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View Poll Results: What kind of chassis are you building?
Wide Chassis (longer side in front) 139 44.27%
Narrow Chassis (smaller side in front) 175 55.73%
Voters: 314. You may not vote on this poll

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Unread 12-01-2012, 22:41
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Re: Poll: Wide or Narrow Chassis?

Quote:
Originally Posted by Ninja_Bait View Post
We, the long chassis voters, are now the minority that can, in the end, tell the majority "I told you so". (At least, I hope so. )
I agree haha. Grabbing a ball in 11" (I believe thats what we calculated would be the space allotted for bringing in balls according to bumpers being 8" from either end or w.e) space on the narrow end just won't be enough. Using the wide side, you won't have to worry about that. You'll have plenty of space to grab a ball and bring it inside the bot without thinking about it in the heat of the game.
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Unread 12-01-2012, 22:47
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Re: Poll: Wide or Narrow Chassis?

Quote:
Originally Posted by Henzado View Post
We have decided to go with narrow body. We, as a team have decided that is very important to go over the barrier. A wider robot has a higher center of gravity, as compared to a narrow one.

The main point is a wider base means a likely chance of your robot taking a dive.
Wider does not equal higher CG.

Wider probably does equal larger angle of attack and thus more movement of the CG as it climbs the barrier.

And thats the tradeoff.
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Unread 12-01-2012, 23:08
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Re: Poll: Wide or Narrow Chassis?

Quote:
Originally Posted by Daniel_LaFleur View Post

Wider probably does equal larger angle of attack and thus more movement of the CG as it climbs the barrier.
This is Essentially what I meant, just simply better put. Thanks for making it clearer.
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Unread 13-01-2012, 00:14
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Re: Poll: Wide or Narrow Chassis?

Quote:
Originally Posted by Siri View Post
Low CG is definitely always something for which to aim. (Unless the GDC ever forgets to specify the height dimension as being perpendicular to the floor.) However, I can't claim it's necessarily easy to achieve. It definitely can be if you have a non-existent scoring mechanism, an exceedingly light/low shooter, or Andy Baker. Us tall shooters will being paying very, very close attention to it.
The height, length and width are relative. I learned that during our rookie season in 2008. Bomb Squad showed up with a robot that started the match in one orientation but drove around in another. I quickly learned that day what it means to think outside the box. I still think this is the most genious robot I have seen in person.

http://www.youtube.com/watch?v=bI_2UMEUbNw"]http://www.youtube.com/watch?v=bI_2UMEUbNw
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Unread 13-01-2012, 19:20
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Re: Poll: Wide or Narrow Chassis?

Quote:
Originally Posted by CrashTestPilot View Post
The height, length and width are relative. I learned that during our rookie season in 2008. Bomb Squad showed up with a robot that started the match in one orientation but drove around in another. I quickly learned that day what it means to think outside the box. I still think this is the most genious robot I have seen in person.

Link
This was an awesome bot. But is it always legal? In 2008 there was no height limit and only a 80" diameter upright cylinder length/width limit. The bumper zone was also only defined in Playing Configuration. This year the bumper zone is "<R29> Bumpers must be located entirely within the Bumper Zone when the Robot is standing normally on a flat floor", though "normally" could take the "perpendicular" or "standard" definition.
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Unread 16-01-2012, 01:50
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Re: Poll: Wide or Narrow Chassis?

Quote:
Originally Posted by DonRotolo View Post
Impossible is such a strong word.

I have 3 robots, all 6-wheel low center drive at 119 pounds:
Bot 1: Heavier in front by 10 pounds, 21" from center wheel to edge of heavy end bumper
Bot 2: Perfectly balanced, 44" long
Bot 3: Heavier in rear by 10 pounds, 21" from center wheel to edge of heavy end bumper.

The bots are lined up on the 88" ramp Bot 1 (heavy end in), Bot 2 (in the middle), Bot 3 (also heavy end in). Bot 1 takes up 21.5", the center wheel is 0.5" from the edge of the ramp. Bot 2 takes up 44 inches. Bot 3 is like Bot 1.

21.5 + 44 + 21.5 = 87 inches. They fit.

Oh, and Bot 2 turned sideways on the ramp before Bots 1 and 3 positioned themselves, now you could fit Andy Baker on there too.

Oh, and all three bots are really 37 inches long, not 38, so there's extra room.

