Mechanics and Construction > Mechanics and Construction
Wire connectiions and rotating platforms
Nyx:
--- Quote from: Ro-Bot-X on August 27, 2007, 10:35:42 AM ---Build a PCB with as many circular traces as so many wires you need to go through. Then on a rectangular piece solder same number of flexible metal blades spaced so they will touch the circular traces like an old pick-up record player arm... Make sure you add some non conductive grease for easy rotation.
--- End quote ---
The problem with that is, while it will work for conducting power, for any kind of information transfer, it won't work well, because the contact will be lost at different points in the rotation... Now if you use a digital signal, you *may* be able to have an error correction scheme that can recover from it, but even then, that's a maybe. The other problem is that no matter what, the friction will end up damaging the contacts.
It depends on what you want, but as a previous poster mentioned, it's simpler if you just restrict the rotation... Think of a human torso... You can rotate so many degrees left, so many degrees right, but you can't do a complete rotation, unless you're possessed of course.
Robotboy86:
thanks guys :)
How do they do the radar thing on top of boats then???
paulstreats:
--- Quote from: Robotboy86 on August 27, 2007, 08:12:40 PM ---thanks guys :)
How do they do the radar thing on top of boats then???
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The actual spinning part is called a radar scanner. This has relatively no technology built into it.
The actual radar emitter is stationary allowing it to be wired to as normal, the scanner part spins around it (THIs is usually nothing more than a mirror which reflects the radar waves in whichever direction it is facing, because it is a mirror, radio waves reflect just like light waves (they are in the same spectrum) and therefore cannot travel through the back of the mirror.
The radar detector doesnt actually need to be focused in any way as the only waves that are available for it to pick up are obviously coming from the direction the mirror was pointing. This is why radar jammers can be used.
so the detector part isnt necesarily focused by the mirror
paulstreats:
an easier way to think about the above is an old light house, there is a stationary light bulb and a mirror directs the light.(ALSO used in police car lights etc..)
Robotboy86:
Thanks guys! I always wondered :)
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