Team 968's 2009 Robot

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 :wink:

Here it is:

MUCH better color choices.

From the video of 254 I thought it was only human load but I was mistaken.

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.


We went with 5%…its worked out well so far, we may change it for a bit more

excellent robot guys…GREAT work

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

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. :wink:

968? Lies!

Look at the whee-


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) 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.

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.

How much does it weigh? Looks pretty solid and a bit heavy. Just wondering what you did to make up for this.

much better color

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

I think it’s amusing how it looks like a miniature vex-sized model sitting on the table in this photo. :smiley:

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.

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.

Yeah, I need a lesson :frowning:

One, two, three, three

I fixed the issue :stuck_out_tongue:

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.

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.