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 Chief Delphi Are any teams planning on shooting the ball?
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#91
01-28-2008, 12:04 PM
 Guy Davidson Registered User AKA: formerly sumadin FRC #0008 (Paly Robotics) Team Role: Alumni Join Date: Mar 2005 Rookie Year: 2005 Location: Ra'anana, Israel Posts: 660
Re: Are any teams planning on shooting the ball?

Quote:
 Originally Posted by Qbranch FYI I used a little calculus to figure out a way to calculate trajectories. If you know how far down range and how far up you want the apex of the ball will be, my equations will tell you how fast and at what angle you have to shoot the ball. If you all are interested, I'll post a scan of my piece of notebook paper. -q
I'd be interested in seeing those equations. Math is always fun, especially when it's useful.
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#92
01-30-2008, 11:00 AM
 Tytus Gerrish IGAB, ADHD, and Dislexic AKA: Ty FRC #0179 Team Role: Tactician Join Date: Feb 2003 Rookie Year: 2001 Location: West Palm Beach, Florida Posts: 1,973
Re: Are any teams planning on shooting the ball?

Quote:
 Originally Posted by cgredalertcc We are capturing the ball using a vacuum lifting the ball so that our arm is slightly below the rack and firing the ball over using two back to back 3/4 inch bore by 10 inch stroke cylinders we've had success with shorter stroke but we want to be sure we get it over so we opted for the longest ones. The funny thing is the 3/4's extend way faster than the 1&1/2's and the ball really doesn't require that kind of force so we get a pretty good shot out of it.
Are you pulling a vacuum inside the air cylinder by extending it, then plugging the compressed end, and then cocking the piston my some mechanical means?
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#93
01-31-2008, 11:03 AM
 cgredalertcc Registered User AKA: Charlie Baxter FRC #1747 (Harrison Boiler Robotics) Team Role: College Student Join Date: Dec 2006 Rookie Year: 2005 Location: greenwood indiana Posts: 69
Re: Are any teams planning on shooting the ball?

we are generating a vacuum by the same means a shop vac would. We have been able to generate a vacuum of 26 inches of water using a multistage fan with the Fischer Price minus the gearbox. The conversion factor for vacuum is about 24 inches to 1 psi and based on the area of the cup we are using thats over 100 lbs of force on the ball. The rules specifically state that vacuums of this nature are permitted. I guess I wasn't clear in my explanation the cylinders are only for shooting the ball not pulling a vacuum. As of last night we decided to use three of the 3/4' bore cylinders to fire the ball.
#94
01-31-2008, 01:39 PM
 Furrah!! Registered User FRC #1425 Join Date: Jan 2008 Location: Oregon Posts: 8
Re: Are any teams planning on shooting the ball?

our team has decided to go with a "flinging plank" powered by surgical tubing. Our test have it flinging the ball around 8-10 feet in the air. We plan on using the momentum of the robot moving forward to create out trajectory. This launcher can also place the ball for end game consistently.
#95
01-31-2008, 03:24 PM
 Asiatique296 Registered User AKA: caro FRC #0296 (Northern Knights) Team Role: Mechanical Join Date: Feb 2007 Rookie Year: 2005 Location: Montreal Posts: 12
Re: Are any teams planning on shooting the ball?

Oui. L'équipe 296 de Montreal est entrain de fabriquer une catapulte pour lancer la balle par dessus la barre. On a deja lancé 9 pieds dans l'air plusieurs fois.
Les photos seront disponibles plus tard, car notre catapulte est top secret.

(Sorry about the french but i had to prove my Quebecness to my teammates. I know, its a horrible excuse, but it all makes sense to me.)
#96
01-31-2008, 08:58 PM
 Qbranch wow college goes fast. AKA: Alex Suchko FRC #1024 (Kil-A-Bytes) Team Role: Alumni Join Date: Apr 2006 Rookie Year: 2006 Location: Indianapolis Posts: 1,174
Re: Are any teams planning on shooting the ball?

Quote:
 Originally Posted by sumadin I'd be interested in seeing those equations. Math is always fun, especially when it's useful.
Ok, here's the (now well worn) piece of notebook paper that I did it on it Economics. Let's face it, the opportunity costs of doing it were very friendly since everyone can use a review of their calculus.

I'm sorry it's kind of hard to read in places, as i mentioned before it's not in the best shape anymore (has a few holes in it from folding/unfolding while we were designing our shooter). But, these equations have been empirically validated as accurate, so here you are. I know it got cut off but the top says "g should be put in negative" but you can see that in the test case down below anyhow.

Thankfully, the two really really important equations are clear and pretty easy to read Lymax is the Y location at which the trajectory peaks. Lx@ymax is the X location (how far down range) at which this Y peak (maximum height) occurs. The "test case" in the bottom 1/3 of the page shows an example using these equations.

If you have questions, please post. I realize it's hard to read, but it's also thankfully pretty high resolution, so just zoom in.

