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  #16   Spotlight this post!  
Unread 06-07-2006, 02:54 PM
Rohith Surampudi's Avatar
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Re: Extension Mechanism

I would suggest the usage of NiTinol Wire that can be found here Nitinol stands for NIckel TItanium Naval Ordnance Laboratory, it is a shape memory wire, that will resume its original shape if a charge is run through it. To choose the shape, all you need to do is bend the wire to the shape you want it to return to, then heat up the bent areas, or the entire thing. The only problem i could forsee, is that because of the heat that is produced by the resistance, NiTinol wire does note come with the rubber coating, therefore it is open voltage. Fairly thin pieces can be obtained in order to only require a small amount of power, but the thicker the wire is, the more power it will require. If you have any questions please email me, Good luck
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Unread 06-07-2006, 02:56 PM
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Re: Extension Mechanism

Quote:
Originally Posted by Andy Baker
Does anyone have any old videos or pictures of tape measure deployment or coils of spring steel unrolling from the 2002 FIRST Competition? If this mechanism is legal for Acer's competition, we can all pick the best of these mechanisms and give Acer some good examples.

292 had a motorized tape measure by the end of the season... it was really neat.

111 had a reliable unrolling steel coil.

535 had a bigger version of a motorized coil... it was very impressive.

Andy
I do, but they're all on VHS
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Unread 06-07-2006, 05:30 PM
acer_7 acer_7 is offline
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Re: Extension Mechanism

Great ideas ! I hope u can supply me with more details concerning the tape issue.

To give u more idea about my competition, you can download the rules and see its video from the following site http://www.robofest.org.my/robocon2006/

I don't know if u've ever heard of ABU robocon contest before. It's an international competition for the member countries Asia Broadcasting Union (ABU). It includes Japan, China, Korea, Egypt, Vietnam, Malaysia....etc

Each year a country hosts the event but before the international event there's a local competition in each country to choose the team representing your country. The competition includes a manual robot and several automatic robots and there's a specific task to do. Ur limited within a specific weight and a specific dimension.

The following link http://gymkhana.iitb.ac.in/~umic/vid...robocon2k5.wmv
gives u an idea how the international competition was fierce last year. U'll see the fastest extensions u have ever seen in ur life.

By the way I forgot to introduce myself. I am a student at the Electronics and Communications department, Faculty of Engineering, Cairo University. Glad to meet u all
  #19   Spotlight this post!  
Unread 06-07-2006, 06:17 PM
sanddrag sanddrag is offline
back to school ;-)
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Re: Extension Mechanism

Wow, what a great video. Man, and I thought FRC was hard. And look how lightweight those robots are - they pick them up with one hand!

I'm concerned about safety with humans on the field with the robots though. That looked very dangerous to me. Safety is one thing FIRST has done very well.

How long do you get to build these things anyway?
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  #20   Spotlight this post!  
Unread 06-07-2006, 06:29 PM
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Re: Extension Mechanism

Quote:
Originally Posted by acer_7
The following link http://gymkhana.iitb.ac.in/~umic/vid...robocon2k5.wmv
gives u an idea how the international competition was fierce last year. U'll see the fastest extensions u have ever seen in ur life.

By the way I forgot to introduce myself. I am a student at the Electronics and Communications department, Faculty of Engineering, Cairo University. Glad to meet u all

Heh, i see dumper bots
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Unread 06-07-2006, 07:48 PM
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Re: Extension Mechanism

Quote:
Originally Posted by acer_7
Great ideas ! I hope u can supply me with more details concerning the tape issue.

To give u more idea about my competition, you can download the rules and see its video from the following site http://www.robofest.org.my/robocon2006/

I don't know if u've ever heard of ABU robocon contest before. It's an international competition for the member countries Asia Broadcasting Union (ABU). It includes Japan, China, Korea, Egypt, Vietnam, Malaysia....etc

Each year a country hosts the event but before the international event there's a local competition in each country to choose the team representing your country. The competition includes a manual robot and several automatic robots and there's a specific task to do. Ur limited within a specific weight and a specific dimension.

The following link http://gymkhana.iitb.ac.in/~umic/vid...robocon2k5.wmv
gives u an idea how the international competition was fierce last year. U'll see the fastest extensions u have ever seen in ur life.

By the way I forgot to introduce myself. I am a student at the Electronics and Communications department, Faculty of Engineering, Cairo University. Glad to meet u all
Holy smokes! Now THAT looks like fun!

I like the combination of autonomous-only and human-operated robots running at the same time. (It seems like we could do something similar with Vex, but on a smaller scale.)
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  #22   Spotlight this post!  
Unread 06-07-2006, 08:37 PM
Richard Wallace's Avatar
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Re: Extension Mechanism

Quote:
Originally Posted by acer_7
... To give u more idea about my competition, you can download the rules and see its video from the following site http://www.robofest.org.my/robocon2006/

I don't know if u've ever heard of ABU robocon contest before. It's an international competition for the member countries Asia Broadcasting Union (ABU). It includes Japan, China, Korea, Egypt, Vietnam, Malaysia....etc

Each year a country hosts the event but before the international event there's a local competition in each country to choose the team representing your country. The competition includes a manual robot and several automatic robots and there's a specific task to do. Ur limited within a specific weight and a specific dimension.

