Go to Post Enlighten a man who sometimes has difficulty understanding why others stray outside the box, when the box appears to be an optimized and elegant solution. - JVN [more]
Home
Go Back   Chief Delphi > ChiefDelphi.com Website > Extra Discussion
CD-Media   CD-Spy  
portal register members calendar search Today's Posts Mark Forums Read FAQ rules

 
Reply
Thread Tools Rate Thread Display Modes
  #16   Spotlight this post!  
Unread 03-07-2011, 21:14
R.C.'s Avatar
R.C. R.C. is online now
2017... Oooh Kill em, Swerve!
AKA: Owner, WestCoast Products
FRC #1323 (MadTown Robotics)
Team Role: Engineer
 
Join Date: Feb 2008
Rookie Year: 2006
Location: Madera, CA
Posts: 2,184
R.C. has a reputation beyond reputeR.C. has a reputation beyond reputeR.C. has a reputation beyond reputeR.C. has a reputation beyond reputeR.C. has a reputation beyond reputeR.C. has a reputation beyond reputeR.C. has a reputation beyond reputeR.C. has a reputation beyond reputeR.C. has a reputation beyond reputeR.C. has a reputation beyond reputeR.C. has a reputation beyond repute
Re: pic: Pigmice Northwest Drive

Quote:
Originally Posted by Colin P View Post
I've been thinking of a similar design, but I was planning on using 4 plaction wheels in the center with the 4 omnis in the corners. I believed this would help increase stability from being spun by other robots.
8 wheel - 4 plaction center, 4 omni corners for stability and forward pushing. No drop.

Anybody think the 4 wheel center would actually do anything to fight being spun from other robots pushing your corners?
Highly doubt it. You'll still get spun easily. If you want traction and maneuverabilit take a look at 148/217 2010 setup.

-RC
__________________
R.C.
Owner, WestCoast Products || Twitter
MadTown Robotics Team 1323
Reply With Quote
  #17   Spotlight this post!  
Unread 04-07-2011, 13:54
Jeffy's Avatar
Jeffy Jeffy is offline
Retired, for now
AKA: Jeff Gier
FRC #2410 (Metal Mustang Robotics) #159 (Alpine Robotics)
Team Role: College Student
 
Join Date: Mar 2008
Rookie Year: 2008
Location: Fort Collins
Posts: 523
Jeffy has a brilliant futureJeffy has a brilliant futureJeffy has a brilliant futureJeffy has a brilliant futureJeffy has a brilliant futureJeffy has a brilliant futureJeffy has a brilliant futureJeffy has a brilliant futureJeffy has a brilliant futureJeffy has a brilliant futureJeffy has a brilliant future
Re: pic: Pigmice Northwest Drive

Many times it has been said that you shouldn't bother shifting if you are gonna have omni wheels. It's fairly accurate. You can do the math if you like, but it will be easier to spin the wheels and you won't win many pushing contests.

One other note: Low gear is defintely too slow. This past year we ran a similar speed w/ 13fps and 3.5fps. In low gear we could push without issues, but it took a very long time to get anywhere. It really wasn't worth it. Try gearing your low gear closer to the traction break point. Which will probably comeout to be 7-8fps.
__________________
Metal Mustang Robotics 2410 (2008-2011)
2008 STL Rookie All-Star
2010 GKC Finalists
2010 OKC Champions
Alpine Robotics 159 (2012-)
2012 CO Finalists

700 miles from home, 2 miles from FRC. Life is good.
Reply With Quote
  #18   Spotlight this post!  
Unread 04-07-2011, 14:45
AdamHeard's Avatar
AdamHeard AdamHeard is offline
Lead Mentor
FRC #0973 (Greybots)
Team Role: Mentor
 
Join Date: Oct 2004
Rookie Year: 2004
Location: Atascadero
Posts: 5,508
AdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond repute
Send a message via AIM to AdamHeard
Re: pic: Pigmice Northwest Drive

Quote:
Originally Posted by Jeffy View Post
Many times it has been said that you shouldn't bother shifting if you are gonna have omni wheels. It's fairly accurate. You can do the math if you like, but it will be easier to spin the wheels and you won't win many pushing contests.

One other note: Low gear is defintely too slow. This past year we ran a similar speed w/ 13fps and 3.5fps. In low gear we could push without issues, but it took a very long time to get anywhere. It really wasn't worth it. Try gearing your low gear closer to the traction break point. Which will probably comeout to be 7-8fps.
When you're driving around trying to get to places, shouldn't you always be in high gear?

