Game piece inflation

[PurpleInk]

Due to the weather and the temperatures inside the Avanti Dome at the Central IL Regional, at the beginning of the day(40 degrees indoor temp), the game pieces were perfectly inflated but as the indoor temperature rose with robot interaction and increasing outdoor temperatures, the game pieces looked like they were going to burst. We had to drop our 3.5" roller for two 4" wheels spaced about twelve inches apart and we had to change our reduction on that collector to adjust the geometry of our shooter so we could continue to shoot.

The event staff adjusted the game pieces by Friday, however. Teams mentioned the issue to event staff and they did everything they could to improve it!

[JTEarley]

They were very much over inflated at Alamo on Thursday, and after many complaints, the balls were slightly deflated during lunch and they were fine throughout the event.

[Jim Wilks]

GTRW had a ball sizing ring. It was 25" in diameter and came with the field. I'm assuming other regionals had one as well. Was it being used?

[Racer26]

Originally Posted by Jim Wilks

GTRW had a ball sizing ring. I'm assuming other regionals had one as well. Was it being used?

If there was a ring to be used, why wasn't its size shared with teams weeks ago such that we could test robots accordingly? The inflation level of the balls completely changes how they fly from some shooter designs and changes the intakes too.

[Brandon_L]

Originally Posted by Jim Wilks

GTRW had a ball sizing ring. It was 25" in diameter and came with the field. I'm assuming other regionals had one as well. Was it being used?

Officially, the balls are inflated to the point where they look about right and thats it.

Although I agree there should be a sizing box 100%, this is the first I'm hearing of it being actually used.

+1 GTRW Crew

[Racer26]

Originally Posted by Brandon_L

Officially, the balls are inflated to the point where they look about right and thats it.

Although I agree there should be a sizing box 100%, this is the first I'm hearing of it being actually used.

+1 GTRW Crew

The problem though, is that many teams at GTRW had to rework their intakes and shooters as the balls at GTRW seemed to be overinflated by the official inflation method provided to teams at kickoff.

[notmattlythgoe]

Originally Posted by Brandon_L

Officially, the balls are inflated to the point where they look about right and thats it.

Although I agree there should be a sizing box 100%, this is the first I'm hearing of it being actually used.

+1 GTRW Crew

There was a sizing box used for Logomotion . Unfortunately it didn't help because people were still inflating the tubes until they were overflowing from the box and were bigger than most teams expected.

[Jim Wilks]

The sizing ring had a hole exactly 25" in diameter. When a few teams at GTRW complained about the ball sizes, they were checked and a few were found to be oversized. Those ones were deflated.

Some teams cam by and used the sizing ring on their practice balls as well.

The ring went in the robot inspectors case.

[Patrick Flynn]

Does anyone else think that a sizing box is not the way to go here? We have no idea the tolerances that these balls are designed at. If the balls are +/- .5in a sizing box would lead to over and under inflated balls, and then everyone would be complaining about that.

I think there is a bunch of confusion here.
Having all balls the same size in diameter would lead to different levels of inflation.
Having all balls inflated to the same PSI would lead to different sizes, in diameter.

Simply put the tolerances on there balls are not +/-.0000000001 There is no way to have all these balls be the same size and same pressure.

[notmattlythgoe]

Originally Posted by Patrick Flynn

Does anyone else think that a sizing box is not the way to go here? We have no idea the tolerances that these balls are designed at. If the balls are +/- .5in a sizing box would lead to over and under inflated balls, and then everyone would be complaining about that.

I think there is a bunch of confusion here.
Having all balls the same size in diameter would lead to different levels of inflation.
Having all balls inflated to the same PSI would lead to different sizes, in diameter.

Simply put the tolerances on there balls are not +/-.0000000001 There is no way to have all these balls be the same size and same pressure.

The rules state nothing about ball pressure, but they do state an approximate size. And assuming that all of the covers are approximately the same size the balls should be inflated to around the same size according to the inflation guide. So there is no argument backing pressures since the rules state nothing about it.

[jman4747]

We really should not have a problem putting a ball in a box and pumping it up till it touches the sides.

I don't see why you can't just pump them up in the morning and check them at lunch each day and be done. Or even just once a day (I'm assuming they may lose some air getting hit and squished all day).

The rules say approximately 2ft diameter. Excuse me for designing for 23"-25".

[Annatreptic]

They were extremely inflated at teh Glacier Peak PNW regional as well. So inflated in fact, that it started to continuously stall our motor and wouldn't allow us to gather the balls at all. We want to put some slop in our pneumatic mounts to our arm to try to fix this problem, any other teams done things to help this problem?

[MarcD79]

This thread can go on and on, but the one thing to remember is that according to the Filed manual, the balls should be inflated to the point where the zipper is not touching itself, nor stretched into a football shape. They are to be inflated where the zipper is slight pulled apart where the inflating plug can be inserted. The zipper should be able to be pulled closed with some slight resistance. I did not receive any complaints at the Groton District event. I checked all balls often & they were consistent. We did have 2 balls checked at the beginning of the Eliminations & found to be slightly over-inflated by a volunteer who was just trying to keep up & was pumping them up rapidly. After that they seemed to be consistent. They will be scrutinized at the Southington District Event to be properly inflated.

[tickspe15]

Originally Posted by Annatreptic

They were extremely inflated at teh Glacier Peak PNW regional as well. So inflated in fact, that it started to continuously stall our motor and wouldn't allow us to gather the balls at all. We want to put some slop in our pneumatic mounts to our arm to try to fix this problem, any other teams done things to help this problem?

we noticed that the balls were more inflated than we expected at auburn mountain view during week 1 and upon further testing found problems similar to the ones you describe. We then altered our intake by moving the roller up about an inch to decrease ball compression and avoided problems at glacier peak. Though the balls may be over inflated they have been consistent at PNW event

[Ether]

Has anybody out there actually measured the difference in pressure between a properly inflated ball and a slightly over-inflated (and under-inflated) one?

Is it a large enough difference that it could be reliably measured with a relatively inexpensive gauge at the events?