View Full Version : Hardest Shooting Robots
Ginger Power
10-03-2016, 17:52
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?
ShadathChow
10-03-2016, 18:34
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
Monochron
10-03-2016, 21:36
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.
Sorry to derail a bit, but what compression are you using with that setup?
Ginger Power
10-03-2016, 22:49
Sorry to derail a bit, but what compression are you using with that setup?
3 inches
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?
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.
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.
Do you have any videos of it shooting?
Conor Ryan
11-03-2016, 15:02
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.
Can go in detail about the design and manufacturing process? Sounds like you are doing something very different from most teams.
hardcopi
11-03-2016, 15:24
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
jajabinx124
11-03-2016, 17:48
4009 DNA was shooting boulders pretty hard (https://youtu.be/Yc3epXRcX6s?t=70) at Lake superior.. (they are on red alliance)
CJ_Elliott
12-03-2016, 14:47
Did anyone see 5817's reveal?
jodge1706
12-03-2016, 22:32
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.
jajabinx124
13-03-2016, 00:44
taking about 245lbs of force to pull it back completely.
Holy cow..
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.
What are you using to pull that back, and how long does it take?
carpedav000
13-03-2016, 07:35
Ours is a puncher as well #teamclaw, but it "only" takes about 180-200 :p
Poseidon5817
13-03-2016, 08:19
Did anyone see 5817's reveal?
I think we are in the running for hardest shot. We broke the chains in the goal in one of our matches.
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.....
zinthorne
13-03-2016, 10:06
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.
Mike Schreiber
13-03-2016, 12:13
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.
<S02> Muzzle Velocity - No ROBOT may throw a ball with an exit velocity of greater than 12 m/s (26.8 mph).
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.
IronicDeadBird
14-03-2016, 14:07
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.
You know they are just called boulders they aren't actual boulders right?
jodge1706
14-03-2016, 14:25
What are you using to pull that back, and how long does it take?
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
jodge1706
14-03-2016, 14:27
You know they are just called boulders they aren't actual boulders right?
I think we forgot that when we were designing :yikes:
Trevor1523
14-03-2016, 14:33
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.
MrRoboSteve
14-03-2016, 14:33
Based on watching about 130 matches in person, I'm not entirely convinced that harder is better when shooting at the high goal.
IronicDeadBird
14-03-2016, 14:35
I think we forgot that when we were designing :yikes:
Well at least you have too much instead of too little, if you had too little power you would need to add MORE...
BrennanB
14-03-2016, 14:38
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.
They were pretty crazy. Probably a 75-100 ft shot outside of the field when they missed.
Holo3453
14-03-2016, 14:38
Team 3453 is using 775pro's with 2 inch stealth wheels.
Jared Russell
14-03-2016, 15:07
5817's "bench grinder" is absolutely the hardest shooter I have ever personally witnessed on an FRC robot...ever.
sdcantrell56
14-03-2016, 15:18
My response to this whole thread is... WHY?
MrTechCenter
14-03-2016, 15:28
My response to this whole thread is... WHY?
Why not?
IronicDeadBird
14-03-2016, 15:42
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
14-03-2016, 15:52
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
14-03-2016, 16:03
I'm guessing that a faster shot velocity would reduce the effects of drag
Pretty sure it would increase the effects of drag
sdcantrell56
14-03-2016, 16:19
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
15-03-2016, 00:06
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".
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
15-03-2016, 10:01
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
15-03-2016, 12:16
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
15-03-2016, 12:19
This thread needs videos.
Poseidon5817
15-03-2016, 12:20
This thread needs videos.
Here you go! (https://youtu.be/2CQId1lRpCA)
CJ_Elliott
15-03-2016, 12:22
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
15-03-2016, 12:25
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
15-03-2016, 12:27
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? :D
Poseidon5817
15-03-2016, 12:30
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
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
GreyingJay
15-03-2016, 12:32
Basically it's about trajectory. You want the flattest one so that when aiming, your shot is less dependent on the distance to target. Furthermore, the shot is less dependent on the condition of the game pieces.
Aha. That's what I was trying to get at with my (counter) intuition about dealing with factors affecting ball trajectory.
dkavanagh
15-03-2016, 13:00
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?
This thread needs videos.
Just a prototype that didn't end up getting used, but here you go: https://drive.google.com/file/d/0Bzxb6Sc9JUtgVGZsdXptd284WnM/view?usp=sharing
Michael Corsetto
15-03-2016, 14:58
Just a prototype that didn't end up getting used, but here you go: https://drive.google.com/file/d/0Bzxb6Sc9JUtgVGZsdXptd284WnM/view?usp=sharing
The reactions in this video are fantastic.
tickspe15
15-03-2016, 17:17
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?list=PLrE0JKMRgg6An0ZOt8CXQSRbiXWyekewe
The other Gabe
15-03-2016, 18:32
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
How about a 200mph shot? (https://www.youtube.com/watch?v=0y6uvBfEKfg)
Richard Wallace
11-05-2016, 14:32
Gratuitous slo mo FTW.
Thayer McCollum
11-05-2016, 15:25
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.
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 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?
AdamHeard
11-05-2016, 16:11
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?
Nope, sounds like crazy people acting crazy.
The catapult was powered by four 500lb springs. ---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.
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?
No, you're not alone there. I'm questioning whether this actually happened.
araniaraniratul
11-05-2016, 16:21
Here you go! (https://youtu.be/2CQId1lRpCA)
$@#$@#$@#$@#, that's meta
XaulZan11
11-05-2016, 16:31
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.
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.
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