-q
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#97
02-02-2008, 09:42 PM
 EZE115 Registered User AKA: Estil Montero FRC #1660 (Harlem Knights) Team Role: Mentor Join Date: Jan 2008 Rookie Year: 2007 Location: New York City Posts: 3
Re: Are any teams planning on shooting the ball?

We Are and it works MUHAHAHA
#98
02-02-2008, 10:27 PM
 Captain Sugar Registered User AKA: Ben Cassidy FRC #2354 (Wheelie Bots) Team Role: Tactician Join Date: Jan 2008 Rookie Year: 2008 Location: Duncan, Oklahoma Posts: 7
Re: Are any teams planning on shooting the ball?

Our launcher is spring-loaded and can fire the ball upwards about 8 feet. This is after 3 other failed designs ("Wow! We got nearly a foot that run!").

Last edited by Captain Sugar : 02-02-2008 at 10:37 PM. Reason: misselling
#99
02-02-2008, 10:56 PM
 Kevin.Core Head Mechanical AKA: Kevin Meyer FRC #2062 (C.O.R.E. (Community of Robotic Engineers) Team Role: Mechanical Join Date: Mar 2007 Rookie Year: 2007 Location: Waukesha Posts: 13
Re: Are any teams planning on shooting the ball?

our primary focus is to make it around the field rather quickly while reserving the capability of lifting, and hurdling. A quick picture is posted in our showcase thread here. Should be a great game this year!

good luck!!
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#100
02-02-2008, 11:01 PM
 Chaos in a Can Joel Spadin FRC #1736 (Robot Casserole) Team Role: Programmer Join Date: Mar 2007 Rookie Year: 2007 Location: Peoria, IL Posts: 58
Re: Are any teams planning on shooting the ball?

We have a motor powered launcher.
It's basically one of the ever popular chain-driven elevated arms, but on steriods. And those steroid... they're on steroids too.

Due to what I'm assuming was a lack of decent squishy objects, our catapult's positive stop is currently cushioned with pink pencil erasers and duct tape.

During testing today, we could consistenly put the ball ~2 feet over the overpass.
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#101
02-06-2008, 06:14 PM
 TheNotoriousKid Dum Spiro, Spero AKA: Shane O FRC #0025 (Raider Robotix) Team Role: Mechanical Join Date: Jan 2005 Rookie Year: 2004 Location: North Brunswick Posts: 55
Re: Are any teams planning on shooting the ball?

I see every team at the "finish lines" crankin up a catapult to launch a 7.3lbs ball, and it actually scares me.
#102
02-06-2008, 07:04 PM
 ChrisMcK2186 Typer of doom AKA: Chris McKenzie FRC #2186 (Westfield Robotics) Team Role: Leadership Join Date: Jan 2007 Rookie Year: 2007 Location: Centreville Posts: 193
Re: Are any teams planning on shooting the ball?

Our ball recently got rabies, so I have to take it out back and shoot it

He don't actually plan to hurdle it, but our "manipulator type thingy" will make the ball pop up at some point in the game.

Chris McKenzie
2186
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battles."
Dean Kamen-"It does lead to kids building robots, and they do compete in the sport but we also teach the kids gracious proffesionalism, so while the robots are competing, they do it in a very, very gracious way."

Darn, I got into this for the battles!
#103
02-07-2008, 06:09 AM
 martin417 Opinionated old goat AKA: Martin Wilson FRC #4509 (Mechanical Bulls) Team Role: Mentor Join Date: Feb 2008 Rookie Year: 2008 Location: Buford, GA Posts: 537
Re: Are any teams planning on shooting the ball?

We are also using a vacuum manipulator to control the ball, and Bimba cylinders to shoot. We have found several important things:

Leave the vacuum on to shoot, you get better distance (if your cylinders can overcome the vacuum)

Ball inflation makes a huge difference in ball travel! Soft balls don't shoot very well!
#104
02-08-2008, 12:17 PM
 feliks_rosenber Félix AKA: Mentor of Teams #2217 & #2669 FRC #2217 (FOMHA & KY Bots) Team Role: Mentor Join Date: Jan 2007 Rookie Year: 2007 Location: Kiriat-Motzkin, Israel Posts: 207
Re: Are any teams planning on shooting the ball?

To all the teams which plan on shooting the ball:

Team 2669 KY Bots from Kiryat Yam, Israel has prepared a simple presentation with suggestions from FIRST on how to insure safety when building a launching mechanism.

It is called "Safe Shooter"

http://www.chiefdelphi.com/media/papers/2082

And remember, safety FIRST!
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#105
02-14-2008, 11:01 AM
 AHepperla Oh yeah, you know it... AKA: Wheels FRC #2202 (B'East Robotics) Team Role: Programmer Join Date: Jan 2008 Rookie Year: 2007 Location: Brookfield Posts: 8
Re: Are any teams planning on shooting the ball?

our initial design went bust so we are now lifting it and then launching it (our initial design would've flipped the robot...)

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