Go to Post Robot teams will expand to fill the available space. - topgun [more]
Home
Go Back   Chief Delphi > Old Forum Archives > 2000
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
  #10   Spotlight this post!  
Unread 23-06-2002, 22:39
archiver archiver is offline
Forum Archival System
#0047 (ChiefDelphi)
 
Join Date: May 2001
Location: Pontiac, MI
Posts: 21,214
archiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond reputearchiver has a reputation beyond repute
Ungh

Posted by Dodd Stacy.

Engineer on team #95, Lebanon Robotics Team, from Lebanon High School and CRREL/CREARE.

Posted on 1/17/2000 2:02 PM MST


In Reply to: Re: How many robots on the bar in one match? posted by Quentin Lewis on 1/17/2000 10:50 AM MST:




: I am not a Mechanical Engineer, and I suppose it depends on whether they grab the bar closer to the center, or towards the ands....but I wonder if the bar could actually hold about 500 pounds? (Anyone know?)

Four 130 lb robots hanging from the center of the bar would deflect the bar about 1.6 inches and induce a peak stress in the pipe (at the center) of about 53,000 psi. That might be enough to cause a plastic (permanent) deformation of the bar, depending on the grade and quality of the steel in the particular pipe (it's not real highly specified material). The stress comes down quickly for less conservative cases, like with four bots hung 2 by 2, fewer than 4 bots, etc. I think FIRST's position that they'll replace the bar if it bends is probably a reasonable gamble. The peak stress would come down to about 43,000 psi if they used SCH 80 (heavier wall) pipe, which I suspect they would do if one does get bent.

So I say we all take it as a challenge to BEND THE BAR! It might help if at least one bot in the pile built in the capability to bounce while they're hanging. Right about 2.5 bounces per second (quicker if we can't all pile in the middle) gets everything resonating and the bar is toast.

Dodd


__________________
This message was archived from an earlier forum system. Some information may have been left out. Start new discussion in the current forums, and refer back to these threads when necessary.
 


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 Off
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
FYI: FIRST Robots at the NYC Hall of Science Rich Wong General Forum 9 11-07-2002 10:52
Curie Division Robots information... (not complete) archiver 2001 3 24-06-2002 03:13
how effective do you think robots going under the bar archiver 2001 4 24-06-2002 00:36
Sound Levels Measured at the Nationals archiver 1999 8 23-06-2002 22:47
Avg Score CMC General Forum 14 12-03-2002 07:23


All times are GMT -5. The time now is 02:47.

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