View Full Version : How fast can your robot shoot?
Joe_Widen
12-02-2006, 15:59
Team 1675 was having some fun Saturday and we loaded a 10 foot tube up with 15 poofballs. We shot them all in about 4 adn a half seconds. Thats are record......whats yours? I'll try to get a video up soon.
Tomasz Bania
12-02-2006, 16:13
we shot around 4 balls a second (16 balls over 4 seconds). I'm not on our manipulations team, but that's the fastest I saw it go. Mind you that the feeder fed the balls that quickly. On the robot, it can shoot about 10 balls in 2 1/2 to 3 1/2 seconds.
Ours wasn't as fast as yours...
Here's a vid: (also posted in this thread (http://www.chiefdelphi.com/forums/showthread.php?t=43841&highlight=1523+video))
http://marsbot.org/files/shooting.wmv
Joe_Widen
12-02-2006, 16:24
That is definately the neatest looking robot I've seen this year. How did you guys get it to do that. It looks like you had a high torque motor and a surgical tubing rig. That looks really good, except how do you plan to get more balls into the feeder, are you going to bend some aluminum and make it like a slide of some sort?
Team ERV
12-02-2006, 18:02
wow guys that looks pretty awesome....but does it come under that rule with the projectile?
For all our balls to go the same distance, we need ~1/2 second between balls (might be slightly more now, gearing was changed). We figure with constant tracking this is fine though, especially since I don't see us storing 80 balls we need to launch at once.
Nate Laverdure
12-02-2006, 19:13
Oh, that's an easy question. Ours shoots as fast as the balls can get to the shooter.
Seriously, I'm not sure how many balls it can shoot in whatever time limit. What I do know, though, is that the tangential velocity of the shooting wheels is about 80 mph. The ball gets shot through the wheels at 60 mph (there's some slippage), then it goes through a vertical tube to our turret which slows it to more or less 28 mph.
Tim Arnold
12-02-2006, 19:28
That is definately the neatest looking robot I've seen this year. How did you guys get it to do that. It looks like you had a high torque motor and a surgical tubing rig. That looks really good, except how do you plan to get more balls into the feeder, are you going to bend some aluminum and make it like a slide of some sort?
You guessed right on how it works, but we are planning on using a hopper of sorts (hint: basketball) to allow human loading as well as a small ammount of onboard storage.
wow guys that looks pretty awesome....but does it come under that rule with the projectile?
I don't know what rule you are talking about in particular, but the only rule we were concened about was about stored energy. This problem was eliminated as the surgical tubing pulls the arm back to the point of lowest energy.
Oh, that's an easy question. Ours shoots as fast as the balls can get to the shooter.
Seriously, I'm not sure how many balls it can shoot in whatever time limit. What I do know, though, is that the tangential velocity of the shooting wheels is about 80 mph. The ball gets shot through the wheels at 60 mph (there's some slippage), then it goes through a vertical tube to our turret which slows it to more or less 28 mph.
That sounds very impressive. I would love to a video of it in action! How long is the delay between balls for accuracy; none?
Joe_Widen
12-02-2006, 19:52
Our launcher can shoot as fast as we can load them also. Once we get to around the 10th or 11th ball, they start to shoot a bit shorter(the 15th ball we shot in the four second span hit the ground at 26 ft from the shooter). Also its very accurate. Good Luck to everyone and ill try to post some pictures or videos tomorrow.
RebelWithARobot
16-02-2006, 11:00
i believe we will be firing around 10 balls per second
Elgin Clock
16-02-2006, 12:13
I'm hoping we shoot balls under the speed limit.
It was spinnin' pretty darn fast the other night. :ahh:
I believe that our robot can shoot at least 10 balls per second, but we probably won't be doing that at the competition because well... it is very possible for BAMFR(our robot) to shoot 2 balls at the same time!
irishninja
17-02-2006, 17:39
on Friday we finally got our spiral integrated with our shooter. WE were pulsing the motors and got a ball per second. I believe that we shot two, waited one, shot two, etc. Id be interested to know a) how accurate that team that shot 15 in 4.5 seconds actually had and b) how much the distance was drastically changed. Loss of energy is not a good thing. Did those balls just flop out? Or did they shoot almost as well as the first one.
video (http://media.putfile.com/HPIM1510)
Ours is working pretty good and fast!!
check it out!
Joe_Widen
17-02-2006, 21:52
Ours didnt chage very drastically between the first and 15th ball. The only change was maybe 5 feet so i think were in good shape. Especially since we have an almost fool proof spreadsheet made by out GE mentor. Good Stuff. I dont have it with me so I can't upload it, but it makes robots alot less complex.
M Dawg1319
18-02-2006, 17:01
You guys do know that there is a velocity limit and from how fast you guys are shooting them you may be in violation. :yikes:
10balls in a matter of seconds? just wondering if it was moving less than 39m/s...like the rule states...at quincy, 1568 was maxing around 55m/s, we moved it down to 34m/s, now we have to work out some kinks with the low velocity :(
Elgin Clock
18-02-2006, 20:54
There is a FIRST measuring system in place for ball velocity testing.
It's basically 2 sets of 2 sensors making a beam, and you shoot through the sensors, and break the beams, and it calculates your speed.
Be ready to be inspected to this criteria, and change your max speed before you even step onto a field to compete.
Just a friendly heads up!
Good luck to all shooting under the speed limit!
Peter Matteson
18-02-2006, 21:16
There is a FIRST measuring system in place for ball velocity testing.
It's basically 2 sets of 2 sensors making a beam, and you shoot through the sensors, and break the beams, and it calculates your speed.
Be ready to be inspected to this criteria, and change your max speed before you even step onto a field to compete.
Just a friendly heads up!
Good luck to all shooting under the speed limit!
1. Where did you hear this?
2. Duck hunt gun? Really?
Sgraff_SRHS06
18-02-2006, 21:21
1. Where did you hear this?
2. Duck hunt gun? Really?
1. I have no answer for the inspection. The speed limit is in the manual.
2. It means FIRST is playing Nintendo with us.
lil' kim
18-02-2006, 21:26
were flirting with legal on velocity but we took it to a basketball game at our school tonight and shot freethrows and it works really well.
Joe_Widen
26-02-2006, 19:42
Yeh i think our team is just a bit over max speed so we'll have to talk to the programmers. We're using a fatty cim (minibike) at full speed with no reductions. We're using nylon gears and chain, and there seems to be no loss of speed everytime we shoot. So any ideas on what to do?
Eldarion
26-02-2006, 20:54
Does this thread imply "How fast are you able to shoot the balls", or is it "How fast are you able to shoot the balls accurately and reliably"?
If the former, 10 balls in a few seconds.
If the latter, 10 balls in 8 seconds. :)
Peter Matteson
27-02-2006, 07:32
Yeh i think our team is just a bit over max speed so we'll have to talk to the programmers. We're using a fatty cim (minibike) at full speed with no reductions. We're using nylon gears and chain, and there seems to be no loss of speed everytime we shoot. So any ideas on what to do?
Turn down the voltage with a spike.
vBulletin® v3.6.4, Copyright ©2000-2017, Jelsoft Enterprises Ltd.