Go to Post 22 motors? Challenge Accepted. - gyroscopeRaptor [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
  #34   Spotlight this post!  
Unread 29-03-2010, 11:30
thefro526's Avatar
thefro526 thefro526 is offline
Mentor for Hire.
AKA: Dustin Benedict
no team (EWCP, MAR, FRC 708)
Team Role: Mentor
 
Join Date: Aug 2006
Rookie Year: 2005
Location: New Jersey
Posts: 2,599
thefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond reputethefro526 has a reputation beyond repute
Send a message via AIM to thefro526 Send a message via MSN to thefro526
Re: Ball posession: Roller (ball magnet) or vacuum?

Here's a picture of our ball possessor: http://www.chiefdelphi.com/media/photos/35345?

Basically, on either side is a set of wheels that spin inward towards the robot. As we contact a ball the wheels attempt to drive the ball inward towards the robot until they physically cannot, at which point the ball is pinched into the mechanism. At that point the ball is pinched in the mechanism and can't escape unless the mechanism is powered in reverse or the kicker is fired. We used a window motor for this so that we wouldn't have to stall the motor to keep the ball pinched in place, but this could be replicated with any motor as long as you come up with some system to prevent the motor from burning out.

There are two down falls to this sort of mechanism though, the first of them being the opening size of the pincher. The effective opening is similar to that of a suction cup so it requires a certain degree of precision to grab a ball. We found that as long as the center line of the ball is within ~4" of the center line of the robot we're fine. The second down fall is that I mounted the possessor rigidly to the frame of our robot. This can and did lead to at least one carrying penalty because the ball can leave the floor as we drive into the Goal, and also as we encounter bumps in the playing field. We plan to revise the design for the Championship to make it both more robust and "Carry-Proof"
__________________
-Dustin Benedict
2005-2012 - Student & Mentor FRC 816
2012-2014 - Technical Mentor, 2014 Drive Coach FRC 341
Current - Mentor FRC 2729, FRC 708
 


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