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Spockie-Tech
Site Admin
Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia
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Problem is, electromagnetic Force varies inversely as the square of the distance.. ( I awlays wanted to say that.. )
Or in plain language, if you double the distance from a magnet, the field is 4x as weak, 3 times as far, and its 9x as weak, so you need a hugely powerful magnet to operate at any appreciable distance.
Probably the best bet would be some form of ferrous metal grid that the airstream passed through with magnets attached to it at strategic places. it wouldnt grab aluminium bits, but most bolts/bearings etc have ferrous metals in them, so it should stick to most of the bits people are likely to want to recover..
At the last RoboWars, I had to go an scour the arena for a nut and bolt off I.G.'s drive adapters. The bolt was easy, the nut had hidden down in the vertical gaps at the side of the arena.. _________________ Great minds discuss ideas. Average minds discuss events. Small minds discuss people
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Wed Jul 27, 2005 12:23 am |
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DavidM
Joined: 07 Jul 2004
Posts: 41
Location: Victoria, Australia, Earth, Milky Way Galaxy
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There's a book called "Mobile Robots" by the guys at the MIT robot labs. The first robot in the book is a absolute cracker, it controls two motors and effectively does the autopilot - bounce of the wall thing - with no processors and only a handful of parts (4 resistors, 2 capacitors, 2 transistors, 4 diodes and two relays). The construction is done on one of those white plug in experimenter boards - ok for vacuums probably not combat!
Provided the robot moves slow the simple controller would work fine, if its fast the relays and motors will take a hammering and the change in acceleration would take its toll on the chassis.
Another book "Vehicles" by Braitenberg, although not nuts and bolts one like "Mobile Robots" does illustrate the kind of behaviours that can be created from simple robots using analog circuits as very very simple neurons.
Off course the big advantages are its simple to build, cheap, not voltage sensitive, and more immune to EMI than Mr Pic or Atmel. _________________ "Limitation shows the Master."
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Thu Jul 28, 2005 10:01 pm |
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