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Unread 03-01-2009, 12:00
Zach226-PRLead Zach226-PRLead is offline
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Exclamation The Game Floor

Ok, does anybody know what the game floors actual technical name is and/or where (if possible) can you get some, or know of any place that you can go to and use a floor of similar characteristics
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Unread 03-01-2009, 12:04
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Re: The Game Floor

Quote:
The majority of the CRATER is covered by a 24-foot by 50-foot surface known as the “REGOLITH.” The REGOLITH is made of “Glasliner FRPtm” gel-coated, fiberglass-reinforced, polymer material. This forms a tough, rigid surface that has been specifically selected to have a low coefficient of friction with the acetal-treaded ROVER WHEELS used by the ROBOTS.
From Section 6 of the manual.
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Unread 03-01-2009, 12:09
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Re: The Game Floor

do u have any idea where we can get regolith or something like it for a mock up crater?
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Unread 03-01-2009, 12:28
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Re: The Game Floor

how can we drive on this without crashing?
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Unread 03-01-2009, 12:39
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Re: The Game Floor

Quote:
Originally Posted by sPod View Post
how can we drive on this without crashing?
Very carefully. Sorry, but you're just going to have to be very careful.
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Unread 03-01-2009, 14:27
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Re: The Game Floor

Crashing is inevitable. However, lower friction reduces chance for damage. Instead of holding its ground and crunching, it slides out of the way. That's why the rules are more lenient.
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Unread 03-01-2009, 15:10
Dave Flowerday Dave Flowerday is offline
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Re: The Game Floor

The manual indicates that it's supposed to be the Gel-Coated Glasliner FRP (which is smooth), but pictures from the kickoff event show the floor being the pebble-textured Glasliner FRP. I assume the actual material used at kickoff was correct, but you know what they say about assuming things...
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Unread 03-01-2009, 15:32
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Re: The Game Floor

Menards sells this very simmilar FRP panel by the paneling I believe the current cost (West Michigan) is something close to $27 for a 4X8 sheet.

-Mike AA
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Unread 03-01-2009, 15:54
Dave Flowerday Dave Flowerday is offline
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Re: The Game Floor

Quote:
Originally Posted by Mike AA View Post
I believe the current cost (West Michigan) is something close to $27 for a 4X8 sheet.
...or about $1500 to cover a full field... ouch.

We picked up 2 sheets already for about $30 each.
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Unread 03-01-2009, 16:27
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Re: The Game Floor

Also worthy of note is the coefficients of friction listed in the manual
Quote:
Inline, static: 0.06
Inline, dynamic: 0.05
Transverse, static: 0.14
Transverse, dynamic: 0.10
this means that it takes something like 10 seconds to cross the field at the very best. (Force of friction=force exerted on robot sideways, max acceleration = g*mu, mu inline static=.06, thus g*mu=.588 m/s^2)
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Unread 03-01-2009, 16:35
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Re: The Game Floor

The floor looks like the fake ice I've seen at some hockey camps.
A few years ago I had a couple sheets of it to work on my goalie training.
Sadly the place I got it from is no longer in business and I don't remember the exact name of it but I've seen similar stuff at Hockey Giant for about $30 per 4x8 sheet.

-p
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Unread 03-01-2009, 16:45
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Re: The Game Floor

I have to ask this, the rules state that we can buy and use additional official 2009 first wheels. I suggested that making a bot with multiple wheels (12 wheeled beast) would give us an edge however someone said that it would just redistribute the weight.

What I'm asking is (to someone who knows more physics) will more wheels (more surface area) give any real increase in traction? If so (or not) how is this calculated?

Thanks,
-Cody
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Unread 03-01-2009, 17:27
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Re: The Game Floor

Frictional force is completely independent of surface area.
Maximum frictional force is simply the weight of the robot times the coefficient of friction. Ff = u*Fn
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Unread 03-01-2009, 17:31
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Re: The Game Floor

So make you bot as close to 120 lbs as possible and don't worry about surface area. Hummmm...
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Unread 03-01-2009, 17:32
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Re: The Game Floor

... or, to put it differently ... you can decide to put 1/4 of your weight on each of 4 wheels, or you can put 1/12 of your weight on each of 12 wheels.

... but if you aren't driving all 12 of the wheels, your net amount of force that turns into robot locomotion is cut waaaay back.
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