View Single Post
  #8   Spotlight this post!  
Unread 05-02-2009, 15:23
dtengineering's Avatar
dtengineering dtengineering is offline
Teaching Teachers to Teach Tech
AKA: Jason Brett
no team (British Columbia FRC teams)
Team Role: Mentor
 
Join Date: Jan 2005
Rookie Year: 2004
Location: Vancouver, BC
Posts: 1,827
dtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond reputedtengineering has a reputation beyond repute
Re: pic: 1346 Side View 2009

Quote:
Originally Posted by russoch518 View Post
Question for team 1346. Does your team feel that a six wheel robot will be better then at four wheel one for the game we will be playing? Also tell could you tell me why you guys came up with six wheels other then four.
Also could you tell us how well the robot turns.
Team 3044
We'll hopefully be able to answer the question about how well it turns before we ship it out, however the final determination of that will likely be based upon how well we can master traction control. Thanks to the modular design of the robot we can unbolt one of the drive modules and the control module and keep them back as part of our 40 pounds of robot that we don't have to ship, and attempt to optimize traction control in the time between ship date and the Seattle regional. It may even be possible to keep both of the drive modules if we unbolt the CIMs and ship the CIMs, then just use a couple of spare CIMs for testing purposes. That depends on final weights and how much assembly we want to do on Thursday in Seattle.

As for the "why" part of the question, however, I will reference this thread http://www.chiefdelphi.com/forums/sh...ad.php?t=71238 and the white paper/spreadsheet referenced in it.

This robot is, actually, a four wheel drive robot... as most 6wd designs actually are. In our case the front two wheels are 1/8" off the ground. This means that the wheel base is effectively the distance between the two rear axles, or about 13". By reducing the wheel base, and maximizing the width between the wheels we are maximizing our turning torque by reducing the amount of scrubbing that will occurr during turns.

The two front wheels are there just to keep us from tipping forward and to help us get back up on the regolith from the carpet... if we run in to weight issues, we could probably get rid of the drive chain leading to them and, even, the front wheels themselves.

Jason
Reply With Quote