www.robowars.org

RoboWars Australia Forum Index -> Rules, Safety, Administration

Arena Standards
Goto page Previous  1, 2, 3, 4, 5, 6, 7, 8  Next

Post new topic   Reply to topic
  Author    Thread
zcream



Joined: 11 Jan 2009
Posts: 12


 Reply with quote  
Info about Lexan (Polycarbonate)

Hi! I am actually looking to use Lexan as a window for an underwater enclosure. I had no idea that there was such a big difference between different polycarbonates.
Would someone know of a source of Lexan in Sydney, where I could get a sheet of Lexan - preferably something I could go scuba diving with ? I guess it would be at least 10mm thick..
Also, I could not find any source of Marine sealants - the one I looked at was polyurethane based, 3m 5200 Fast Cure Marine Sealant. The Sikaflex 291 and 292 that is commonly available does not seem to have the required strength.
Thanks!

Post Sun Jan 11, 2009 1:08 am 
 View user's profile Send private message Send e-mail
Nick
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


 Reply with quote  

Mulford Plastics is probably the cheapest, I think they only sell full sheets

Cut-to-size Plastics has less range but does what their name implies

Dotmar Plastics is a bit expensive but (supposedly) has a good range and engineering help.

Post Sun Jan 11, 2009 6:22 am 
 View user's profile Send private message
zcream



Joined: 11 Jan 2009
Posts: 12


 Reply with quote  
Offcuts

Thanks Nick. Any idea if someone provides offcuts too. I want to practice cutting them first, and the amount I need is really small to waste on an entire sheet.
I looked at the Mulfords range and the sheets seem quite large. My need was actually 10cm by 10cm or thereabouts.
Cheers!

Post Sun Jan 11, 2009 10:35 am 
 View user's profile Send private message Send e-mail
Nick
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


 Reply with quote  

Almost nobody does off-cuts Crying or Very sad For a small size piece, Cut to Size Plastics is definitely your best option.

Post Sun Jan 11, 2009 11:13 am 
 View user's profile Send private message
zcream



Joined: 11 Jan 2009
Posts: 12


 Reply with quote  
Sucks

Any idea what pricing to expect from Cut to Size (and the smallest pieces that they can do)
Ahhh. Sometimes I wish I had access to Amazon. 4 bucks for a 12"x24" Lexan sheet by a company called Small Parts Inc in the states Sad

Post Sun Jan 11, 2009 11:57 am 
 View user's profile Send private message Send e-mail
Nick
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


 Reply with quote  

No idea on the cost, but CTS can give you an instant quote over the phone. I found them relatively cheap. Any reason you can't order from O/S?

Post Sun Jan 11, 2009 12:23 pm 
 View user's profile Send private message
Glen
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect


 Reply with quote  

myself and andrew built our first few robots out of polycarb we found at a local private hardware store. 6mm and 10mm thick and came in some fairly huge sheets too - like 1m x 1m. i guess its where you look Smile

if you want to practice cutting it get a $10 chopping board from big w and attack that with a jigsaw to see what your in for. it cuts the same more or less. you just have to pour water on the cut to stop it "welding" back together after the cut.

if you want just some random scraps to play around with im sure i have some old broken chunks of 10mm floating around
_________________
www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz

Post Sun Jan 11, 2009 12:44 pm 
 View user's profile Send private message Send e-mail Visit poster's website MSN Messenger
zcream



Joined: 11 Jan 2009
Posts: 12


 Reply with quote  
Overseas

Actually I just looked at Amazon closely. The price doubles if I order overseas but still not bad.
I might practice on some offcuts and then order when I am sure of the thickness that I need.

Post Sun Jan 11, 2009 12:49 pm 
 View user's profile Send private message Send e-mail
seanet1310



Joined: 08 Nov 2006
Posts: 1265
Location: Adelaide


 Reply with quote  

Anyone know a place like NSW's "Cut to Size" in Victoria?
_________________
Remember to trust me, I am an Engineer.

http://www.youtube.com/watch?v=rp8hvyjZWHs

Post Sun Jan 25, 2009 1:06 pm 
 View user's profile Send private message Send e-mail Yahoo Messenger MSN Messenger
dyrodium
Experienced Roboteer


Joined: 24 Aug 2004
Posts: 6476
Location: Sydney


 Reply with quote  

Any CBC does plastics from cut to size or similar, they often have offcuts too in their branches. Smile
_________________
( •_•)

( •_•)>⌐■-■

(⌐■_■)

YEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH

Post Sun Jan 25, 2009 2:08 pm 
 View user's profile Send private message Visit poster's website MSN Messenger
timmeh
Experienced Roboteer


Joined: 20 Jul 2004
Posts: 2523
Location: Victoria


 Reply with quote  

Not sure if its the right thread but.

While i think of it it would be a good idea to sweep after every match not just after a spinner makes a decent amount of mess as if i remember correctly last event i judged at and other events there was arena crud getting jammed in peoples wheels.
_________________
Tim Team Reaper.

Post Tue Aug 04, 2009 7:37 pm 
 View user's profile Send private message Send e-mail
DumHed
Experienced Roboteer


Joined: 29 Jun 2004
Posts: 1219
Location: Sydney


 Reply with quote  

I have a pretty large sheet of 10mm polycarb sitting around.
It's in pretty good condition, but has had a few hinges bolted in along one edge (was used as a door on a boat)

It's about 600 x 1400mm from memory.

hehe just saw the date on this thread Razz
_________________
The Engine Whisperer - fixer of things


Last edited by DumHed on Tue Aug 04, 2009 7:48 pm; edited 1 time in total

Post Tue Aug 04, 2009 7:46 pm 
 View user's profile Send private message Visit poster's website MSN Messenger ICQ Number
Nick
Experienced Roboteer


Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW


 Reply with quote  

I don't really think is should be part of any 'rules', it is more of a personal choice for contestants. For important matches where I see too much crud in the arena, I sweep the arena myself to improve my chances. It should either be up to the competitors who made the mess or the competitors who follow them. I'm happy as long as the EO provides a broom! Laughing

Post Tue Aug 04, 2009 7:47 pm 
 View user's profile Send private message
timmeh
Experienced Roboteer


Joined: 20 Jul 2004
Posts: 2523
Location: Victoria


 Reply with quote  

I recons the judges could do it as part of there duties.

No one wants to go out cos there was a mess in the arena its not right.
_________________
Tim Team Reaper.

Post Tue Aug 04, 2009 7:51 pm 
 View user's profile Send private message Send e-mail
dyrodium
Experienced Roboteer


Joined: 24 Aug 2004
Posts: 6476
Location: Sydney


 Reply with quote  

Suppose so but after if i'm competing and it looks messy i'll take it upon my self to make sure its sweeped to my satisfaction. Smile If people can't be bothered then I suppose it's a bit so so. I've never really seen anyone go out because if debris anyway.
_________________
( •_•)

( •_•)>⌐■-■

(⌐■_■)

YEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH

Post Tue Aug 04, 2009 7:58 pm 
 View user's profile Send private message Visit poster's website MSN Messenger
  Display posts from previous:      

Forum Jump:
Jump to:  

Post new topic   Reply to topic
Page 7 of 8

Goto page Previous  1, 2, 3, 4, 5, 6, 7, 8  Next

Forum Rules:
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum

 

Last Thread | Next Thread  >
Powered by phpBB: © 2001 phpBB Group
millenniumFalcon Template By Vereor.