View Single Post
  #6   Spotlight this post!  
Unread 12-01-2014, 00:05
cadandcookies's Avatar
cadandcookies cadandcookies is offline
Director of Programs, GOFIRST
AKA: Nick Aarestad
FTC #9205 (The Iron Maidens)
Team Role: College Student
 
Join Date: Jan 2012
Rookie Year: 2009
Location: Minnesnowta
Posts: 1,563
cadandcookies has a reputation beyond reputecadandcookies has a reputation beyond reputecadandcookies has a reputation beyond reputecadandcookies has a reputation beyond reputecadandcookies has a reputation beyond reputecadandcookies has a reputation beyond reputecadandcookies has a reputation beyond reputecadandcookies has a reputation beyond reputecadandcookies has a reputation beyond reputecadandcookies has a reputation beyond reputecadandcookies has a reputation beyond repute
Re: [FTC]: Can I add non-slip material to 4" Tetrix Wheels?

Quote:
Originally Posted by F Elliott View Post
We qualified for our regionals! We are in shock.

We definitely need to improve our drive system. We are too slow and we have unpredictable traction around and on the Ramp. Should we go for driving all four wheels? Do we need to go for four motors or is two motors on a chain/gear drive enough?

How do you analyze this sort of question?
In my experience working with the ten Eagan Robotics FTC teams this year, either of the setups you mentioned would be just fine, especially considering your main problem is "unpredictable traction"-- the main solution for which is making sure your wheels have the same or similar traction and are getting the same or similar power from your motors.

If I were you, I would ask the question of which fits into your existing robot with the least amount of work.

That being said, under nearly any normal circumstances, a 4-motor drive will beat out a 2-motor drive in terms of pushing power. If your only goal is behaving predictably around the ramp and you have a better use for two DC motors, by all means a 2-motor chain drive should behave just fine.

Unfortunately I'm not at our workspace right now, but I'd be happy to get you pictures of our various drive setups if you'd like.

On another note, good job qualifying for (I presume) your super-regional tournament, and good luck when you get there!

EDIT: You can also check out some of the pictures in the FTC link in my signature for photos, but most of them don't focus on the drive trains.
__________________

Never assume the motives of others are, to them, less noble than yours are to you. - John Perry Barlow
tumblr | twitter
'Snow Problem CAD Files: 2015 2016
MN FTC Field Manager, FTA, CSA, Emcee
FLL Maybe NXT Year (09-10) -> FRC 2220 (11-14) -> FTC 9205(14-?)/FRC 2667 (15-16)
VEXU UMN (2015-??)
Volunteer since 2011
2013 RCA Winner (North Star Regional) (2220)
2016 Connect Award Winner (North Super Regional and World Championship) (9205)

Last edited by cadandcookies : 12-01-2014 at 00:08.
Reply With Quote