General Category > General Discussion

Revealing how old speedos work

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faffi:
https://www.youtube.com/shorts/c2anOscRHDQ

Dr. Enzo Toma:
Even older, Corbin mechanical speedos ran off a gear drive opposite the sprocket. Common on Harleys and Indians.

Kiwi_Roy:
The spinning magnet induces a current in the Aluminium disc the current is shorted out so it converts to a torque acting against a hair spring.
Modern electronic speedos are driven by stepper motors with the position calculated by microprocessor.
Speedhut make  whole range of stepper motor instruments.

PeteS:
Much cooler and older are the Smiths Chronometrics.

https://www.youtube.com/watch?v=VPkX5sy_OiA


Pete

Kiwi_Roy:

--- Quote from: PeteS on August 05, 2024, 08:15:22 PM ---Much cooler and older are the Smiths Chronometrics.

https://www.youtube.com/watch?v=VPkX5sy_OiA


Pete

--- End quote ---
I agree, the police cars where i grew up used Smiths Chronometric speedos for accuracy
Lots of Brit bikes had them.
Roy

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