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-   -   Let's Talk About The Bridge: (http://www.chiefdelphi.com/forums/showthread.php?t=99415)

Mongai 07-01-2012 21:43

Re: Let's Talk About The Bridge:
 
Quote:

Originally Posted by davidthefat (Post 1098570)
My guess is, like most years, the majority of the robots will be around 120 lb and it would be relatively easy to balance one or two on the bridge.

Ah, but remember that robot weight isn't evenly distributed.

KrazyCarl92 07-01-2012 21:46

Re: Let's Talk About The Bridge:
 
What about this scenario:

Eliminations, you have two robots on your alliance bridge and one robot on the coopertition bridge (and thus prevent your opponent from scoring on the coopertition birdge):
You get 20 points for the 2 robots on the alliance bridge and 10 points for the robot on the coopertition bridge, meanwhile preventing your opponent from scoring 10 points because you prevent them from using the coopertition bridge.

Unless your opponent could get 3 robots on their bridge, this scenario would come out the same as if you got 3 robots on a bridge and they got one robot on the coopertition bridge in terms of point differential.

I think the bridge will prove to be pivotal because not only do I think the points are weighted more balanced than in past years (...minibots), but also because FIRST reserves the right to change the point values come Championships.

Ninja_Bait 07-01-2012 21:49

Re: Let's Talk About The Bridge:
 
The Coopertition bridge scores no match points.

G40:
Quote:

When the final score is assessed per [G37], a Balanced Alliance Bridge, per Section 2.2.5, earn points
(note that the coopertition bridge is excluded from this rule)

And G41:
Quote:

If a Robot from each Alliance is balanced on the Coopertition Bridge when the final score for a Qualification Match is assessed per Rule [G37], each Alliance earns 2 Coopertition Points.
(note that the coopertition bridge scores only coopertition points in this rule)

davidthefat 07-01-2012 21:59

Re: Let's Talk About The Bridge:
 
So in other words, go big or go home.

Marc S. 07-01-2012 23:21

Re: Let's Talk About The Bridge:
 
If you made a wide base robot you could have a larger intake and more easily fit 3 bots on a ramp.

Peyton Yeung 07-01-2012 23:27

Re: Let's Talk About The Bridge:
 
I think getting 3 bots on will work well if the last bot to get on has a bridge lowering device.

Djur 07-01-2012 23:46

Re: Let's Talk About The Bridge:
 
Quote:

Originally Posted by davidthefat (Post 1098689)
How much force is required to bring the ramp down?

It's ~10 lbs at an end of the bridge. (estimation)

Quote:

Originally Posted by KrazyCarl92 (Post 1098642)
What about placing an accelerometer on the robot that allows it to autonomously balance on the bridge? You could have it detect when you are unbalanced on the bridge then press a button that activates the auto-balance and drives to correct the imbalance. Just tell whomever you are balancing with that you have this auto-balancing feature and you have yourself 20 points or 10 points and a 2 point CP bonus as the case may be!

That's actually ridiculously easy; I coded that from scratch on the 1hr drive back from the kickoff.

Andrew Y. 07-01-2012 23:58

Re: Let's Talk About The Bridge:
 
just put your battery on a linear slider and rack and pinion...::safety::

jreuter 08-01-2012 08:56

Re: Let's Talk About The Bridge:
 
[G37] Final scores will be assessed 5 seconds after the Arena timer hits zero.

So, whatever you do to balance, make sure it stays in position after you lose power.

pfreivald 08-01-2012 09:58

Re: Let's Talk About The Bridge:
 
Quote:

Originally Posted by Marc S. (Post 1098896)
If you made a wide base robot you could have a larger intake and more easily fit 3 bots on a ramp.

An omnidrive robot can more easily fit, too.

Djur 08-01-2012 10:21

Re: Let's Talk About The Bridge:
 
Quote:

Originally Posted by pfreivald (Post 1099254)
An omnidrive robot can more easily fit, too.

Omniwheels wouldn't be too useful because they can slide very easily and don't have good traction; Mecanums are a bit more helpful because they don't slide as easily and have better traction; holonomic drive would be best because it doesn't sacrifice traction for mobility, but it's difficult to create. Just my 2 cents.

PayneTrain 08-01-2012 10:26

Re: Let's Talk About The Bridge:
 
I guess this thread would be good to talk about how teams plan on moving the bridge from the static position down to court level so the robot can get on the bridge.

Are you going to stick a wedge on top of your robot to push it down on the other side for an alliance member? Are you going to build something that knocks it down on your side? Are you going to put legs on the robot so it can jump, or something else?

pfreivald 08-01-2012 10:26

Re: Let's Talk About The Bridge:
 
Quote:

Originally Posted by Djur (Post 1099265)
Omniwheels wouldn't be too useful because they can slide very easily and don't have good traction; Mecanums are a bit more helpful because they don't slide as easily and have better traction; holonomic drive would be best because it doesn't sacrifice traction for mobility, but it's difficult to create. Just my 2 cents.

I meant omni-directional, not necessarily "omni wheels" -- so this would include mecanum, swerve, etc, etc.

Some kind of deployable traction device would be desirable if these are used, of course.

slijin 08-01-2012 12:32

Re: Let's Talk About The Bridge:
 
Quote:

Originally Posted by davidthefat (Post 1098689)
How much force is required to bring the ramp down?

The tipping point seems to be ~54 lbft of torque, as per the 5th Field Tour video.

davidthefat 08-01-2012 12:35

Re: Let's Talk About The Bridge:
 
Quote:

Originally Posted by slijin (Post 1099398)
The tipping point seems to be ~54 lbft of torque, as per the 5th Field Tour video.

So at 1.5 feet out from the center, around 36 lb is required to tip it. How much does a battery weigh?


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