[acer_7]

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.