How fast can your robot shoot?

[MARS-CJ]

Ours wasn't as fast as yours...

Here's a vid: (also posted in this thread)
http://marsbot.org/files/shooting.wmv

[Joe_Widen]

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]

wow guys that looks pretty awesome....but does it come under that rule with the projectile?

[Donut]

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]

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]

Originally Posted by Joe_Widen

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.

Originally Posted by Team ERV

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.

Originally Posted by Nate Laverdure

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]

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]

i believe we will be firing around 10 balls per second

[Elgin Clock]

I'm hoping we shoot balls under the speed limit.
It was spinnin' pretty darn fast the other night.

[Nita]

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]

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.

[natis]

video
Ours is working pretty good and fast!!
check it out!

[Joe_Widen]

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.

[akshar]

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]

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!