I don’t know how to title this without snickering. But has anyone noticed their NBN balls getting much firmer and losing their squishiness? The compression is nowhere near their original plyability.
I don’t know if it is after repeated use through a variety of launchers, or just exposure to air and the chemical reaction continues inside the ball. But we have several balls that are no where near as compress-able as they were on day 1. They are in a room that is generally about 60 degrees Fahrenheit but have been overly loved by a whole slew of robots via flywheels, and punchers and intakes.
We marked the weight in grams on one or two sets of balls when we first opened them. We will weigh a few if we can still see the weight marking to see if it increases or decreased in mass. I have a feeling these were from a set we did not mark. We also have some balls that have not been put into use yet but are of the same age. We’ll dig those out too and report.
This comes back to previous games where the newness of the elements played havoc to some robot designs. Reminds me of Gateway where the slickness of the new elements played a factor when you went to worlds. You may end up with a robot that acts very differently with used elements versus new ones.
Anyone else have Nothing But Net balls not be as squishy after excessive and repeated use?
Some competitions have had some harder feeling ones, but I’m guessing that newer batches of balls from vex might be different because as we can all recall the first batch was very variable in mass, so I’m wondering if they were changed to account for this. We had some problems with feeding into our flywheel because we had a chain fed flywheel and the ball could not get past the top sprocket.
If you’re using the same balls, they should be getting squishier, meaning less hard. Sometimes the balls are extremely hard because they are brand new.
Anyone know if worlds is gonna supply us with new balls? What about states?
I’m quite certain Worlds would use brand new balls. For State competitions it is up to the folks running the event, but VEX has recommended to use new balls (not required though). I know in Minnesota the plan is to use brand new balls at State.
Ours have gotten a bit softer as well, which is very unfortunate as they started out really soft. We got them at the end of summer, and we designed our intake around the squishiness. When we went to a scrimmage all the balls were quite solid, so we had to rebuild our entire intake system.
It was to fit inside a small turret ring so it had to be built in a condensed manner. We used a double side chain lift system, and it was designed to be slightly smaller than 4" thus crushing the balls slightly to help with traction. This was fine with the soft balls, but the hard ones stalled the intake.
Here’s a photo so you can see what I mean: http://i.imgur.com/KSpZJqIl.jpg
Of course the intake was in the middle of a very dense robot, and was awful to access.
No I was stubborn with that, and we got it working that day. The photo was taken during disassembly, and we now have a new turret. Which will hopefully work the solid balls I know are going to be used in our next competition. The balls I am talking about are almost completely solid, unless they have become softer in the last few weeks. I have so far designed the robot to account for “rock spheres” as such.