Go to Post Cut it out with the paper airplanes! Frank hath spoken! - cgmv123 [more]
Home
Go Back   Chief Delphi > FIRST > General Forum
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
 
 
Thread Tools Rate Thread Display Modes
Prev Previous Post   Next Post Next
  #22   Spotlight this post!  
Unread 09-08-2013, 00:58
donkehote's Avatar
donkehote donkehote is offline
Design/Manufacture/Strategy Mentor
AKA: Kevin
FRC #5031
Team Role: Mentor
 
Join Date: Mar 2013
Rookie Year: 2006
Location: Toronto
Posts: 89
donkehote is just really nicedonkehote is just really nicedonkehote is just really nicedonkehote is just really nice
Re: Upside down Frisbees; can your team get them out?

1310 had this issue all the way up until after the first match at champs. That was the only qual we lost, as we jammed at about the 1:40 mark, and ended up loosing by 2 points. Had it not been for that jam, we would have had #1 seed on curie, and things on that field would have been totally different.
http://www.youtube.com/watch?v=rfqeoMx0GeI
4814 pushes us into an upside down disk, then the wall. we normally cant pick up upside down ones, but with the walls help it went in at 1:36. it has difficulty going through the pickup, but makes it out the top from 1:36-1:39. we fire the 2 disks we picked up before that, then we jam for the rest of the match. If you cant tell, i have watched this match in detail multiple times to see exactly how it happened.

First a little background.

Our hammer (the part that pushed the Frisbee into the wheel) engages the outer edge of the Frisbee, and is powered by a spring out, air in piston. our hammer is a bent piece of 1.5" wide, 1/16th aluminium. The bend on the top was just enough to lift an upside down Frisbee, as it impacts right at the curve. this would cause our robot to be a glorified "dishwasher" as our students called it. We came up with the solution before champs, but reluctant to change things, we didn't implement it, as it had only happened once or twice all season. It was such a simple fix, and i bet it would work for any team with this issue and an external hammer.

The solution? A self tapping screw at the right height through our hammer. It is sharp enough to catch the rounded edge of the Frisbee, and eject it. the first time we tried it, it was magic. consistent ejection of upside down Frisbee's at a minimal weight gain. The screw needs to be for wood, as the tip is sharper.
Reply With Quote
 


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


All times are GMT -5. The time now is 06:40.

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