>magnetic field strength. For my MG TF-1500 I set up a drill motor on
the bench with a speed controller, optical shaft pickup and frequency
counter to drive the speedo at known speeds. I put a large DC current
thru a Radio Shack tape degausser to magnetize the speedo's bar to a
high field strength, then carefully used AC on the degausser to decrease
the field strength till the speedo read correctly. It worked!
< -Dave Plumpe
You've GOT to be kidding! High-tech meets Brit-tech! I should think
that the the PROPER way to calibrate a Jaeger or Smiths speedometer
would involve something like taking a small length of narrow diameter
hose and feeding in through the back of the Speedometer and driving
around while blowing into the hose with your ear to the instrument in
order to listen for the proper change in pitch. If it's too high,
dismantle the differential and replace the pinion gear with one
of lower ratio. If too low, with one of higher ratio. Repeat
until the pitch is right, or the car is totaled. "Reassembly is
simply the reverse of the above."
Seriously: is this how it's normally done, or do you now have something
marketable?
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*Philippe Tusler - El Toro, CA '57 MGA Roadster *
*A-Mail: <TUSLER@MP050> '66 MG/MGB-GT *
*InterNet: TUSLER@MP050.MV-OC.unisys.com '88 ISUZU Trooper*
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