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Unread 04-01-2009, 08:26
Rich Kressly's Avatar
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Re: robot design question

I see one problem with this design concept with the way I am reading R11.
The width is defined as a max of 28 at the start and during the match. The way I am reading this rule, you can't construct a 'wide-body' robot. Does anyone else see this the same way I do?

"<R11>At the start of, and during, the MATCH the ROBOT shall fit within the dimensions listed below:
Width Maximum 28 inches (71.12cm)
Depth Maximum 38 inches (96.52cm)
Height Maximum 60 inches (152.40cm)
Weight Maximum 120 pounds (54.43Kg)"
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Unread 04-01-2009, 08:32
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Re: robot design question

Is width and depth defined in any particular direction relative to the robot travel?

Rule <R80> defines width and depth in the opposite directions for the driver station, 60" wide by 12" deep.
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Unread 04-01-2009, 08:43
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Re: robot design question

Quote:
Originally Posted by GaryVoshol View Post
Is width and depth defined in any particular direction relative to the robot travel?

Rule <R80> defines width and depth in the opposite directions for the driver station, 60" wide by 12" deep.
That's the magic question in my book...
I was comparing to the language from the 2008 manual, where R11 reads:
"Prior to the beginning of the MATCH, the ROBOT shall be placed in a STARTING CONFIGURATION that fits within the dimensions listed below: (with the exact same chart as this year)"

It seems to me the language in that opening sentence this year may be more restrictive to what length and depth are, not just restricting the overall size of the robot during the match. Perhaps it's a good question for Q&A.
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Unread 04-01-2009, 10:28
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Re: robot design question

Quote:
Originally Posted by GaryVoshol View Post
Is width and depth defined in any particular direction relative to the robot travel?
I haven't seen anything that prevents your robot from having "sideways" wheels so that it travels "left" and "right" instead of "forward" and "backward", and the trailer hitch isn't required to be mounted on the "back" of the robot.

So even if the front of the robot is defined as the narrow side, the rules don't seem to make you put that front facing away from the trailer.
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Unread 04-01-2009, 11:06
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Re: robot design question

Quote:
Originally Posted by Alan Anderson View Post
I haven't seen anything that prevents your robot from having "sideways" wheels so that it travels "left" and "right" instead of "forward" and "backward", and the trailer hitch isn't required to be mounted on the "back" of the robot.

So even if the front of the robot is defined as the narrow side, the rules don't seem to make you put that front facing away from the trailer.
I'm inclined to start leaning your way Alan. Mind you the ONLY info I have right now is from the 2008 Q&A, but last year's manual had the same sizing chart and the wide body orientation was allowed in the Q&A in 2008. Should prob still be asked this year, but carry on with the wide design ideas....
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Unread 04-01-2009, 11:11
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Re: robot design question

Quote:
Originally Posted by GaryVoshol View Post
Are those short segments adjacent to the trailer proper 6" minimum lengths? (You count the plywood, not the foam.)
Out of curiosity, why do you think that the 6" length must be entirely backed by plywood?

I don't yet disagree, necessarily, but I'm trying to find a reason to.
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Unread 04-01-2009, 12:19
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Re: robot design question

I think the main obstacle to a design like this is how the GDC is going to define the "outer edge" of the robot. If they go with the convex hull sytle definition of the BUMPER PERIMETER, then all the easiest designs (seen above) are illegal. Then you'll have to come up with an even tinier robot that captures the trailer via the PVC pipes, or some support bars that articulate out from your robot when the match starts.
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  #23   Spotlight this post!  
Unread 04-01-2009, 12:40
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Re: robot design question

what program did u use to draw that? it seems really useful (msg 13)

Last edited by Matt times : 04-01-2009 at 12:44. Reason: clarification
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Unread 04-01-2009, 12:58
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Re: robot design question

The design would appear to be legal as you have bumper to bumper contact not bumper to trailer toung contace.

Keep in mind that with this configuration when you turn you will be sliding the trailer wheels sideways. Depending on the weight of the trailer your turning ability could be severely constricted.

We are considering a similar design but not for the trailer but for loading balls into the other teams trailers. This assumes we are fast and agile enough and to catch the other team.
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Unread 04-01-2009, 13:03
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Re: robot design question

Is the trailer hitch apart of the robot dimensions?
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Unread 04-01-2009, 14:18
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Re: robot design question

Quote:
Originally Posted by nahstobor View Post
Is the trailer hitch apart of the robot dimensions?
Yeah, it is.
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Unread 04-01-2009, 20:30
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Re: robot design question

Quote:
Originally Posted by Madison View Post
Out of curiosity, why do you think that the 6" length must be entirely backed by plywood?

I don't yet disagree, necessarily, but I'm trying to find a reason to.
<R08>
"A. BUMPERS must be built in segments, with a minimum length of six inches, ..."
"C. Each BUMPER segment must be backed by a piece of 3/4-inch thick by 5-inch tall piece of plywood."
"J. Corners and joints between BUMPER segments may be filled with short pieces of vertically oriented pool noodle, by wrapping the pool noodles around the corners, or by beveling the ends between adjacent segments so they form a tight and complete protective surface (see Figure 8 – 2)."

So foam can extend beyond the ends of the plywood to protect a robot corner, but the plywood must back up the entire bumper segment length.


And, maybe to answer my previous question, Figure 8-6 in the trailer hitch rule seems to show a wide-front robot. But then, the trailers in that figure aren't regular hexagons either, so maybe it's just a distorted drawing.
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Unread 05-01-2009, 14:56
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IS THE "HITCH" PART OF THE ROBOTS DEMENSIONS

OUR TEAM IS WONDERING IF THE HITCH IS PART OF THE ROBOTS DIMENSTION?

ANY INFORMATION ON THAT WOULD BE USEFUL.....THANK YOU
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Unread 05-01-2009, 15:03
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Re: IS THE "HITCH" PART OF THE ROBOTS DEMENSIONS

Quote:
Originally Posted by Team2339 View Post
OUR TEAM IS WONDERING IF THE HITCH IS PART OF THE ROBOTS DIMENSTION?

ANY INFORMATION ON THAT WOULD BE USEFUL.....THANK YOU
Please don't shout here... (aka "Please turn off Caps Lock")

And it is not listed as being specifically excluded under <R11> A; therefore it is included. Plan accordingly.
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Unread 05-01-2009, 19:21
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Re: robot design question

As far as I read the rules,

Quote:
Originally Posted by Iceman1330 View Post
I think what you are talking about is this. (16"x36" contact base)






The red areas are the "blocking spaces where balls can't be thrown. All measurements are ballpark (within 1-2" accurate, Proof of Concept)

The robot fits in the "box" and hugs at least half of the trailer. Weight issues might be a problem, but if you make the shroud light enough and place the batteries and heavy stuff in front you might be OK.
this is a legal idea.

Although *hint hint* you may consider alternative orientations of the robot for more coverage!
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Last edited by Petey : 05-01-2009 at 19:23.
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