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-   -   <R11> Dimension wrong? (http://www.chiefdelphi.com/forums/showthread.php?t=88589)

Trent B 09-01-2011 14:09
Re: 60" Rule (Rule <R11>)
 
Quote:
Originally Posted by Richard (Post 994505)
At ~9:43 in the Game Demo Video the example robot appears to exceed a 60" cylinder while deploying a mini-bot. Its ~15" wide sliding stage extends about 17" beyond its front bumper.

Then again, examples used in a demonstration might not adhere to all rules. The GDC will need to clarify the rule. Thanks, Paul, for catching the inconsistency between the stated inch and metric dimensions of the playing configuration limit.
By my calculations of segments of circles in order for a 15" wide thing to fit in a 60" diameter circle it would have to be 1" from tangent with the circle, for a 28" wide robot the rear would have to be 3.5" from tangent with the circle thus the robot length would have to be overall about 55.5" long (60-1-3.5) 38+17 is 55" so it could be just inside the 60" diameter cylinder.

Richard Wallace 09-01-2011 14:14
Re: 60" Rule (Rule <R11>)
 
Quote:
Originally Posted by Trent B (Post 994514)
By my calculations of segments of circles in order for a 15" wide thing to fit in a 60" diameter circle it would have to be 1" from tangent with the circle, for a 28" wide robot the rear would have to be 3.5" from tangent with the circle thus the robot length would have to be overall about 55.5" long (60-1-3.5) 38+17 is 55" so it could be just inside the 60" diameter cylinder.
My guesstimate of the slide extension was 17" beyond the front bumper, so your 55" would become ~57". So I think the example robot was just outside a 60" diameter cylinder. Either way, it's close.

JohnHorton 09-01-2011 19:35
<R11> Dimension wrong?
 
Under R11, playing configuration, the max horizontal dimensions are stated as:

Quote:
60" (213.4cm) diameter vertical right cylindrical volume
(emphasis mine)

60" (and the correct metric conversion) is listed as the starting size. 213.4 cm is just about 84", so I wonder if the metric is correct, as that would sound reasonable. Otherwise, the bots will look like T. Rexes, huge bodies yet tiny arms.

Karibou 09-01-2011 19:37
Re: <R11> Dimension wrong?
 
There's already another thread discussing this:

http://www.chiefdelphi.com/forums/sh...357#post994357

It's something that will have to be asked to the Q&A.

Al Skierkiewicz 09-01-2011 20:06
Re: <R11> Dimension wrong?
 
There is a revised Robot rules on the First website
04- The Robot Rev-.pdf. the dimension gives 152.4 cm as the max dimension.

Ricky Q. 09-01-2011 20:13
Re: <R11> Dimension wrong?
 
Quote:
Originally Posted by Al Skierkiewicz (Post 994975)
There is a revised Robot rules on the First website
04- The Robot Rev-.pdf. the dimension gives 152.4 cm as the max dimension.
I see 152.4 cm for max Starting Height but still see the discrepancy in Playing Config dimensions.

RQ

Ricky Q. 09-01-2011 20:15
Re: <R11> Dimension wrong?
 
Threads merged.

DonRotolo 09-01-2011 22:28
Re: <R11> Dimension wrong?
 
What is wrong with me?:confused:

38 inch robot plus 22 inch extension fits in a 60 inch cylinder. 22 inches seems like enough to get halfway across a 30 inch base.

Surely I am missing something here.

Paul Copioli 09-01-2011 22:37
Re: <R11> Dimension wrong?
 
Don,

Your analysis is correct if your robot is <<1in wide otherwise:

Draw a 30 x 38 rectangle. Then draw a 60" diameter circle. Make two points of the robot coincident to the circle ... observe. Believe me, it is brutal.

Also remember that due to the bumper rule this year, any mechanism that tried to go all the way to the floor will have to do it around the bumper. You just lost another 3 inches.

Paul

pfreivald 09-01-2011 22:42
Re: <R11> Dimension wrong?
 
...so maybe our minibots have to be deployed onto the base, find and attach to the tower themselves, and then climb/jump/shimmy...?

Yeah, this one looks a doozy!

Elgin Clock 09-01-2011 22:44
Re: <R11> Dimension wrong?
 
Quote:
Originally Posted by Paul Copioli (Post 995224)
Don,

Your analysis is correct if your robot is <<1in wide otherwise:

Draw a 30 x 38 rectangle. Then draw a 60" diameter circle. Make two points of the robot coincident to the circle ... observe. Believe me, it is brutal.
You mean like this??


Generously drawn up & provided by Arthur Dutra IV from FRC 228.
So... what's the issue?

Chris is me 09-01-2011 22:46
Re: <R11> Dimension wrong?
 
Quote:
Originally Posted by Elgin Clock (Post 995239)
So... what's the issue?
The space in front of the robot is barely enough for an end effector... if you're building in Inches. :)

Karibou 09-01-2011 22:49
Re: <R11> Dimension wrong?
 
Quote:
Originally Posted by Chris is me (Post 995242)
The space in front of the robot is barely enough for an end effector... if you're building in Inches. :)
Maybe FIRST is trying to tell us that metric is the way to go. Really, I can't blame them...

Elgin Clock 09-01-2011 22:59
Re: <R11> Dimension wrong?
 
For reference in addition to the pic up above, it is 18.53" from the front of the bot to the edge of the circle in front of the bot (centrally located to the tangency of course).
Yay design constraints. Gotta love them! ::safety::

Trent B 09-01-2011 23:20
Re: <R11> Dimension wrong?
 
And that edge of the circle being 18.53 away is if your manipulator is ~≤1inch wide

Some figures
Width of manipulator measured parallel to the 28" edge of the robot and parallel to the ground

1" manipulator cut off .004"
2" cut of .017"
4" cut off .0667"
6" cut off .15"
8" cut off .268"
10" cut off .42"
12" cut off .606"

...

28" cut off 3.467 (the figure for the standard 28 x 38 bot)


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