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#1
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Re: Extension Mechanism
Umm . . I will try to explain it more guys & thx for all these replies.
Inspite of the extension being desired to be 6-7 meteres, I don't need it to be stiff at all. I just want it to reach a specific area. The robot competition - I am participating in - has a special playground. Besides, I got a specific start zone for my robots that has limited dimensions. The robot carrying this extension mechanism should have a maximum dimension of 500*1000*2000mm (2000mm is the height). The scissors mechanism is great but for such distance I need to use large ones and I don't have the place for it as I am using my robot for other things and there are other stuff placed on it. Can't the forklifting mechanism be modified for such purpose ? I also thought that I would use a fishing rod but I couldn't get an idea for extending them using motors or pulleys. Air was another idea to use in extending the rod but to use that I need an electromagnetic switch and other pneumatic stuff. |
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#2
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Re: Extension Mechanism
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Is the arm simply touching something 6-7 meters away? If so, then the above suggestion works well. Good luck, Andy B. |
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#3
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Re: Extension Mechanism
Can this be a one-shot mechanism; i.e., can it start within the original 500 x 1000 x 2000 limits, then deploy once to reach the 6000 - 7000 height, requiring manual intervention to get it back to the starting configuration?
And how much payload do you need to raise to the target height? [edit: I was thinking of some shock-corded tent poles with sections of fishing rod to deploy them.] Last edited by Richard Wallace : 07-06-2006 at 14:12. |
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#4
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Re: Extension Mechanism
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#5
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Re: Extension Mechanism
Here, coudl you string 6 of these together and using one pneumatic piston to get the first on out. Then you could hinge the rest together and use a fishing line and rell to pull on them and get them out?
http://www.chiefdelphi.com/media/photos/25088 |
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#6
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Re: Extension Mechanism
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Acer, Are the rules published on the web so we can see them? It might help if we could get a complete picture. Several years ago, our competition had a requirement that allowed many teams to use Andy's suggestion above. There was great fun and anticipation waiting for the "magic tongue" to deploy at the end of a match. |
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#7
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Re: Extension Mechanism
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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 |
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#8
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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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#9
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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 ![]() |
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#10
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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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#11
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Re: Extension Mechanism
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Heh, i see dumper bots |
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#12
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Re: Extension Mechanism
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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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#13
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Re: Extension Mechanism
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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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#14
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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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#15
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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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