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dyrodium
Experienced Roboteer
Joined: 24 Aug 2004
Posts: 6476
Location: Sydney
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Alrighty guys, the date is looming and well, I need some help now.
Arena is almost done, but needs a roof. I'm open to ideas, basically it can be something that'll be good enough for this event and the field of robots and improved later on with 3mm polycarb. We have the funds for it but I don't have the time. Also need to determine some kind of arena lighting but that depends on the roof. Basically the thing needs to be 2440 x 2440 and just sits on top. Without assistance transporting mdf sheets to the uni is impossible, how do people feel about two layers of heavy duty shadecloth/tarp? I know it's not ideal but running out of options.
We will need 3 dedicated judges for the day, ideally people who arn't competing. The matches will be run hard and fast and judges will have to be relied fairly heavy upon. I'm intending to compete but if I can't due to lack of time i'll fill one of the spots.
Prizes: We need some, I can buy some with funds raised or if anyone has something they would like to donate please send me a PM...
Lastly would like to confirm with everyone that we will start weighin/safety at 9AM for a 10AM start, this will have to be done really rapidly so come with your bots charged, assembled and ready to go or risk missing out on the first round. The rounds will be called 5min before to place your robot on a marshalling table. Failure to get your bot there in time for the round means you forfeit that round. Harsh, but with a record number of ants and beetles it's just how things have to be.
Cheers Angus.
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YEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH
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Wed Aug 03, 2011 7:36 pm |
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Nick
Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
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The torsion box roof would look like a giant piece of corflute sheet IE a thin 3mm skin of plywood with light wooden battons sandwiched between; Try to avoid MDF sheet; it has a much lower strength to weight ratio and is quite a bit denser than MDF so its much harder to get it to span long distances. Putting it together would be a bit more work than screwing ali angle to wood - withthe ali you would have to drill holes and use sheet metal screws, while with an all wood torsion box you have to lay a bead of adhesive and then nail with a gun. If you never used a nail gun before, you will be AMAZED how fast things go together!
Unless you have access to cheap aluminium section, another idea might be the C section steel used between plasterboard walls, it is probably much cheaper than aluminium and it you skin it with 3mm ply on both sides, it won't look too bad. If you use steel, you can use self-drilling sheet metal screws to assemble the roof. Steel is also much less elastic than aluminium, so the roof should be stiffer.
If you do something like the above, you can make it longer just by adding a strip of ply to one end; you just need to get the wood / aluminium / steel longer than 2.4 M
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Thu Aug 04, 2011 1:24 am |
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