Ball Texture

[RoboMaster]

Variation is what you have to live with in the FIRST games. That's the way real life works too. Design robots accordingly.

In 2009 the balls would break and we had to test to see if our mechanisms would accept a broken ball.

Last year wasn't so bad, but the tubes weren't always blown up to exact dimensions (either at competitions or at home). They would pop too.

If you've got a spinning-wheel shooter, see if you can compress the balls enough that the difference in squishiness doesn't matter (or if normal compression works like this anyways). I'm guessing that this will work. (But don't take my word for it.)

[evoluti1]

We've hypothesized that this difference in behavior is due to the air-tightness of the ball's outer surface. If you take a brand new ball and squish it all the way, the air rushes out and takes time to find the few holes in the ball's skin as it rushes back in. However, an old ball with cuts and tears in it appears to bounce back because the air can rush in faster.

If you're going to assume anything, assume they'll bounce back. Our guess is that they'll probably all be like that after the first match (definitely after Thursday at competitions). However, it's better not to assume anything. Different balls will have different surface features, even older balls may be slow to bounce back also as the foam wears out. It's best to build a ball-ejecting mechanism that doesn't care how fresh or messed up the balls are.

Hope that helps!

[Siri]

Originally Posted by TheAthlete

Since we havent really heard of any other complaints, we're going to assume the KOP basketballs are the competition regulation, if thats safe to say.

Don't. We got both types in the Kickoff KOP. It doesn't seem to be solely and wear and tear issue, though that certainly contributes. We have several balls that, while provided by the KOP and/or FIRSTChoice are very obviously manufactured differently to the point of different densities, surface finishes (sheens, hardnesses) and manufacturing hole methods.