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Unread 24-06-2002, 00:45
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Help Us!!!!!Please Respond ASAP

Posted by Alex at 2/12/2001 7:44 PM EST


Student on team #375, Robotic Plague, from Staten Island Technical High School and Verizon.



Eric hasnt answered my question yet and i am wondering if anyone can help....Can we use safty shatter resistant acrylic on our robot? is this plexiglass?

Thanks,
Alex
Team 375


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Re: Help Us!!!!!Please Respond ASAP

Posted by David Kelly at 2/12/2001 9:32 PM EST


Student on team #234, Cyber Blue, from Perry Meridian High School [IUPUI] and NASA KSC/ Rolls-Royce/ Trilithic/ Peregrine.


In Reply to: Help Us!!!!!Please Respond ASAP
Posted by Alex on 2/12/2001 7:44 PM EST:



I think you are talking about lexan. It is shatter resistant.

David Kelly
Student Captain/ Webmaster
Team 234

: Eric hasnt answered my question yet and i am wondering if anyone can help....Can we use safty shatter resistant acrylic on our robot? is this plexiglass?

: Thanks,
: Alex
: Team 375


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Re: acrylic and lexan are different

Posted by Joe Taylor at 2/12/2001 9:41 PM EST


Engineer on team #461, West Side Boiler Invasion, from West Lafayette High School and Purdue University / Schlomberger.


In Reply to: Help Us!!!!!Please Respond ASAP
Posted by Alex on 2/12/2001 7:44 PM EST:



"Plexiglass" is a polycarbonate plastic-GE sells it under the brand name lexan. This is different than acrylic, which may look similar but is far more brittle and thus prone to breakage. I would recomend polycarb if you plan on using it as a structural material. The acrylic will give you some troubles with drilling and especially tapping due to how brittle it is, and doesn't stand up too well to repeated bashing.
Hope thats helpful,
Joe Taylor


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Re: acrylic and lexan are different

Posted by Patrick Dingle at 2/12/2001 10:23 PM EST


Coach on team #639, Red B^2, from Ithaca High School and Cornell University.


In Reply to: Re: acrylic and lexan are different
Posted by Joe Taylor on 2/12/2001 9:41 PM EST:



We were faced with the same moral dilemma last week. We had a bunch of acrylic stuff lying around, but we looked in the rulebook and it is very clear that only "polycarbonate sheet" is allowed. The trade name for polycarbonate sheet is Lexan. Although it would be virtually impossible for anyone to tell the difference until it breaks, we ended up getting some lexan w/ accordance to the rules.

Patrick

: "Plexiglass" is a polycarbonate plastic-GE sells it under the brand name lexan. This is different than acrylic, which may look similar but is far more brittle and thus prone to breakage. I would recomend polycarb if you plan on using it as a structural material. The acrylic will give you some troubles with drilling and especially tapping due to how brittle it is, and doesn't stand up too well to repeated bashing.
: Hope thats helpful,
: Joe Taylor


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Polycarbonate 101

Posted by Andy Baker at 2/12/2001 11:11 PM EST


Engineer on team #45, TechnoKats, from Kokomo High School and Delphi Automotive Systems.


In Reply to: Help Us!!!!!Please Respond ASAP
Posted by Alex on 2/12/2001 7:44 PM EST:



For FIRST robots, we cannot use acrylic (trade name "Plexiglas&quot, but we can use polycarbonate.

There is a reason for this... acrylic is not tough enough. Trust FIRST, use polycarbonate. It has much higher strength qualities than acrylic. Acrylic will crack and shatter, while polycarbonate will bend and resist breaking.

As for bending, polycarbonate is great. We used it extensively in '99 for an all-polycarbonate arm made from 1/16" thick material. The HOT team built a beautiful 'bot last year, and their body (or frame) was totally out of polycarbonate. You can put this stuff in a sheet metal break and it will (somewhat) hold it's shape. Once you form it, use 1/4" long aluminum rivets to fasten it into tubes or boxes.

Polycarbonate is not only called LEXAN. There are other brands that are cheaper... look around. Hyzod is another brand name, made by Hoescht-Celenease (sp?), and Dow Chemical makes a brand. This stuff is a commodity these days. GE Plastics invented the stuff (Dan Fox, 1963), and they still make the purest polycarbonate... like the stuff that makes CDs.

Oh well, I'll stop. By the way, in a former life, I used to be a co-op at GE Plastics.

Andy B.


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question...

Posted by Anton Abaya at 2/13/2001 12:28 AM EST


Coach on team #419, Rambots, from UMass Boston / BC High and NONE AT THE MOMENT! .


In Reply to: Polycarbonate 101
Posted by Andy Baker on 2/12/2001 11:11 PM EST:



1. can they tell the difference? (esp small quantities)

2. can they be used in small quantities? like say to mount a speed controller or something?

-anton


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Re: question...

Posted by Joe Ross at 2/13/2001 12:34 AM EST


Engineer on team #330, Beach Bot, from Hope Chapel Academy and NASA/JPL , J&F Machine, and Raytheon.


In Reply to: question...
Posted by Anton Abaya on 2/13/2001 12:28 AM EST:



: 1. can they tell the difference? (esp small quantities)

most likely not

: 2. can they be used in small quantities? like say to mount a speed controller or something?

no, unless you want to break the rules.


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Re: question...

Posted by Anton Abaya at 2/13/2001 1:10 AM EST


Coach on team #419, Rambots, from UMass Boston / BC High and NONE AT THE MOMENT! .


In Reply to: Re: question...
Posted by Joe Ross on 2/13/2001 12:34 AM EST:



: : 1. can they tell the difference? (esp small quantities)

: most likely not

: : 2. can they be used in small quantities? like say to mount a speed controller or something?

: no, unless you want to break the rules.

yea i agree we'll replace the plexi stuff if i can figure out where the guy who mounted em hid it.

on the other hand, the rule is really there because FIRST doesnt want to clean up shattered plexiglass. safety purposes too i guess, but if it's practically just there for even decorative purposes (or hardly of any use or prone to stress), then it really doesnt matter..right?
correct me if i am wrong. i go by the rules, they're there for a reason.
-anton
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Yes, you can tell the diff... if you look

Posted by Andy Baker at 2/13/2001 12:35 AM EST


Engineer on team #45, TechnoKats, from Kokomo High School and Delphi Automotive Systems.


In Reply to: question...
Posted by Anton Abaya on 2/13/2001 12:28 AM EST:



: 1. can they tell the difference? (esp small quantities)

If you look at the edge of a sheet of polycarbonate, it looks kinda blueish. If you look at the edge of acrylic, it looks whiteish.

: 2. can they be used in small quantities? like say to mount a speed controller or something?

ummm... No, I don't think so. But I cannot see that an inspector is gonna check for something as detailed as this.

: -anton

Now that you've brought attention to yourself, you better change them out, you ninny.

Andy B.



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ninny? heh

Posted by Anton Abaya at 2/13/2001 1:07 AM EST


Coach on team #419, Rambots, from UMass Boston / BC High and NONE AT THE MOMENT! .


In Reply to: Yes, you can tell the diff... if you look
Posted by Andy Baker on 2/13/2001 12:35 AM EST:



they'll (ahem) never notice. i've painted them black. ahem ahem.....

nah, we used lexan on practically everything to mount it on. i think we have a couple small pieces that are plexi by accident cuz they got mixed with our lexan stock. no matter though cuz they're too small to notice. i think we used em as shims or something.

-anton
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