<R11> Dimension wrong?

[Trent B]

Originally Posted by Richard

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]

Originally Posted by Trent B

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]

Under R11, playing configuration, the max horizontal dimensions are stated as:

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]

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]

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.]

Originally Posted by Al Skierkiewicz

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.]

Threads merged.

[DonRotolo]

What is wrong with me?

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]

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]

...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]

Originally Posted by Paul Copioli

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]

Originally Posted by Elgin Clock

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]

Originally Posted by Chris is me

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]

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!

[Trent B]

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)