pic: #NotSwerve

Originally Posted by llamadon

Thanks Arpan! I will definitely post the results of our testing for you to veiw

I will remember the locktite! As for the speed I was actually having an mental debate with myself, and that is: Why gear for a high speed like say 22 fps? How often will you actually attain that speed? Being able to accelerate quickly is much more beneficial (in my mind) then being able to reach a high speed after spending a notable amount of time accelerating. Just a thought, and one of the reasons for the testing

Teams that gear for that speed use it in cases where you would want to cross the entire field extremely quickly in one straight shot (think 2011 or 2013). That being said, it's still something interesting to test. Most robots that run these speeds are on the lighter side (90-100 lbs), which helps them abuse the higher speeds with greater acceleration.

[Travis Hoffman]

These were sufficiently evil enough for our purposes in 2014.

4" Colsons on corners, 4" blue nitrile performance in the middle, 2.92 spread, max robot weight, roughly 5 fps / 15 fps split

And yes, Loctite everything per instructions.

[Arpan]

Originally Posted by Andrew Lawrence

Teams that gear for that speed use it in cases where you would want to cross the entire field extremely quickly in one straight shot (think 2011 or 2013). That being said, it's still something interesting to test. Most robots that run these speeds are on the lighter side (90-100 lbs), which helps them abuse the higher speeds with greater acceleration.

They do. However, in my experience, the risk of blowing the main breaker here is not worth it. It also necessitates a drive system such as split arcade for decent control.

We're considering going to ~16 calculated high and ~7-9 calculated low next year to avoid blowing the breaker.

[asid61]

Originally Posted by Arpan

They do. However, in my experience, the risk of blowing the main breaker here is not worth it. It also necessitates a drive system such as split arcade for decent control.

We're considering going to ~16 calculated high and ~7-9 calculated low next year to avoid blowing the breaker.

Main breaker blows can be easily avoided by implementing a "crash detection" current-sense code. Use a current sensor to check if it is a spike. If the current spikes for too long, you shift to low gear or put the CIMs in brake mode.
If you are using a shifter, I think going 18-20 fps is not all bad, as long as your driver can control it.