16-04-2012 17:12

Tom Bottiglieri

Re: pic: FRC973 Testing Bridge Stability

Where's the top part? I only ask in the name of science.

16-04-2012 17:13

steelerborn

Re: pic: FRC973 Testing Bridge Stability

I don't think the shooter mechanism is on, 973 seemed a lot taller at CVR.

16-04-2012 17:16

AdamHeard

Re: pic: FRC973 Testing Bridge Stability

It's on there, it's just not powdercoated.

16-04-2012 17:27

Nate Laverdure

Re: pic: FRC973 Testing Bridge Stability

Adding bumpers probably also made a non-negligible change in your CG position.

16-04-2012 17:31

AdamHeard

Re: pic: FRC973 Testing Bridge Stability

It would lower our CG though.

16-04-2012 17:34

Nate Laverdure

Re: pic: FRC973 Testing Bridge Stability

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).

16-04-2012 19:04

jblay

Re: pic: FRC973 Testing Bridge Stability

What kind of tread do you have on your wheels?

694th post

16-04-2012 20:45

rcmolloy

Re: pic: FRC973 Testing Bridge Stability

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

16-04-2012 20:49

Re: pic: FRC973 Testing Bridge Stability

Looks like Wedgetop tread from Andymark

16-04-2012 21:16

jblay

Re: pic: FRC973 Testing Bridge Stability

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.

16-04-2012 21:24

Re: pic: FRC973 Testing Bridge Stability

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.

16-04-2012 21:44

MichaelBick

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.

16-04-2012 23:11

AdamHeard

Re: pic: FRC973 Testing Bridge Stability

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.

16-04-2012 23:33

DampRobot

Re: pic: FRC973 Testing Bridge Stability

Cool, swerve! Does anyone know if there are higher resolution pictures of the modules on CD?

16-04-2012 23:35

AdamHeard

Re: pic: FRC973 Testing Bridge Stability

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.

18-04-2012 11:59

techtiger1

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.

18-04-2012 12:08

Jared Russell

Re: pic: FRC973 Testing Bridge Stability

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).

18-04-2012 14:59

BJC

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.

11-01-2013 23:56

NXTGeek

Re: pic: FRC973 Testing Bridge Stability

Any chance 973 will post their 2012 rebound rumble robot CAD for the world to see?