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From: (no name) (no email)
Date: Fri Mar 07 2008 - 09:01:53 EST
In a message dated 3/7/08 12:01:28 AM, Butch writes:
> It's simply a small magnet epoxied to the
> inside of the gypsy and a sensor that detects each time the gypsy rotates
> and
> calculates the amount of chain taken in and let out. Does anyone have any
> experience with this or any other chain counter?
>
No experience with this as a chain counter - but, this is the way all modern
electronic bicycle speedometers work. A magnet is affixed to the wheel which
passes by a pickup on the bicycle fork each rotation. The speedometer head
counts the number of revolutions and multiplies it by the circumference of the
wheel to calculate speed, distance, etc. These devices have proven extremely
reliable, are waterproof, and contain and internal battery which powers the tiny
computer for years.
I've used one of these devices to measure the RPM of my propeller shaft and
estimate boat speed by persuading the speedometer head to accept the calculated
advance of my boat for each propeller rotation as the hypothetical bike wheel
circumference.
Larry Z
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