Now we all know a lot more! Karl ----- Original Message ----- From: "David Beierl" <dbeierl@IBM.NET> To: <vanagon@GERRY.VANAGON.COM> Sent: Monday, May 08, 2000 2:47 PM Subject: Re: Speedometer problems
> At 15:13 5/8/2000, Karl Wolz wrote: > >and I was told it was due to a "slipped magnet". Now you know as much as I > >do. > > Karl, I believe these things operate by spinning a magnet in close > proximity to an aluminum disk which carries the pointer. The rotating > magnetic field induces a current in the disk, which in turn generates a > magnetic field that interacts with the one from the magnet, and causes the > disk to rotate against the tension of a hairspring. The intensity of > interaction and hence the rotating force is increased as the magnet is > moved closer to the disk -- setting this distance is part of the initial > calibration of the instrument. > > david > David Beierl - Providence, RI > http://pws.prserv.net/synergy/Vanagon/ > '84 Westy "Dutiful Passage" > '85 GL "Poor Relation" |
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