Hardest Shooting Robots
 

So while watching the GTR-E Regional I was blown away by 2013's shooter speed. If you were hit by it I'm pretty sure you'd die.

I can't speak to what they are using to power their shooter, but 4607 is running 775pro's at a 3:1 with 4 inch high grip wheels. It isn't on 2013's level, but it has some good speed. The GreenHorn's Ri3D robot, Rivvet ran mini cims at 1:1 with 4" high grip wheels which was less powerful than 4607's shooter.

So I'm curious, who has the hardest shooter that you've seen, and what are the specs?

Re: Hardest Shooting Robots
 

I really don't know much about the specifics of the shooter, but my old team made powerful shots from the outer-works. Here is a video of them in their last match of the event.

https://www.youtube.com/watch?v=iP5g5bj30hw

Re: Hardest Shooting Robots
 

Sorry to derail a bit, but what compression are you using with that setup?

Re: Hardest Shooting Robots
 

3 inches

Re: Hardest Shooting Robots
 

We are running 2 miniCIMs with custom 'wheels'. The design, seating and balancing of the wheels is what gives us the power in the shot. Ratio is 1:1.

Re: Hardest Shooting Robots
 

Do you have any videos of it shooting?

Re: Hardest Shooting Robots
 

Can go in detail about the design and manufacturing process? Sounds like you are doing something very different from most teams.

Re: Hardest Shooting Robots
 

When our roborio isnt broken (hardware) we shoot really hard. Minicim running with about a 5 pound flywheel.

I can tell you that 4557 is using 775's 3:1 versa planetary with 4" high grips from last years kit bot 3" compression and we achieved 56 mph out of the shooter

Re: Hardest Shooting Robots
 

4009 DNA was shooting boulders pretty hard at Lake superior.. (they are on red alliance)

Re: Hardest Shooting Robots
 

Did anyone see 5817's reveal?

Re: Hardest Shooting Robots
 

What about non-wheeled shooters like punchers? My team, 1706, is using the kind of spring from a car suspension, taking about 245lbs of force to pull it back completely.

Re: Hardest Shooting Robots
 

Holy cow..

Re: Hardest Shooting Robots
 

What are you using to pull that back, and how long does it take?

Re: Hardest Shooting Robots
 

Ours is a puncher as well #teamclaw, but it "only" takes about 180-200 :p

Re: Hardest Shooting Robots
 

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

Re: Hardest Shooting Robots
 

Our flywheels are capable of shooting over the High Goals from the outer works if we're at 100%....
I wonder if it can go through the curtain separating the Pits and the Field.....

Re: Hardest Shooting Robots
 

Wa have made a half court shot easily on a basketball court. Ours can shoot the full length of the field. It's the fastes I have seen in pnw. But I don't think it is quite as fast as some of the ones mentioned above. But then again we also don't shoot it at full power during a match.

Re: Hardest Shooting Robots
 

It's interesting to see how FIRST has changed in their approach to this over the years. 10 Years ago some of the scary fast shooters we see would not be legal.

Re: Hardest Shooting Robots
 

I have to say 5817 Uni-Rex has an absolute laser HG/LG shot from anywhere..their only flaw was they tended to break down other than that it was awesome to behold.

They shoot so hard you can here the chains scream in mercy..very accurate when on...scary good rookie team withe swerve. Congrats on earning way into WC.

Pretty sure some of the best bots in the world were in CV (world high score set there) ... 5817 is right up there when not broken.

Re: Hardest Shooting Robots
 

You know they are just called boulders they aren't actual boulders right?

Re: Hardest Shooting Robots
 

We are using 2 vex 775s on a dual to one, with what I believe is a 15:1 versaplanetary. It will take about 4-7 seconds after firing to get it fully compressed

Re: Hardest Shooting Robots
 

I think we forgot that when we were designing :yikes:

Re: Hardest Shooting Robots
 

We too have a very powerful shooter. In testing at the build site it sounded like a jet engine and could be heard from the very back of the stands at Orlando. Our robot was called the "buzz saw" by the game announcer.

We didn't get to use it much due to copious mechanical problems, but when it did work those balls flew into that high goal at supersonic speed.

Re: Hardest Shooting Robots
 

Based on watching about 130 matches in person, I'm not entirely convinced that harder is better when shooting at the high goal.

