Go to Post I know nothing. - Erin Rapacki [more]
Home
Go Back   Chief Delphi > Competition > Rules/Strategy
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Closed Thread
 
Thread Tools Rate Thread Display Modes
  #1   Spotlight this post!  
Unread 08-01-2006, 15:14
Ian Curtis Ian Curtis is offline
Best Available Data
FRC #1778 (Chill Out!)
Team Role: Engineer
 
Join Date: Feb 2005
Rookie Year: 2004
Location: Puget Sound
Posts: 2,521
Ian Curtis has a reputation beyond reputeIan Curtis has a reputation beyond reputeIan Curtis has a reputation beyond reputeIan Curtis has a reputation beyond reputeIan Curtis has a reputation beyond reputeIan Curtis has a reputation beyond reputeIan Curtis has a reputation beyond reputeIan Curtis has a reputation beyond reputeIan Curtis has a reputation beyond reputeIan Curtis has a reputation beyond reputeIan Curtis has a reputation beyond repute
Re: Best Way to Shoot the Balls??

Quote:
Originally Posted by Rex114
Just a random thought about this whole barrel getting the ball to spin discussion. Is a barrel really necessary? If you look at a pitching machine, once the ball goes through the one or two wheels that propel it foreward, it doesn't go through anything else. I understand that a barrel would perhaps put a corkscrew spin on the ball, thus making it more accurate, but when the wheel(s) make contact with the ball, wouldn't it negate any spin that was there before? And if you are left with just the spin that the wheel(s) produce on the ball, isn't that a constant spin that you can factor in when you aim you shooter? That's just my two cents.

Michael C.
That might be true shooting heavy small objects, but we are launching large light objects. With the spin the ball expeiriences being launched, and with the lightness of the ball, those balls will be going every which way immediately after they go through the launcher. The game will come down to who can shoot their balls with the highest accuracy percentage.
__________________
CHILL OUT! | Aero Stability & Control Engineer
Adam Savage's Obsessions (TED Talk) (Part 2)
It is much easier to call someone else a genius than admit to yourself that you are lazy. - Dave Gingery
  #2   Spotlight this post!  
Unread 08-01-2006, 16:05
Seekthematrix Seekthematrix is offline
Registered User
FRC #1257
 
Join Date: Apr 2005
Location: New Jersey
Posts: 14
Seekthematrix can only hope to improve
Re: Best Way to Shoot the Balls??

well they give us those super cims(thats wat our team are calling them) anyone actually know the names of those motors. Those things could probley power a scooter. But a double belt system working on one of the motors or a one belt up inside a large barrel it would be fast accurate and easy to feed, with very little fear of jamming.

Last edited by Seekthematrix : 08-01-2006 at 16:08.
  #3   Spotlight this post!  
Unread 08-01-2006, 17:19
Not2B's Avatar
Not2B Not2B is offline
Registered User
AKA: Brian Graham
FRC #0862 (Lightning Robotics)
Team Role: Mentor
 
Join Date: Apr 2002
Rookie Year: 2002
Location: Farmington Hills, Mi
Posts: 401
Not2B has a reputation beyond reputeNot2B has a reputation beyond reputeNot2B has a reputation beyond reputeNot2B has a reputation beyond reputeNot2B has a reputation beyond reputeNot2B has a reputation beyond reputeNot2B has a reputation beyond reputeNot2B has a reputation beyond reputeNot2B has a reputation beyond reputeNot2B has a reputation beyond reputeNot2B has a reputation beyond repute
Re: Best Way to Shoot the Balls??

If you do a two-wheeled shooter (or two belt or whatnot), you could run the wheels at different speeds to put a backspin on the ball. Not all spin has to be like a spiraled football.

Making sure you get your wheels back up to speed before putting another ball it will be huge. High RPM and low torque wheels will slow down.

