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From: gino@voder.UUCP (Gino Bloch)
Newsgroups: net.auto
Subject: Re: Fixing speedometer/odometer rate?
Message-ID: <628@voder.UUCP>
Date: Mon, 14-Jan-85 13:34:00 EST
Article-I.D.: voder.628
Posted: Mon Jan 14 13:34:00 1985
Date-Received: Wed, 16-Jan-85 06:02:18 EST
References: <3101@ucla-cs.ARPA> <1169@ut-ngp.UUCP>
Organization: National Semiconductor, Santa Clara
Lines: 26

[roll on, line-eater]

After several confusing articles, I have to point out some definitions.

    ODometer: a device to measure distance travelled (the set of little
	      wheels with numbers on the edges, giving readouts like
	      00375.4)

    SPEEDometer: a device to measure (instantaneous) speed (usually a
	      fixed disk with marks around the edge and a needle-like
	      readout that changes its orientation as the car speed
	      changes; it is read by visually noting the needle's position
	      with respect to the disk's edge marks)
Thus, if the odometer is off, you must correct it by changing one or more
of:  the tires, the speedometer assembly (the odometer is mounted inside it),
the gears inside the speedometer, or the gears at the transmission end of the
speedometer cable.  If the speedometer is inaccurate, you can diddle with
the internal spring, or you can paste a new scale over the existing one,
or you can file the magnet or the cup that it drives.  If you change the
odometer gearing at the transmission end, the speedometer will also change
its calibration, so it might need adjustment - but do the gears first.
It is possible, but not necessary, that the speedometer readout is
independent of the (internal) odometer gearing.
-- 
Gene E. Bloch (...!nsc!voder!gino)
Extend USENET to omicron Ceti.