Re: Hardest Shooting Robots
 

Well at least you have too much instead of too little, if you had too little power you would need to add MORE...

Re: Hardest Shooting Robots
 

They were pretty crazy. Probably a 75-100 ft shot outside of the field when they missed.

Re: Hardest Shooting Robots
 

Team 3453 is using 775pro's with 2 inch stealth wheels.

Re: Hardest Shooting Robots
 

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

Re: Hardest Shooting Robots
 

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

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

Re: Hardest Shooting Robots
 

Aha. That's what I was trying to get at with my (counter) intuition about dealing with factors affecting ball trajectory.

Re: Hardest Shooting Robots
 

We all see videos of shooters working, but at the NYC regional, I saw a lot of missed shots. thebluealliance.com has some great stats, but nothing on shooting percentages. Anybody have any real data on percentage of made shots in high goal?

Re: Hardest Shooting Robots
 

Just a prototype that didn't end up getting used, but here you go: https://drive.google.com/file/d/0Bzx...ew?usp=sharing

Re: Hardest Shooting Robots
 

The reactions in this video are fantastic.

Re: Hardest Shooting Robots
 

Our robot shoots pretty fast.
It's 4 775pro's with a roughly 2.5:1 reduction and 4" stealth wheels with the second set running faster than the first with a surface speed of 130fps. I believe we currently have just over 1.75" of compression. We decided to shoot the ball as fast as possible with as little compression as possible to minimize the effect of ball inconsistencies. In testing there has been little to no noticeable difference between new and heavily abused balls as long as there are no large chunks taken out

http://imgur.com/a/oG3xE

At competition we were running the shooter at 60%
Match Videos:https://www.youtube.com/playlist?lis...XQSRbiXWyekewe

Re: Hardest Shooting Robots
 

Unsure as to how powerful they were, but both 4488 and 3663 had issues with boulders rebounding out of the tower after their shots at their first events.

if you really want the kings of ridiculously hard shots, gotta go back to 2013 :P the robot I remember best from that is 3711; this video shows it relatively well at the 40 second mark, but you kinda had to be there. when they shot, you felt it; http://www.thebluealliance.com/match/2013wase2_sf2m1

Re: Hardest Shooting Robots
 

Re: Hardest Shooting Robots
 

Gratuitous slo mo FTW.

Re: Hardest Shooting Robots
 

Although not a robot from this year the most powerful shot I have ever seen was 159's robot from 2014. It was a catapult and the power it had was incredible overkill. The catapult was powered by four 500lb springs. 2000lbs of force! 2000! :eek: It had so much power that one time it was triggered without a ball in the 'pult and the bot launched up into the air and nearly did a complete front flip. The best part about it is it scared the safety inspectors to death, so in order to pass inspection the inspector told us if a team member stuck their hand in the springs when they were extended and held their hand there for 5 seconds we would pass inspection. So a guy from our team volunteered and promptly put his hand in the spring. A spring that, if its mounts failed would slam closed and crush his fingers into oblivion. This robot still scares 159ers to this day, its power was legitimately terrifying.

Re: Hardest Shooting Robots
 

So a volunteer forced a student to put themselves in a risky, unsafe situtation in order to demonstrate that the robot was safe? :eek:

Am I the only one that fails to understand this logic?

Re: Hardest Shooting Robots
 

Nope, sounds like crazy people acting crazy.

Re: Hardest Shooting Robots
 

No, you're not alone there. I'm questioning whether this actually happened.

Re: Hardest Shooting Robots
 

$@#$@#$@#$@#, that's meta

Re: Hardest Shooting Robots
 

Shooting hard is nice until you miss and the ball ends up in the opponent's courtyard. When designing shooters, I don't think anyone plans on missing, though.

Re: Hardest Shooting Robots
 

My team was able to shoot pretty hard by the end of the season. We originally had two mini cims, each geared 1:1.67, running 4" grey Andy Mark Stealth Wheels. It compressed it to 7.5" roughly. After our first event, we took the gearboxes off so it was 1:1. We switched the gray wheels to black ones, gripper, then doubled them up. This created more contact surface. Between the torque of the mini cims and surface area/ compression, we could launch some boulders with force. I just wish we would have had more time to experiment with wheels.