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R.C. 03-07-2011 21:14

Re: pic: Pigmice Northwest Drive
 
Quote:

Originally Posted by Colin P (Post 1067672)
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

Jeffy 04-07-2011 13:54

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.

AdamHeard 04-07-2011 14:45

Re: pic: Pigmice Northwest Drive
 
Quote:

Originally Posted by Jeffy (Post 1067807)
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.

AdamHeard 04-07-2011 14:53

Re: pic: Pigmice Northwest Drive
 
Quote:

Originally Posted by Molten (Post 1067669)
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

NickE 04-07-2011 15:01

Re: pic: Pigmice Northwest Drive
 
Quote:

Originally Posted by AdamHeard (Post 1067813)
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.

AdamHeard 04-07-2011 15:17

Re: pic: Pigmice Northwest Drive
 
Quote:

Originally Posted by NickE (Post 1067817)
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.

Brandon Holley 05-07-2011 09:08

Re: pic: Pigmice Northwest Drive
 
Quote:

Originally Posted by AdamHeard (Post 1067813)
I know our driver stayed in our 17fps high gear 90% of the match, if not more.

Free speed? Or under theoretical load?

-Brando


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