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-   -   The holes in the bridge are for? (http://www.chiefdelphi.com/forums/showthread.php?t=99931)

JohnA888 12-01-2012 14:54
The holes in the bridge are for?
 
"The top surface of each bridge includes and array of 15 small holes, details of which are included in the official field drawings." I have seen the drawings and was wondering what the purpose of the holes were. Anyone have any ideas?

Shu2137 12-01-2012 15:02
Re: The holes in the bridge are for?
 
They are there to hold the balls from rolling around pre-match. Not saying they could not be used for anything else...

Hallry 12-01-2012 15:19
Re: The holes in the bridge are for?
 
Quote:
Originally Posted by Shu2137 (Post 1103586)
They are there to hold the balls from rolling around pre-match. Not saying they could not be used for anything else...
Well, that makes sense. And a maximum of 14 balls can be held on the Coopertition ramp, so the 15 fits there.

PiManIII 12-01-2012 16:41
Re: The holes in the bridge are for?
 
Where can I find these dimensions? I tried looking in the manual, but there are no specific dimensions. Any thoughts?

vhcook 12-01-2012 16:45
Re: The holes in the bridge are for?
 
Quote:
Originally Posted by PiManIII (Post 1103666)
Where can I find these dimensions? I tried looking in the manual, but there are no specific dimensions. Any thoughts?
You need to look at the field drawings for specific dimensions.

PiManIII 12-01-2012 16:49
Re: The holes in the bridge are for?
 
After looking through all of that material, I still could not locate the size of the holes and the proper spacing. I'm assuming that the holes are predrilled when given to fields, but how can we replicate this with our version (plywood)?

D.Allred 12-01-2012 16:57
Re: The holes in the bridge are for?
 
Quote:
Originally Posted by PiManIII (Post 1103677)
After looking through all of that material, I still could not locate the size of the holes and the proper spacing. I'm assuming that the holes are predrilled when given to fields, but how can we replicate this with our version (plywood)?
Game Specific Drawings - Sheet number GE 12095 - page 106 in the pdf file.

SteveJanesch 12-01-2012 17:05
Re: The holes in the bridge are for?
 
The holes are 1-1/8" diameter, and will wind up being 1/8" deep. At that depth, it's probably just to steady the balls at the beginning of the match.

- Steve

Elgin Clock 13-01-2012 02:01
Re: The holes in the bridge are for?
 
I didn't even think it would be for steadying the balls at the beginning of the match. The manual *I believe* is very vague as to the position of the placement of the balls, but this COULD be a possibility. Random placements at the beginning of the match (ala 2005 tetra placements at the start of a match) maybe?

Aside from that discussion, my first thought for the purpose behind the holes (which I'm surprised no one brought up yet) would be a deterrent to add a vacuum suction cup to the bottom of your robot to hold yourself in place.

This was assumed by myself & some of my other veteran team members from experiencing first hand teams doing this in the past for games (2006 actually comes to mind - or any other year with a surface similar to the plastic(ish) top of this year's ramps.

Do the "holes" actually go all the way go through the top most ramp material to let air/other things fall through, or are they just countersinks?

Aren Siekmeier 13-01-2012 02:16
Re: The holes in the bridge are for?
 
The field drawings show them as thru holes in the top layer of polycarbonate.

Elgin Clock 13-01-2012 02:26
Re: The holes in the bridge are for?
 
Quote:
Originally Posted by compwiztobe (Post 1104220)
The field drawings show them as thru holes in the top layer of polycarbonate.
Well then... My first impression is the one I'm sticking with. A deterrent for attaching yourself to the ramp permanently at any time during the match with a suction cup of any kind.

Aren Siekmeier 13-01-2012 02:42
Re: The holes in the bridge are for?
 
Quote:
Originally Posted by Elgin Clock (Post 1104223)
Well then... My first impression is the one I'm sticking with. A deterrent for attaching yourself to the ramp permanently at any time during the match with a suction cup of any kind.
There is already <G10> making attaching to field structures illegal, so this might already be covered. Besides, what advantage would anchoring yourself with a sunction cup present? You are now unable to adjust your wait to facilitate balancing, and you got up there in the first place so tipping is hopefully not a concern.

It seems very likely to me that the holes are for the balls.

WizenedEE 13-01-2012 02:46
Re: The holes in the bridge are for?
 
Quote:
Originally Posted by compwiztobe (Post 1104231)
There is already <G10> making attaching to field structures illegal, so this might already be covered. Besides, what advantage would anchoring yourself with a sunction cup present? You are now unable to adjust your wait to facilitate balancing, and you got up there in the first place so tipping is hopefully not a concern.

It seems very likely to me that the holes are for the balls.
I think it would help because presumably the best strategy to balance 2 robots is to get one in about the right position and move the other one around. The suction cup would mean the one staying still wouldn't slide. It would also be helpful if you had a movable mass on your robot.

Gary Bonner 13-01-2012 13:11
Re: The holes in the bridge are for?
 
The holes are for ball placement.
Quote:
Q. Re: [G05] Where specifically are the Basketballs placed on each bridge? Is each alliance allowed to select the position of the 2 balls on their own alliance bridge? Where are unused Basketballs allotted to Robots placed on the Coopertition Bridge? Where are the 2 “regular” Coopertition Bridge
A. Balls will be placed in any of the 15 holes in the surface of the Bridge. Exact locations are not specifically defined and will be determined by the field reset crew at the event.
Suction cups are not legal.
Quote:
Q. If a robot attaches suction cups to the bridge, is that considered grappling a field element?
A. This would be a violation of Rule [G10].

JesseK 13-01-2012 13:18
Re: The holes in the bridge are for?
 
Quote:
Originally Posted by compwiztobe (Post 1104231)
There is already <G10> making attaching to field structures illegal, so this might already be covered. Besides, what advantage would anchoring yourself with a sunction cup present? You are now unable to adjust your wait to facilitate balancing, and you got up there in the first place so tipping is hopefully not a concern.

It seems very likely to me that the holes are for the balls.
Oh ye of little imagination...

With 3 robots on the bridge, no robot can move in order to balance. Thus the only way to account for differences in weight & c.g. would be to have an arm or slide that can transfer a little bit of weight from one side to the other. It's also much more precise than driving.

Don't think robots will have arms this year? I suspect many teams will have bridge lowering mechanisms powered by motors.

"Quick! Everyone lean left!" :ahh:


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