The following link http://gymkhana.iitb.ac.in/~umic/vid...robocon2k5.wmv
gives u an idea how the international competition was fierce last year. U'll see the fastest extensions u have ever seen in ur life.

By the way I forgot to introduce myself. I am a student at the Electronics and Communications department, Faculty of Engineering, Cairo University. Glad to meet u all
I read the rules and FAQ for ABU Robocon. It seems like an exciting competition. You and your team at Cairo University will probably be very busy until the first week of July, preparing for your national competition. Good luck with that.

Will the winner of your national competition get to represent Egypt at the September event in Kuala Lumpur? How many teams will be competing in your national event?
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Unread 06-08-2006, 04:03 AM
acer_7 acer_7 is offline
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Re: Extension Mechanism

Actually, safety is very important in this competition. Dangerous robots aren't allowed to join the contest. There's also a robot test before the competition to make sure of safety and ensure restrictions as well.

I am in the middle of my final exams now. I am supposed to finish them on the 17th of July then I will work through 2 weeks to get ready for our competition from 2-6 July. That's why I am trying to look up for as many ideas as I can to try through this period of time. So, please if u gotta anymore ideas i will be glad to hear them.

There are about 67 teams joining the national competition this year. The winner will represent Egypt in Kuala Lumpur.

After some of u have seen the video, u've seen what I mean. I don't need a stiff extension, just a one that blocks the target for the opponent robot. I don't need my extension mechanism to be that fast. China has used pneumatic mechanism with bamboo fishing rods while Japan has used springs.

Check this link http://www.tpa.or.th/robot/tparobot/...e/DSC_0374.jpg
This if from this year's Thailand competition

I have the following thoughts:
======================
- A fishing rod with a motor and a wire (or tape) [but I just need to understand how to install it]
- Something like that picture (see the inclined extension). It consists of successive layers beside each other.

What do u think ? (especially that my time is limited after my exams, I have only 2 weeks beside the work in the other robots)
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Unread 06-08-2006, 08:55 AM
Richard Wallace's Avatar
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Re: Extension Mechanism

I noticed in the rules for ABU Robocon that the machines must be handmade.

Does "handmade" mean you are not allowed to used automated processes or tools to fabricate components of the machine? What about power tools? Do you have to fabricate all the parts of your machine by hand? And are there any restrictions on what purchased parts you can use or how much you can spend on parts?
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Unread 06-08-2006, 12:38 PM
acer_7 acer_7 is offline
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Re: Extension Mechanism

'handmade' means that u don't buy a complete robot arm for example. We are allowed to use tools to build our robot. Actually most of the teams go to workshops for cutting and welding aluminium for example. U sometimes need blacksmith work; like attaching the motor to ur wheels. U can buy simple ready things but not whole made things.
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Unread 06-08-2006, 12:50 PM
Richard Wallace's Avatar
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Re: Extension Mechanism

That seems very reasonable. Back in the early years of our competition, FIRST had fairly simple rules. More recently, the rules have generally become more complex each year. For several years now we have had increasingly intricate rules aimed at keeping our robots "handmade". These take the form of limits on total cost of purchased materials and components, limits on the cost of individual components, and a rather lawyerly definition of what is a commercial off-the-shelf (COTS) component. You can find the rules governing robot construction for 2006 FIRST robotics competition here.

I am really drawn to the idea of replacing a large portion of our robot rules with the simpler requirement that the robot must be handmade.
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Unread 06-08-2006, 03:28 PM
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Re: Extension Mechanism

I don't know about FIRST actually. I took a quick look at the rules and found that u use kits for making robots. That's totally opposing to us, I can't remember anything we've bought ready-made till now. We even search the surplus markets for special types of nuts to combine aluminium sheets together so that they won't separate.
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Unread 06-08-2006, 07:21 PM
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Re: Extension Mechanism

Quote:
Originally Posted by acer_7
I took a quick look at the rules and found that u use kits for making robots.
Don't misunderstand the meaning of "Kit of Parts". It's not a robot kit. It's essentially a bin of donated motors, pneumatic components, gears, connectors, chains, wheels, cheap joysticks, software, sealed lead-acid batteries, etc.

There are a few more high-level things in the KoP: the equivalent of an erector set for making a simple chassis if you want to, reducing gearboxes (some assembly required)...and the full programmable control system with RF communication. But it's not a "robot kit" that teams "put together" to make robots.
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Unread 06-09-2006, 06:03 AM
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Re: Extension Mechanism

Hey guys,
Does anyone one knows how does the car antenna extend (from the mechanical and electrical sides)?
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Unread 06-09-2006, 07:39 AM
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Re: Extension Mechanism

Quote:
Originally Posted by acer_7
Hey guys,
Does anyone one knows how does the car antenna extend (from the mechanical and electrical sides)?
On most vehicles, its a 12 V DC motor with a pulley and a stiff cable that's pushed upward or pulled downward.

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