Who's taking a field trip to a batting cage?
__________________
Brian Graham
  #4   Spotlight this post!  
Unread 09-01-2006, 01:16
Jeremiah Johnson's Avatar
Jeremiah Johnson Jeremiah Johnson is offline
Go VOLS!!
AKA: Budda648
no team (QC Elite)
Team Role: Alumni
 
Join Date: Mar 2003
Rookie Year: 2002
Location: Davenport, IA
Posts: 1,476
Jeremiah Johnson has a reputation beyond reputeJeremiah Johnson has a reputation beyond reputeJeremiah Johnson has a reputation beyond reputeJeremiah Johnson has a reputation beyond reputeJeremiah Johnson has a reputation beyond reputeJeremiah Johnson has a reputation beyond reputeJeremiah Johnson has a reputation beyond reputeJeremiah Johnson has a reputation beyond reputeJeremiah Johnson has a reputation beyond reputeJeremiah Johnson has a reputation beyond reputeJeremiah Johnson has a reputation beyond repute
Send a message via AIM to Jeremiah Johnson Send a message via MSN to Jeremiah Johnson
Re: Best Way to Shoot the Balls??

I see no reason why you would need to shoot quickly if you have an accurate launching system. A barrel is probably necessary though. In my opinion, a pneumatic system would work best. There's less chance of unpredictable velocity... maybe. I donno though. I'm not the mechanical type. I just throw out ideas.
  #5   Spotlight this post!  
Unread 10-01-2006, 22:29
Kevin_547 Kevin_547 is offline
Registered User
FRC #0547
 
Join Date: Jan 2006
Location: Tennessee
Posts: 12
Kevin_547 is an unknown quantity at this point
Re: Best Way to Shoot the Balls??

it seems that most ppl are toying with the softball pitcher idea to shoot that balls. which i think is a very good way of doing so but how is everyone thinking how u are going to get the balls from ur holding area to the wheel to shoot without over loading ur gun or shooter or w/e u want to call it.
  #6   Spotlight this post!  
Unread 10-01-2006, 22:32
EricH's Avatar
EricH EricH is offline
New year, new team
FRC #1197 (Torbots)
Team Role: Engineer
 
Join Date: Jan 2005
Rookie Year: 2003
Location: SoCal
Posts: 19,825
EricH has a reputation beyond reputeEricH has a reputation beyond reputeEricH has a reputation beyond reputeEricH has a reputation beyond reputeEricH has a reputation beyond reputeEricH has a reputation beyond reputeEricH has a reputation beyond reputeEricH has a reputation beyond reputeEricH has a reputation beyond reputeEricH has a reputation beyond reputeEricH has a reputation beyond repute
Re: Best Way to Shoot the Balls??

Quote:
Originally Posted by Kevin_547
how is everyone thinking how u are going to get the balls from ur holding area to the wheel to shoot without over loading ur gun or shooter or w/e u want to call it.
That remains to be figured out, assuming teams use a holding area. One of our engineers had an idea, but what that is is a secret.
__________________
Past teams:
2003-2007: FRC0330 BeachBots
2008: FRC1135 Shmoebotics
2012: FRC4046 Schroedinger's Dragons

"Rockets are tricky..."--Elon Musk

  #7   Spotlight this post!  
Unread 10-01-2006, 22:35
Masterfork's Avatar
Masterfork Masterfork is offline
Joshua Hunnings
AKA: Fork
FRC #0233 (the pink team)
Team Role: Alumni
 
Join Date: Feb 2005
Rookie Year: 2005
Location: Florida
Posts: 122
Masterfork is a jewel in the roughMasterfork is a jewel in the roughMasterfork is a jewel in the rough
Send a message via AIM to Masterfork Send a message via MSN to Masterfork
Re: Best Way to Shoot the Balls??

Quote:
Originally Posted by EricH
That remains to be figured out, assuming teams use a holding area. One of our engineers had an idea, but what that is is a secret.
well that is what peoples creativity comes in which will be interesting
__________________

2007 World Championship Finalist thank you 71 and 179
2007 Archimedes undefeated Champions thanks 179 and 71
2007 Florida regional semifinalist thanks 180 and 1889
2007 Florida regional Spirit Award
2006 Archimedes Division Finalist
2006 Boston Champions
2005 UCF Regional champions thanks 1592 and 179
2005 Colorado Regional champions thanks 118 and 935
2005 Colorado Regional Chairmans Award
IRI 2005 - Champion thanks to 33 and 868 - it was a GREAT event
2005 World Championship - GM Industrial Design
  #8   Spotlight this post!  
Unread 10-01-2006, 22:57
Kelvin Ng Kelvin Ng is offline
Registered User
None #1558 (ACCIDENT Robotics (Albert Campbell Collegiate Institute stuD)
Team Role: Alumni
 
