive bot, which quite an impressive color scheme.

Zip ties with the "heads" at 180 degrees will help keep the bands from moving too much. If you've got the weight, little lexan fingers (you can see two sets near the bottom of the conveyor) (http://www.chiefdelphi.com/media/photos/32816) work really well at keeping them in order.

Anyways, back on 968 track. You and 254 have once again built two very, very pretty, very good robots. Do you expect any inspector troubles with your not-quite-West-Coast drive?

Is there something to protect your front collecting mechanism? It looks like another robots corner in your collector could do some nasty things.

sdcantrell56
02-17-2009, 02:27 PM
Your robots are always so beautifully engineered and this year is no exception. I absolutely love all of the design work that went into this and how (relatively) simple this design is. You have built yet another inspirational, absolutely killer bot. I always hate it when I say why didn't I think of that but it's good to teach people to maybe spend that little bit of extra time trying different ideas before committing to a plan. Anyways, congratulations on an incredible bot.

It looks like you're powering the main elevator with 2 cims, is that right? That would explain the absolute excess of power.

Molten
02-17-2009, 02:35 PM
How much does it weigh? Looks pretty solid and a bit heavy. Just wondering what you did to make up for this.

spc295
02-17-2009, 02:59 PM
much better color

RobJ
02-17-2009, 03:18 PM
This year, we collaborated with Team 254 for the third year in a row! We're using the same robot design, but, in a better color ;)



It is actually the 4th year in a row. Do I need to review with you how to count?

sanddrag
02-17-2009, 03:20 PM
I think it's amusing how it looks like a miniature vex-sized model sitting on the table in this photo. :D

We tested the urethane belting stretch extensively with a single-belt jig ofr each conveyor, before we got the robot built. 9% stretch seemed to be the magic number for us. However, by the time we put 10 of them on a roller, there's about 300 pounds of force pulling on it. Quite the stresses on the rollers, considering shear stress, torsional load, and bending moment. If we were to do it again, we might go with slightly less stretch.

Do you expect any inspector troubles with your not-quite-West-Coast drive?
We do not anticipate any inspector troubles with the robot. Everything complies with rules and GDC posts. The smaller frame member above the wheels is structural; we often use it to lift the robot.

We anticipate weighing in at approximately 8 pounds under the limit.

As an interesting note, I'd like to mention that we started the season with $11 (yes, eleven) to our team's name and no certain sponsors. Thanks to fundraising efforts and the generous contributions of our returning and new sponsors, we have arrived with what you see here.

I would also like to thank the members of team 254 for their countless hours of design, CAD, and manufacturing work that was put into this machine.

kiettyyyy
02-17-2009, 04:55 PM
It is actually the 4th year in a row. Do I need to review with you how to count?

Yeah, I need a lesson :(

One, two, three, three

I fixed the issue :P

Molten
02-17-2009, 10:12 PM
We do not anticipate any inspector troubles with the robot. Everything complies with rules and GDC posts. The smaller frame member above the wheels is structural; we often use it to lift the robot.


I won't be surprised if you do have trouble with it though. Sure the small member acrossed the top meets the wording of the rule. However, it doesn't meet the intent of the rule. I'm sure you will get to compete and everything fine. You might just have to lawyer with the judges a bit first. Honestly though, its hard to say without seeing it with the bumper on and getting a closer look. I'm just saying that refs sometimes read the rules differently then we do. Plan to have a bumper rules expert standing by for inspection. If the person that takes it for inspection doesn't seem confident and knowledgeable about every rule, they seem to assume that you don't know any of the rules.

AdamHeard
02-17-2009, 10:19 PM
I won't be surprised if you do have trouble with it though. Sure the small member acrossed the top meets the wording of the rule. However, it doesn't meet the intent of the rule. I'm sure you will get to compete and everything fine. You might just have to lawyer with the judges a bit first. Honestly though, its hard to say without seeing it with the bumper on and getting a closer look. I'm just saying that refs sometimes read the rules differently then we do. Plan to have a bumper rules expert standing by for inspection. If the person that takes it for inspection doesn't seem confident and knowledgeable about every rule, they seem to assume that you don't know any of the rules.

