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-   -   Team 125 Ball Shooter Prototype! (http://www.chiefdelphi.com/forums/showthread.php?t=41739)

Brandon Holley 13-01-2006 19:05
Re: Team 125 Ball Shooter Prototype!
 
http://nutrons.dbrl.net/brandon/

there ya go, a site that can actually handle these vids!! Keep the comments coming!

CatchRothy22 15-01-2006 19:20
Re: Team 125 Ball Shooter Prototype!
 
Brandon get outta here with your 125 bs! Nice videos, I can hear conry in the big air one. :p We miss you guys. Come back to MO one day.

kasemodz 19-01-2006 22:04
Re: Team 125 Ball Shooter Prototype!
 
hey, one question, how did you guys determine the right curvature of the ramp? You guys must have calculated the pressure needed on the ball. How did you'll figure it out?

Alekat 19-01-2006 22:12
Re: Team 125 Ball Shooter Prototype!
 
Quote:
Originally Posted by Rick TYler
I know we are supposed to be, like, all sekrit and stuff about what we are doing, but this is the biggest reason I like a belt-driven launching system. Combined with an encoder and a high-torque motor system (big CIM, anyone?) I believe a long belt (something like 24") will give more consistent launches -- both in terms of orientation and in velocity. We are prototyping right now, and, if it won't violate the FIRST secrecy oath, I'll share our results when we are done.
As long as your feeder and shooter mechanisms are consistent, is there any reason to get inconsistent launches?

Rick TYler 20-01-2006 00:29
Re: Team 125 Ball Shooter Prototype!
 
Quote:
Originally Posted by Alekat
As long as your feeder and shooter mechanisms are consistent, is there any reason to get inconsistent launches?
A lot has changed in the last six days... I hypothesized last week that the balls would behave chaotically when launched from a one-wheeled launcher. Since the balls were going to get gripped in slightly different attitudes, and might expand differently as they come off the launching wheel, I thought they would tend to scatter. After empircal testing of four launching systems, we have found that even the humble one-wheel launcher puts them in the pretty much the same place time after time. It seems like the slow rebound of the viscoelastic-ish foam doesn cause the same problems I thought we might get from a ball with more bounciness.

Ceal Craig 21-01-2006 00:01
Re: Team 125 Ball Shooter Prototype!
 
Quote:
Originally Posted by DKolberg
with a 6" dia wheel and 2250 rpm you exceeded the max velocity. 2250 with a 6" wheel is 58.90 ft/sec or 17.95 m/sec and the limit is 12 m/sec. :eek:
We've been assuming with only one wheel for a shooter, that the calculations are theoretically half of what you calculated. Thus for only one wheel in the configuration you describe we think it might be close to 9 m/sec.

That's our thought anyway. We have a spreadsheet set up that lets you plug in any of two variables (out of three): exit velocity, RPM, diameter of wheel and then see all the other results. I'm happy to send it to anyone who wants it.

TEAM456MS 21-01-2006 00:07
Re: Team 125 Ball Shooter Prototype!
 
One question, how do you plan on aiming during the game with 5 other robots in play?


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