Chief Delphi - Team 1678's Autocentering Roller

Chief Delphi (http://www.chiefdelphi.com/forums/index.php)

- Robot Showcase (http://www.chiefdelphi.com/forums/forumdisplay.php?f=58)

- - Team 1678's Autocentering Roller (http://www.chiefdelphi.com/forums/showthread.php?t=82631)

Re: Team 1678's Autocentering Roller

Quote:

Originally Posted by Ziaholic (Post 920367)

Very nice! We're playing around with something similar ... still working on selecting the perfect material and/or spinner diameter.

One thing I did notice from the video is that the apparent point of contact is almost halfway up the ball. To me, it looked like it could've been more than 3" into the frame perimeter of the 'bot.

Make sure you take <G46> into account ...

It appears to be almost halfway up the ball because we maximized our contact point. By using a small shaft and small pully, with bearings and brackets that are minimized (litterally some of the aluminum retaining the bearings are as think as the flange on the bearing :p) we ensure a high contact point on the ball. Our bar in the back of the roller cavity is at exactly 3" from our frame perimeter, so no possibility of having a ball come in any further than that. We make it a rule that the whole team reads the manual, not just the mentors on CD ;)

As far as possessing more than one ball is concerned, I don't see there being so many balls on the field that this will be an issue, and a mechanism capable of doing so isn't illegal in and of itself. Additionally, since the ball auto centers, it will be difficult for a second ball to fit in on either side.

I think I see where gorrilla is coming from. If the ball is 3" into your frame perimeter, and the bumper zone is 3 1/4-3 1/2" for each robot, thats makes for a distance of 1/2-1" between the outer edge of the ball and your opponents frame perimeter. Of course, this assumes bumpers don't squish, which is a poor assumption to make :rolleyes:

Re: Team 1678's Autocentering Roller

what is the spacing for your wedgetop

Re: Team 1678's Autocentering Roller

Quote:

Originally Posted by EricLeifermann (Post 920389)

How do you figure the rules prohibit robots from stealing balls from other robots?

Because the rules say the ball can be held up to 3" inside your frame perimeter, and your bumpers will extend 3.25" beyond your frame perimeter. That means the soccer ball is 6.25" inside your robot.

That leaves only 2.75" inches of the ball sticking out beyond your frame.

An opponent robot trying to "steal" the ball also has bumpers 3.25" thick.

Even if the "stealing" robot drives right up against you, bumper to bumper, any mechanism they use to steal must then extend past the frame perimeter, but cannot extend past their bumper.

That means the stealing mechanism must also be able to retract within two seconds.

That also means that they only have 2.75" of the ball the interact with to try and steal.

It's not that it is impossible, but it is pretty difficult justify, especially over just concentrating on being able to kick well.

Re: Team 1678's Autocentering Roller

Please give us a stationary picture of the roller.
Bruce