It meets the intent of the rule.

We independently ended up with what is functionally the same bumper frame support, and after seeing it welded in and built, I know it's plenty strong.

Either way, this is 968 you're talking about; They know what they are doing in terms of engineering and FIRST. A side bumper will never fail all season with those supports.

Molten
02-17-2009, 10:26 PM
This is one thing I will happily proven wrong over. But, I still see problems. I don't see it shattering or nothing, but I can foresee some cracking of the plywood. Good luck to anyone that is willing to risk it all on such a borderline legal robot. I for one, want 1.5" square tubing all around the base. Nobody is going to worry about that breaking.

thefro526
02-17-2009, 10:26 PM
The 968/254 Robot this year has to be one of the best looking robots ever built in first. It's simple yet elegant, while still maintaining that beastly look that RAWC/Cheesy Poofs are known for. Absolutely amazing.

On another note, I just read on the 968 website today about how they had lost many of their sponsors over the season. I was amazing when I saw that you were still able to pull of making such an amazing robot. This goes to show many of the (We'll say less funded) teams out there that with determination and a bit of luck you can do great things.

Once again, that bot is sick.

AdamHeard
02-17-2009, 10:29 PM
This is one thing I will happily proven wrong over. But, I still see problems. I don't see it shattering or nothing, but I can foresee some cracking of the plywood. Good luck to anyone that is willing to risk it all on such a borderline legal robot. I for one, want 1.5" square tubing all around the base. Nobody is going to worry about that breaking.

The intent of the rule is so that neither the bumpers nor frame break under impact.

Neither the bumper nor frame will break under impacts.

Intent met.

I apologize for my tone, but when you say borderline legal, you strike a nerve.

Molten
02-17-2009, 10:39 PM
Adam, I'm not trying to be rude. However, it seems apparent that we read different intent in the rules. When I read them, it seemed to imply that the entire back of the bumper must be supported(no spaces). On that robot, I see spaces. That is all I mean. Sure, the thing at the top runs along the top part of the bumper, and this does meet the technical wording of the rules. However, it doesn't meet the intent that I got from the rules(stated above).

With that said, let's let the judges decide what happens. Until then, let's use this thread to compliment the awesome design.

Cory
02-18-2009, 11:15 PM
This is one thing I will happily proven wrong over. But, I still see problems. I don't see it shattering or nothing, but I can foresee some cracking of the plywood. Good luck to anyone that is willing to risk it all on such a borderline legal robot. I for one, want 1.5" square tubing all around the base. Nobody is going to worry about that breaking.

I will beat on our tubing with a rubber mallet with complete confidence. It is structural, without a doubt.

Dave's calculations aside, I am 120% confident that there is no way our bumpers from last year or this year would break even if only supported every 12". We are using very high density, high quality plywood. It is extremely strong. I would have total confidence that if this year's robot was sitting at a stop and last year's bot t-boned it at 18.5 ft/s (with no bumpers on the front of last year's bot, mind you), this year's bumpers would be no worse for wear.

What is it going to take for teams to meet the bumper rules? a printout of a FEA of the robot? It's getting a little ridiculous when there's this much questioning of what is "structural" or not. If a team says a bar welded to their robot is structural, then that ought to be enough. If you can't make bumpers that don't break, well tough luck.

You can't legislate stupid. Teams will always shoot themselves in the foot even with all these restrictive rules designed to protect them.

$0.02

Tom Bottiglieri
02-19-2009, 12:09 AM
I will beat on our tubing with a rubber mallet with complete confidence.
Please do. Any chance of the Poofs missing a match against us is chance enough for me.

kiettyyyy
02-19-2009, 02:29 AM
</endbumperhijack>

andrew348
02-19-2009, 09:20 AM
Love the use of the 06 pickup and hopper from you guys. Worked great then, hope it works well again.

Galum
02-20-2009, 11:05 AM
Hehe we were studiing your Aim-High robot at the begining of the year; just like then, an amazing robot :)