pic: FRC488 -- Ball Shooter

[Madison]

loading photo ...

[Nitroxextreme]

Just to give you a heads up on the chain running that fast..it works

Our team is using the big cim motor and gearing it up ...the chain stays on the sprockets with ease and we have yet to have any major problems besides small wobble

[Heretic121]

what type of recoil time are you getting *time needing to wait between getting identical distance on shots...

[Madison]

Originally Posted by Heretic121

what type of recoil time are you getting *time needing to wait between getting identical distance on shots...

We have no idea, honestly. Our shooter was prototyped by another mentor and some students using the small CIM, not the large. We collected some data based on that to get a better idea of the load it was seeing and things like that -- and then I applied the data to my calculations for the final design.

I think we'll have good success with shooting while running the motor at just 9V average or so based on my calculations and design which'll give us a bit better recovery time than something with similar shooting performance at 12V. Time will tell, though. The final track around which the balls will travel hasn't yet been fabricated, so we haven't tested this final implementation.

Interestingly, our prototype shooter shot the second ball in a series farther than it did the first. The backing about which the balls rolled flexed as the first ball exited, causing the trajectory of the second ball to change. It is neat and, while not something we intend to replicate, would be an interesting technique to apply to counteract energy losses.

[Donut]

I don't know about chains, but we know belts work that first (we're using it for direct drive between big CIM motor and a 9" wheel).

I don't know how it will be for this, but through our testing we've discovered we can shoot balls at ~1/2 second intervals and get the same distance. This was with a shooter that didn't have the surface the ball is pushed against completely secured though, so it may be faster once it's completely put together.