Hardest Shooting Robots

[MrTechCenter]

Originally Posted by sdcantrell56

My response to this whole thread is... WHY?

Why not?

[IronicDeadBird]

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.

[GreyingJay]

Originally Posted by sdcantrell56

My response to this whole thread is... WHY?

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?

[Electronica1]

Originally Posted by GreyingJay

I'm guessing that a faster shot velocity would reduce the effects of drag

Pretty sure it would increase the effects of drag

[sdcantrell56]

Originally Posted by GreyingJay

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?

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

[ravenc83]

Originally Posted by Jared Russell

5817's "bench grinder" is absolutely the hardest shooter I have ever personally witnessed on an FRC robot...ever.

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".

[fox46]

My response to this whole thread is... WHY?

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.

[maxgmeyerson]

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...

[Doiteain]

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.

[AdamHeard]

This thread needs videos.

[Poseidon5817]

Originally Posted by AdamHeard

This thread needs videos.

Here you go!

[CJ_Elliott]

Originally Posted by Poseidon5817

I think we are in the running for hardest shot. We broke the chains in the goal in one of our matches.

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.

[Poseidon5817]

Originally Posted by CJ_Elliott

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.

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

[CJ_Elliott]

Originally Posted by Poseidon5817

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

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?

[Poseidon5817]

Originally Posted by CJ_Elliott

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?

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.