I know our driver stayed in our 17fps high gear 90% of the match, if not more.
Reply With Quote
  #19   Spotlight this post!  
Unread 04-07-2011, 14:53
AdamHeard's Avatar
AdamHeard AdamHeard is offline
Lead Mentor
FRC #0973 (Greybots)
Team Role: Mentor
 
Join Date: Oct 2004
Rookie Year: 2004
Location: Atascadero
Posts: 5,508
AdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond repute
Send a message via AIM to AdamHeard
Re: pic: Pigmice Northwest Drive

Quote:
Originally Posted by Molten View Post
Thanks for the responses. I knew there was a good reason just couldn't figure it out. I still have my reservations about such small wheels, but that is probably just because they are new to me.

Jason
This post I made in another thread (and some other posts from others in that thread) describe more benefits of small wheels.


http://www.chiefdelphi.com/forums/sh...6&postcount=74
Reply With Quote
  #20   Spotlight this post!  
Unread 04-07-2011, 15:01
NickE's Avatar
NickE NickE is offline
_
FRC #0254 (The Cheesy Poofs)
Team Role: Engineer
 
Join Date: Mar 2008
Rookie Year: 2008
Location: San Jose, CA
Posts: 620
NickE has a reputation beyond reputeNickE has a reputation beyond reputeNickE has a reputation beyond reputeNickE has a reputation beyond reputeNickE has a reputation beyond reputeNickE has a reputation beyond reputeNickE has a reputation beyond reputeNickE has a reputation beyond reputeNickE has a reputation beyond reputeNickE has a reputation beyond reputeNickE has a reputation beyond repute
Re: pic: Pigmice Northwest Drive

Quote:
Originally Posted by AdamHeard View Post
When you're driving around trying to get to places, shouldn't you always be in high gear?

I know our driver stayed in our 17fps high gear 90% of the match, if not more.
Agreed. I could probably count the number of times we used low gear in 2011 on one hand. Low gear is one of those things that is rarely needed in everyday match play. However, when we need it, we really need it. You can probably make low gear faster than 3.6 ft/sec, just make sure it's traction limited.

Last edited by NickE : 04-07-2011 at 15:06.
Reply With Quote
  #21   Spotlight this post!  
Unread 04-07-2011, 15:17
AdamHeard's Avatar
AdamHeard AdamHeard is offline
Lead Mentor
FRC #0973 (Greybots)
Team Role: Mentor
 
Join Date: Oct 2004
Rookie Year: 2004
Location: Atascadero
Posts: 5,508
AdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond reputeAdamHeard has a reputation beyond repute
Send a message via AIM to AdamHeard
Re: pic: Pigmice Northwest Drive

Quote:
Originally Posted by NickE View Post
Agreed. I could probably count the number of times we used low gear in 2011 on one hand. Low gear is one of those things that is rarely needed in everyday match play. However, when we need it, we really need it. You can probably make low gear faster than 3.6 ft/sec, just make sure it's traction limited.
The issue here is he's stuck with the AM stock gearing. So he can't independantly vary the speeds.

However, I do feel 13.5s is a bit slow for most games, 15-16 is much nicer.
Reply With Quote
  #22   Spotlight this post!  
Unread 05-07-2011, 09:08
Brandon Holley's Avatar
Brandon Holley Brandon Holley is offline
Chase perfection. Catch excellence.
AKA: Let's bring CD back to the way it used to be
FRC #0125 (NU-TRONs, Team #11 Alumni (GO MORT))
Team Role: Engineer
 
Join Date: Jan 2004
Rookie Year: 2001
Location: Boston, MA
Posts: 2,593
Brandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond reputeBrandon Holley has a reputation beyond repute
Send a message via AIM to Brandon Holley
Re: pic: Pigmice Northwest Drive

Quote:
Originally Posted by AdamHeard View Post
I know our driver stayed in our 17fps high gear 90% of the match, if not more.
Free speed? Or under theoretical load?

-Brando
__________________
MORT (Team 11) '01-'05 :
-2005 New Jersey Regional Chairman's Award Winners
-2013 MORT Hall of Fame Inductee

NUTRONs (Team 125) '05-???
2007 Boston Regional Winners
2008 & 2009 Boston Regional Driving Tomorrow's Technology Award
2010 Boston Regional Creativity Award
2011 Bayou Regional Finalists, Innovation in Control Award, Boston Regional Finalists, Industrial Design Award
2012 New York City Regional Winners, Boston Regional Finalists, IRI Mentor of the Year
2013 Orlando Regional Finalists, Industrial Design Award, Boston Regional Winners, Pine Tree Regional Finalists
2014 Rhode Island District Winners, Excellence in Engineering Award, Northeastern University District Winners, Industrial Design Award, Pine Tree District Chairman's Award, Pine Tree District Winners
2015 South Florida Regional Chairman's Award, NU District Winners, NEDCMP Industrial Design Award, Hopper Division Finalists, Hopper/Newton Gracious Professionalism Award
Reply With Quote
Reply


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 06:57.

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