Join Date: Jan 2005
Rookie Year: 2005
Location: toronto, ON
Posts: 92
Kelvin Ng is on a distinguished road
Re: Best Way to Shoot the Balls??

my dad had some awesome ideas. I just wonder about jamming. Is it possible that a pile of balls may interfere with each other's ability to load? Kind of like how 2 balls may get stuck in a funnel and neither actually falls into the hole that is designed to fit one? If that is unclear, sorry I'm not the best person at explaining things.

Is probably best for the shooters if the balls are stored single file to prevent jamming. Boy, I want to go present all my ideas to my old school's team, but as an alumni(us) (which is singular?) I want to leave all the creativity to the students. I just hope they ask me for ideas =).

BTW.

if anybody does not want to use baseball-style guns to fire, I experimented with a scaled down catapult made out of lego. It uses a couple elastics (the more elastics/springs, the more stored energy), to store energy, and the accuracy is surprisingly good. I was able to score little blocks of lego in the 1 foot diametre lego basket from approximately 2 metres away at nearly 100% accuracy. However, there was some awesome recoil from that thing.
__________________
2006

2005 - Waterloo Regional Highest Rookie Seed
2005 - Theory6 (1241) Top Rookie 2005

Last edited by Kelvin Ng : 10-01-2006 at 22:59.
  #9   Spotlight this post!  
Unread 11-01-2006, 12:42
insub2 insub2 is offline
Registered User
None #1227
 
Join Date: Jan 2005
Location: Grand Rapids
Posts: 21
insub2 is an unknown quantity at this point
Re: Best Way to Shoot the Balls??

Quote:
Originally Posted by Kelvin Ng
I just wonder about jamming. Is it possible that a pile of balls may interfere with each other's ability to load? Kind of like how 2 balls may get stuck in a funnel and neither actually falls into the hole that is designed to fit one? If that is unclear, sorry I'm not the best person at explaining things.
it is possible to have two balls jam. the teams will just have to design a way around that. stored single file, yes, or a take a field trip to some factories. i did some temp work on an assembly line one summer and was amazed by all the machines used to move things around. a few that come to mind as aplicable would be a pinwheel on the bottom of the hopper to break up jams if they were to occur or a slowly contracting space (like a funnel but with steeper sides).
  #10   Spotlight this post!  
Unread 13-01-2006, 12:12
Eria4044 Eria4044 is offline
Registered User
None #0935 (Railerobotics)
Team Role: Webmaster
 
Join Date: Jan 2005
Rookie Year: 2004
Location: Newton, Kansas
Posts: 326
Eria4044 is on a distinguished road
Send a message via Yahoo to Eria4044
Re: Best Way to Shoot the Balls??

One of my teammates had the idea to have two spinners (like in old Hot Wheels tracks) in the barrel to accelerate the ball and prevent spin from killing accuracy.
__________________
Team 935 web team captain.
The team website: http://www.railerobotics.com/
  #11   Spotlight this post!  
Unread 13-01-2006, 12:27
Stu Bloom's Avatar
Stu Bloom Stu Bloom is offline
I REALLY want to be Andy Baker
FRC #1018 (RoboDevils)
Team Role: Mentor
 
Join Date: Dec 2002
Rookie Year: 2002
Location: Indianapolis, IN
Posts: 662
Stu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond reputeStu Bloom has a reputation beyond repute
Send a message via AIM to Stu Bloom Send a message via Yahoo to Stu Bloom
Re: Best Way to Shoot the Balls??

