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-   -   pic: FRC973 Testing Bridge Stability (http://www.chiefdelphi.com/forums/showthread.php?t=105705)

AdamHeard 16-04-2012 17:11

pic: FRC973 Testing Bridge Stability
 

Tom Bottiglieri 16-04-2012 17:12

Re: pic: FRC973 Testing Bridge Stability
 
Where's the top part? I only ask in the name of science. :cool:

steelerborn 16-04-2012 17:13

Re: pic: FRC973 Testing Bridge Stability
 
I don't think the shooter mechanism is on, 973 seemed a lot taller at CVR.

AdamHeard 16-04-2012 17:16

Re: pic: FRC973 Testing Bridge Stability
 
It's on there, it's just not powdercoated.

Nate Laverdure 16-04-2012 17:27

Re: pic: FRC973 Testing Bridge Stability
 
Adding bumpers probably also made a non-negligible change in your CG position.

AdamHeard 16-04-2012 17:31

Re: pic: FRC973 Testing Bridge Stability
 
Quote:

Originally Posted by Nate Laverdure (Post 1158721)
Adding bumpers probably also made a non-negligible change in your CG position.

It would lower our CG though.

Nate Laverdure 16-04-2012 17:34

Re: pic: FRC973 Testing Bridge Stability
 
Quote:

Originally Posted by AdamHeard (Post 1158723)
It would lower our CG though.

Right, just saying. It might even offset the contribution caused by "the top part" (which you just said was on there, but doesn't quite match the other picture).

jblay 16-04-2012 19:04

Re: pic: FRC973 Testing Bridge Stability
 
What kind of tread do you have on your wheels?

694th post

rcmolloy 16-04-2012 20:45

Re: pic: FRC973 Testing Bridge Stability
 
Quote:

Originally Posted by jblay (Post 1158771)
What kind of tread do you have on your wheels?

694th post

Wedgetop tread. Not sure the actual source. Adam can back that up though.

Andrew Lawrence 16-04-2012 20:49

Re: pic: FRC973 Testing Bridge Stability
 
Quote:

Originally Posted by jblay (Post 1158771)
What kind of tread do you have on your wheels?

694th post

Looks like Wedgetop tread from Andymark

jblay 16-04-2012 21:16

Re: pic: FRC973 Testing Bridge Stability
 
Quote:

Originally Posted by SuperNerd256 (Post 1158827)

That's what I figured it was but I just don't understand how that is possible without tread that deploys epoxy between itself and the bridge.

Andrew Lawrence 16-04-2012 21:24

Re: pic: FRC973 Testing Bridge Stability
 
Quote:

Originally Posted by jblay (Post 1158847)
That's what I figured it was but I just don't understand how that is possible without tread that deploys epoxy between itself and the bridge.

From what I hear, wedgetop tread has more traction on surfaces like hdpe than roughtop or blue nitrile tread. That's the main reason most top teams used it.

Also, I'm not sure if the robot has an active breaking system on it or not. That could help. 256 had software breaks that worked so well we could be at a 45 degree angle and still stay where we were without falling. Of course, these disabled when the robot was turned off.

MichaelBick 16-04-2012 21:44

Re: pic: FRC973 Testing Bridge Stability
 
also, with swerve you can turn your wheels parallel to the axis of rotation of the bridge, so that your wheels don't turn at all.

AdamHeard 16-04-2012 23:11

Re: pic: FRC973 Testing Bridge Stability
 
Quote:

Originally Posted by MICHAELABICK (Post 1158863)
also, with swerve you can turn your wheels parallel to the axis of rotation of the bridge, so that your wheels don't turn at all.

Yup.

It's also AndyMark supplied wedgetop.

the robot is missing the bridge mech in this pic, but that's only ~3 lbs and doesn't apreciably affect CG. The shooter as it exists on comp bot is on this in all it's heaviness.

DampRobot 16-04-2012 23:33

Re: pic: FRC973 Testing Bridge Stability
 
Cool, swerve! Does anyone know if there are higher resolution pictures of the modules on CD?

AdamHeard 16-04-2012 23:35

Re: pic: FRC973 Testing Bridge Stability
 
Quote:

Originally Posted by DampRobot (Post 1158939)
Cool, swerve! Does anyone know if there are higher resolution pictures of the modules on CD?

The modules are pretty similar to what is posted in the CAD in my sig.

The wheel modules are 99% the same, the corner modules are 80% the same.

techtiger1 18-04-2012 11:59

Re: pic: FRC973 Testing Bridge Stability
 
Adam I have been meaning to ask, who came up with your front intake system? The side to side capability is a ingenious idea. I was wondering if it was a after though that was added on later or in the original design.

Jared Russell 18-04-2012 12:08

Re: pic: FRC973 Testing Bridge Stability
 
Quote:

Originally Posted by techtiger1 (Post 1159501)
Adam I have been meaning to ask, who came up with your front intake system? The side to side capability is a ingenious idea. I was wondering if it was a after though that was added on later or in the original design.

The first incarnation of that mechanism in FRC that I know of was Chief Delphi VII in 2002.

http://www.chiefdelphi.com/media/photos/22478

It has been very effective this year, utilized by 973, 177, 1477, 2415, and others at various points this season. It was also featured on a couple of 2006 robots, most notably team 27's (they also used the same concept in 2008).

BJC 18-04-2012 14:59

Re: pic: FRC973 Testing Bridge Stability
 
We also use this system on our robot. We call it the "Joe Johnson." It funnels balls down to a single column awesomely well.

NXTGeek 11-01-2013 23:56

Re: pic: FRC973 Testing Bridge Stability
 
Any chance 973 will post their 2012 rebound rumble robot CAD for the world to see?


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