Still Impossible?
On this train of thought: we are planning on 8in pneumatics for traction and barrier travel. If we decide to go to to wide orientation, we could not (comfortably) fit all 6 wheels in the drivetrain. We would therefore take up more space on the bridge in wide orientation because we would have to have both front and back wheels on the bridge to balance. I suppose we could switch wheels size, but I also tipping.

The most dangerous thing i see with wide orientation is the moment you drive up the bridge at it tips from one slant to the other as you cross. I worried the tipping of the bridge will give momentum to the robot to start to tip forward.
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Unread 16-01-2012, 09:44
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Re: Poll: Wide or Narrow Chassis?

I feel like that problem comes down to weight distribution and current momentum of the robot. If you are moving the robot at a negligible velocity, I feel like tipping wont be that bad.

We're probably going to play with one of our old wide bots on the bridge today and try to tip it.
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Unread 16-01-2012, 10:07
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Re: Poll: Wide or Narrow Chassis?

Quote:
Originally Posted by soxfan269 View Post
*snip*
As far as the bump goes, I don't see any major advantage that going over the bump would give you. I can't see a robot crossing the mid field more than twice, and probably more often only once. The only reason to go onto your opponents side would be to guard or to pass balls. If you're doing that then you're probably going to stay at that end most of the game. The only reason you might cross again would be for end game.
*snip*
Have you 'played' the game yet? On the first day, we simulated the game with people being pushed around on dollies, acting like robots. What we found is that if one alliance was able to distribute balls form their defensive end to their offensive end, there would be a serious deficit in the defensive end. In finals, I don't see this as being a large issue because all 6 robots should be evenly matched.

However, in qualification matches, there are times that alliances will NOT be even. Then, you may need to repeatedly traverse back and forth across the bumper to get the balls that you are looking for. If your teammates are useless too, that only adds to what must be done.

I wouldn't underestimate bump travel.

Cheers!
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Unread 16-01-2012, 10:14
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Re: Poll: Wide or Narrow Chassis?

Alex.Q the 8" wheels from AM are only (by our measurement) 7.6 in. in diameter and fit 6 nicely in the wide config.

Tipping a wide bot??? Ya if you have a high CG it will probably get more tippy if that is what you mean. Make everything up top LIGHT and everything down low HEAVY. Make your bumpers the full 20 lbs and make them heavy at the BOTTOM and this should help the tippy issue.

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Unread 17-01-2012, 21:42
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Re: Poll: Wide or Narrow Chassis?

Quote:
Originally Posted by viperred396 View Post
We are going wide

we are somewhat worried about tipping when attempting the bum so we are trying to create some kind of Wheely Bar so we dont tip
ignore previous response -

[G21]
Robots may extend one appendage up to 14 in. beyond a single edge of their frame perimeter at any time.
Violation: Foul for exceeding size allotments; Technical-Foul for continuous or repeated violations.

"These appendages are intended for use in manipulating Basketballs and/or Bridges. A Robot may have multiple extension devices onboard, but only one may be deployed at a given time."
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Last edited by Chris Fultz : 20-01-2012 at 22:15. Reason: Q+A proved me wrong
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Unread 17-01-2012, 21:44
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Re: Poll: Wide or Narrow Chassis?

Can I change my answer? We now decided on going wide-ways.
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Unread 20-01-2012, 16:24
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Re: Poll: Wide or Narrow Chassis?

Quote:
Originally Posted by Chris Fultz View Post
I think that violates this rule -

[G21]
Robots may extend one appendage up to 14 in. beyond a single edge of their frame perimeter at any time.
Violation: Foul for exceeding size allotments; Technical-Foul for continuous or repeated violations.

"These appendages are intended for use in manipulating Basketballs and/or Bridges. A Robot may have multiple extension devices onboard, but only one may be deployed at a given time."
The Q & A says different:

Game - The Game » Robot Actions » G21
Q. Can appendages (one at a time) be used for purposes other than manipulating Basketballs and/or Bridges? FRC3005 2012-01-11
Follow
A. Yes, as long as no other rules are violated.
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Unread 20-01-2012, 19:19
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Re: Poll: Wide or Narrow Chassis?

Our robot is going to be almost square, 27X30. We have our middle wheels lowered so we have a turning radius of zero.
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Unread 21-01-2012, 16:56
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Re: Poll: Wide or Narrow Chassis?

If you use mechanem or other multi-directional drive systems you can always have your intake on the side while your main drive is still forward.
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