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-   -   Drive Systems (http://www.chiefdelphi.com/forums/showthread.php?t=99373)

cricket66 07-01-2012 20:54
Re: Drive Systems
 
What is the bumper height restriction this year. I see nothing in the specs.

tlivingd 07-01-2012 21:03
Re: Drive Systems
 
Quote:
Originally Posted by cricket66 (Post 1098603)
What is the bumper height restriction this year. I see nothing in the specs.
R01, blue box


[R01] see the whole rule as trimmed for content......... The Frame Perimeter of a Robot is defined by the outer-most set of exterior verticies on the Robot that are within the Bumper Zone, which is between 2 and 10 in. from the floor. Minor protrusions no greater than ¼ in. such as bolt heads, fastener ends, and rivets are not considered part of the Frame Perimeter.

To determine the Frame Perimeter, wrap a piece of string around the Robot at the level described in [R02]. The string describes this polygon.

Note: to permit a simplified definition of the Frame Perimeter and encourage a tight, robust connection between the Bumpers and the Frame Perimeter, minor protrusions such as bolt heads, fastener ends, rivets, etc are excluded from the determination of the Frame Perimeter.


Why this isn't in the bumper section i'll never know.

EDIT: Howdy neighbor! :-)

tlivingd 07-01-2012 21:06
Re: Drive Systems
 
Quote:
Originally Posted by Daniel_LaFleur (Post 1098601)
Depends on how high you lift the chassis.

Also, you'd need to be careful of 'articulating' bumpers.
Please see:
[R30]
Bumpers may not be articulated.

Daniel_LaFleur 07-01-2012 21:07
Re: Drive Systems
 
Quote:
Originally Posted by tlivingd (Post 1098626)
Please see:
[R30]
Bumpers may not be articulated.
Exactly why I mentioned it ;)

Grim Tuesday 07-01-2012 21:43
Re: Drive Systems
 
May our 14" mechanism expand in the bumper zone outside the robot?

Steven Donow 07-01-2012 21:50
Re: Drive Systems
 
Quote:
Originally Posted by Grim Tuesday (Post 1098706)
May our 14" mechanism expand in the bumper zone outside the robot?
I would assume so. My POV regarding this is that the bumper zone is only a bumper zone when there are bumpers present. That sounds a bit confusing, but what I'm saying is, you have your bumpers set with the openings, then you have an arm(or whatever) at the same level as your bumpers, then yes, its seems like you can expand there(if that's what you're asking)

joek 07-01-2012 21:50
Re: Drive Systems
 
Quote:
Originally Posted by Ninja_Bait (Post 1098552)
Our team is also coming up with ways to jump the bump, but I'm actually surprised that people think mecanum will be used by a lot of teams. HDPE floors? Bumps? Bridges? Those will not be nice to your poor Swiss wheels.
their actually one of, if not the strongest wheels out there (an aluminum and steel sandwich). that said, you probably should use hard rubber rollers, as the soft one might get chewed up. also, u will want 10", because the boards are 4" high...

Quote:
Originally Posted by Daniel_LaFleur (Post 1098629)
Exactly why I mentioned it ;)
they never said that the part their attached to can't move...

pfreivald 07-01-2012 21:50
Re: Drive Systems
 
Quote:
Originally Posted by Gdeaver (Post 1098586)
Wouldn't lifting the robot violate the bumper height rule?
I don't think so -- any more than driving across a tilted ramp would violate the bumper height rule. The bumper height is clearly relative to the robot, and not to the absolute plane of the court floor, else any ramp action is inherently illegal.

Andrew Zeller 07-01-2012 23:06
Re: Drive Systems
 
Quote:
Originally Posted by Zoughtbaj (Post 1098237)
I'm curious if anyone is going to try to build a drive train to actually circumvent the barrier. The only things I can think of to do that would be either rather large wheels or a tread drive (after actually seeing the barrier, normal wheels will likely be an "improbability" :)). Then again, the rules are strict enough in regard to passing over the balance boards (G25, G28, G29) that I doubt there will be a need to go over the barrier. Our team has been developing a 6-wheel drive system that we are pretty happy with, because of the increased mobility over the 4-wheel. However, 4-wheel drives will have a fine time navigating the field as well, I think.
hmmm.... http://www.youtube.com/watch?v=5MgdG...eature=related

Grim Tuesday 07-01-2012 23:15
Re: Drive Systems
 
Team 610 in 2010 had ~10" pneumatic wheeled 6WD; the middle one rose and lowered so that they had an easier time with the bump. I'll try to find a video, but most of them are low res taken from far away. Anyone have a picture of it? Still my favorite robot of all time.

Starke 07-01-2012 23:19
Re: Drive Systems
 
Quote:
Originally Posted by Grim Tuesday (Post 1098881)
Team 610 in 2010 had ~10" pneumatic wheeled 6WD; the middle one rose and lowered so that they had an easier time with the bump. I'll try to find a video, but most of them are low res taken from far away. Anyone have a picture of it? Still my favorite robot of all time.
Done.


http://frc-designs.com/html/CAD_2010.html

Flimsor 08-01-2012 01:46
Re: Drive Systems
 
This was posted in a different forum. It's a really cool way to drive the robot, but i'm not completely sure how effective it would be for this years game.

http://youtu.be/uaT7M3Nwj7c


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