Re: Hardest Shooting Robots
 

Why not?

Re: Hardest Shooting Robots
 

My understanding is team 2240 has an interesting shooter to say the least. I haven't seen it in action, I don't know exact details, all I know is how the boulder goes through the process of "shooting" and it is scary. It is also worth noting I haven't seen anything like it before ever.

Re: Hardest Shooting Robots
 

I'm guessing that a faster shot velocity would reduce the effects of drag, deformed balls, and other real-world variables from affecting your trajectory calculations?

Re: Hardest Shooting Robots
 

Pretty sure it would increase the effects of drag

Re: Hardest Shooting Robots
 

I tend to think the opposite. Our testing agrees as well.

Re: Hardest Shooting Robots
 

Based of the video physics analysis we did, the shot clocks in at 110 FPS or 75 MPH. Based off the boulder I took to the face after it ricocheted off the wall of our shop, the shot clocks in at just under "Superman sneezing in your direction".

Re: Hardest Shooting Robots
 

Basically it's about trajectory. You want the flattest one so that when aiming, your shot is less dependent on the distance to target. This means the driver doesn't have to worry about positioning of the robot and the software doesn't have to calculate a firing solution as rigorously. Furthermore, the shot is less dependent on the condition of the game pieces. In 2013's case, a linear trajectory was desired because math is hard. Take a look at video of 2013 in aerial assist- the same design philosophies were in use. On the FIRST Robotics Canada facebook page, they recently posted a ton of pictures of GTR East with a few close-ups of 2013's machine. While I can't speak too much to the development of the mechanism as I am in a purely advisory relationship with the team this year, I do know it required a number of prototypes and testing to see what the limits of compression, friction material and inertia were.

Re: Hardest Shooting Robots
 

Our robot competed at FIM Event Sterlish-Standing (Week 1) and during our auton, we got caught up on on of the defenses, with our shooter tilted up, with even more angle tacked on as a result of the defense. We are using a flywheel system with two mini-CIM's to shoot the ball. Our autonomous shoots the ball after a certain period of time, so just before the auton period ended, the ball was shot and hit the ceiling, almost getting stuck in the rafters of the HUGE gym we were in. Pretty powerful shot. Not to mention that we may or may not have taken out one of the other drivers...

Re: Hardest Shooting Robots
 

For our shooter competition speed it about 45-55% power, ending up around 4k RPM.

However, we do have a 'testing' mode referred to as Airplane! for shooting balls 60 feet, scar- I mean impressing parents, and punishing underclassmen.

Re: Hardest Shooting Robots
 

This thread needs videos.

Re: Hardest Shooting Robots
 

Re: Hardest Shooting Robots
 

I gotta ask... what in the world are you using? I see mini cims and what looks like 6 or 8 inch wheels but like... We did testing with direct drive mini cims on 6 inch wheels and it wasn't that powerful.

Re: Hardest Shooting Robots
 

We're using mini CIMs geared up 2:1 with 6 inch wheels at 4-5 inches of compression.

Re: Hardest Shooting Robots
 

Were you aiming to kill innocent volunteers?
I like your shooter though. Btw, did the boulder from your reveal video ever come down or is it still in the ort cloud? :D

Re: Hardest Shooting Robots
 

We shot into the stands a couple of times during practice matches (from the corner, over the tower, and into the top of the bleachers). Regarding our boulder, it's supposed to pass Voyager tomorrow. :D