Actually a spin on the ball will improve accuracy, probably backspin or spiral would be the best. In baseball the erratic behavior of a knuckleball pitch is due to the fact that it has little or no spin. It has to do with turbulence of the air around the ball, but since I don't use that stuff at work (and its been a LONG time since I was in school) I am unable to regurgitate any specific details.
__________________
Stuart Bloom
Mechanical Engineer
Rolls-Royce Corporation
FIRST Team 1018 - Pike HS RoboDevils
My activity for 2012:
  • Boilermaker planning committee
  • Israel Head Ref - DONE (and it was FANTASTIC!)
  • Boilermaker Regional (with 1018) - DONE
  • Midwest Head Ref - DONE
  • WORLD Championships (with 1018) - DONE
  • IRI Head Ref - DONE
  • CAGE Match Head Ref
  #12   Spotlight this post!  
Unread 14-01-2006, 09:59
Eria4044 Eria4044 is offline
Registered User
None #0935 (Railerobotics)
Team Role: Webmaster
 
Join Date: Jan 2005
Rookie Year: 2004
Location: Newton, Kansas
Posts: 326
Eria4044 is on a distinguished road
Send a message via Yahoo to Eria4044
Re: Best Way to Shoot the Balls??

Really? I assumed that, if you spun the ball one way, it would veer off to one side once out of the barrel. Or you could make a long barrel, which would have problems of its own. Maybe it was my analogy at one meeting that the balls were like musket balls. Maybe I just need more sleep.
__________________
Team 935 web team captain.
The team website: http://www.railerobotics.com/

Last edited by Eria4044 : 14-01-2006 at 11:03.
  #13   Spotlight this post!  
Unread 14-01-2006, 10:44
BrianR BrianR is offline
Registered User
AKA: Brian Roehl
FRC #1525 (Warbots)
Team Role: Electrical
 
Join Date: Jan 2006
Rookie Year: 2005
Location: Deerfield, IL
Posts: 79
BrianR has a spectacular aura aboutBrianR has a spectacular aura about
Send a message via AIM to BrianR
Re: Best Way to Shoot the Balls??

I agree with Eria, because when you think of spin on something like a football, that helps to prevent different faces from being on the front, and thus pose different amounts of drag, causing the ball to tumble even worse. In the case of one of these balls, it is unclear if it will act like a baseball, because these have far less mass per unit of volume, and thus when accelerated have less momentum keeping them going forward. As the physics aren't totally clear, I asked my physics teacher about it, and he said to stay away from spin on this kind of ball. He didn't see the exact ball though, and I think the most definitive way to know how the ball will react to spin is to mock up a shooter and try it, which is what my team hopes to accomplish this weekend, among a million other things.
  #14   Spotlight this post!  
Unread 10-01-2006, 23:00
rufu5's Avatar
rufu5 rufu5 is offline
20something
FRC #6721 (Trailblazer Robotics)
Team Role: Mentor
 
Join Date: Feb 2003
Rookie Year: 2000
Location: Indiana
Posts: 177
rufu5 has much to be proud ofrufu5 has much to be proud ofrufu5 has much to be proud ofrufu5 has much to be proud ofrufu5 has much to be proud ofrufu5 has much to be proud ofrufu5 has much to be proud ofrufu5 has much to be proud ofrufu5 has much to be proud of
Send a message via AIM to rufu5
Re: Best Way to Shoot the Balls??

Is there a limit to the amount of force we are allowed to have stored in a spring on the robot? or does the projection of the ball by that method just have to follow the 12m/s rule?
__________________
have no fear of perfection, you will never reach it.
-Salvador Dali
  #15   Spotlight this post!  
Unread 10-01-2006, 23:13
WebWader125
 
Posts: n/a
Re: Best Way to Shoot the Balls (Power?)

Has anyone figured out how much power it will take to keep a softball-style shooter going? Seems like all that freewheeling would kill the battery.
Closed Thread


Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
POLL: have small balls been abandoned? Solace General Forum 44 04-09-2004 17:53
New Jersey Regional Status Aignam Regional Competitions 144 21-07-2004 17:04
Thoughts on the competiton balls Petey Regional Competitions 26 14-03-2004 09:31
Will ANYONE mess with the black balls? archiver 2001 0 23-06-2002 22:35
Just curious, how many robots could shoot or toss balls into the goal? Alan Ing General Forum 7 13-05-2002 19:09


All times are GMT -5. The time now is 04:52.

The Chief Delphi Forums are sponsored by Innovation First International, Inc.


Powered by vBulletin® Version 3.6.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright © Chief Delphi