Go to Post The pie is as large as you make it. - boomergeek [more]
Home
Go Back   Chief Delphi > Technical > Technical Discussion
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
View Poll Results: How does your robot posess the ball?
Roller (Ball magnet) 123 65.78%
Vacuum 35 18.72%
Armature 0 0%
We do not intend to posess the ball 11 5.88%
We did not ship a posession device, and will decide before competition 18 9.63%
Voters: 187. You may not vote on this poll

 
 
Thread Tools Rate Thread Display Modes
Prev Previous Post   Next Post Next
  #35   Spotlight this post!  
Unread 29-03-2010, 12:17
Tom Line's Avatar
Tom Line Tom Line is offline
Raptors can't turn doorknobs.
FRC #1718 (The Fighting Pi)
Team Role: Mentor
 
Join Date: Jan 2007
Rookie Year: 1999
Location: Armada, Michigan
Posts: 2,541
Tom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond reputeTom Line has a reputation beyond repute
Re: Ball posession: Roller (ball magnet) or vacuum?

Quote:
Originally Posted by Ether View Post
Of course. There is more than one way to skin a cat.

Two-roller ball magnet designs in which the ball does not rotate continuously when possessed have already been described in this thread:

http://www.chiefdelphi.com/forums/sh...0&postcount=63

http://www.chiefdelphi.com/forums/sh...2&postcount=60

http://www.chiefdelphi.com/forums/sh...9&postcount=56

Question for you: is the lower bar in your design fixed or is it free to spin?


~
As you said, there's always more than one way to skin a cat (I'm going to have to look up where that euphemism came from: it isn't the more pleasing when you think about it ).

However, "trapping" the ball, as it were, rather than spinning it, makes a much easier system. You don't have to worry about roller speed, you don't have to worry about moderating your back up or turning speed, you don't have to worry about the ball rolling off sideways when you turn, you don't have to worry about differing ball surfaces or differing carpet cof's.

In fact, all you need is a small motor driving the top bar and you're set. That's why we chose that system.

I've seen excellent backward-ball-spinnering systems too, however we found that going that direction took a more powerful motor that we wanted to use elsewhere, as well as all the considerations I listed above.
 


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
Ball Magnet MrForbes General Forum 54 02-02-2010 17:04
842 ball roller falconmaster General Forum 3 02-02-2010 12:44
pic: Kit ball vs. New ball kborer22 Extra Discussion 15 09-02-2009 09:15
Knocking off a ball while possesing a ball Joe Ross Rules/Strategy 25 10-03-2008 18:49
WHere do you get Ball Casters/ BAll Transfers for FRC?!?!?!? leehyungjin4u General Forum 3 15-01-2008 23:27


All times are GMT -5. The time now is 01:40.

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