Quote:
Originally Posted by Al Skierkiewicz
Large versions of this little screw are used to adjust position on satellite dishes all over the world. I work with one dish that has a lead screw for elevation and it is connected to a 3/4 HP motor with an electric brake. The screw is about 4' long and at least 2" in diameter. Another dish that is much larger has two, one for azimuth and one for elevation. Both can be operated by a hand crank or electric drill attachment. The dish is 6 meters in diameter.
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The dishes I worked on way back when used gear drive...10 meters with a pretty heavy equipment room attached to the az drive....
If you ever get the chance to peer into the workings of a 1957-59 Ford Retractable car, you can see several lead screws. An engineering marvel.
Indeed, the more ways you fail, the more ways you know something doesn't work.:) - Steven Sigley [more] 
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