Go to Post I believe that "going home a winner" is more a matter of perception than anything else. - JesseK [more]
Home
Go Back   Chief Delphi > Other > FIRST Tech Challenge
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
 
 
Thread Tools Rating: Thread Rating: 4 votes, 5.00 average. Display Modes
Prev Previous Post   Next Post Next
  #27   Spotlight this post!  
Unread 14-09-2009, 00:21
Rick TYler Rick TYler is offline
A VEX GUy WIth A STicky SHift KEy
VRC #0010 (Exothermic Robotics)
Team Role: Mentor
 
Join Date: Jan 2005
Rookie Year: 2005
Location: Redmond, Washington
Posts: 2,000
Rick TYler has a reputation beyond reputeRick TYler has a reputation beyond reputeRick TYler has a reputation beyond reputeRick TYler has a reputation beyond reputeRick TYler has a reputation beyond reputeRick TYler has a reputation beyond reputeRick TYler has a reputation beyond reputeRick TYler has a reputation beyond reputeRick TYler has a reputation beyond reputeRick TYler has a reputation beyond reputeRick TYler has a reputation beyond repute
Re: [FTC]: FTC Game Announced

Quote:
Originally Posted by Chris is me View Post
Those chains and sprockets look much more able to withstand the forces of a drivetrain than the Vex kit, which screwed me over during my hasty rebuild in 2008
You are right, #25 steel chain is going to be stronger than a little plastic chain. It's also going to be greasier, heavier, more expense, take up more room, and be harder to install and size. The right part for the right job. I suspect the decision to use standard #25 chain (if that is what it is) has a lot more to do with finding an off-the-shelf part that doesn't require engineering, test and manufacturing than it does with providing the perfect technical solution for our robots. The advantage is lower cost than if they had custom-made a metal chain.

VRC 418 had the little VEX chains in its drivetrain and went through two tournaments and the World Championships without a single failure. They were finalists in the Technology Division.

VRC 417 had the little VEX chains in its drivetrain and went through two tournaments and the World Championships without a single failure.

VRC 575 had the little VEX chains in its drivetrain and went through three tournaments and the World Championships without a single failure. They won the Think Award, came in second place in the World Championships Programming Skills Challenge, and had the highest recorded competition score of the year in PSC. You can see a pretty good picture of the drivetrain here: http://www.vexforum.com/gallery/show...rchid= 347651.

Given the yards of #35 chain I've seen on the floor of FRC fields over the years, I'd conclude that it is entirely unsuited to drivetrains, too.

It's not the chains, it's how they are used. They are poorly suited for a heavy-lift application, but we've had terrific luck with them in drivetrains, and for "medium lift." In 2007 we used them to drive the lifting mechanism for the softballs, and they never failed (frankly, I was surprised).

As you mentioned in your post -- testing is good.
__________________
Exothermic Robotics Club, Venturing Crew 2036
VRC 10A, 10B, 10D, 10Q, 10V, 10X, 10Z, and 575

Last edited by Rick TYler : 14-09-2009 at 00:27.
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

Similar Threads
Thread Thread Starter Forum Replies Last Post
[FTC]: 2009/2010 FTC game design dooey100 FIRST Tech Challenge 54 27-07-2009 04:55
[FTC]: FTC Game Platform for 2009-2010 Rick TYler FIRST Tech Challenge 30 27-04-2009 20:17
[FTC]: Thoughts on new FTC game? Troubled FIRST Tech Challenge 45 07-12-2008 21:00
[FTC]: 2007 FTC Game Hint Released skimoose FIRST Tech Challenge 37 23-10-2007 00:01
FTC Game Hint Announced Brandon Martus Announcements 0 12-09-2007 10:04


All times are GMT -5. The time now is 08:26.

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