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From: blt@cbscc.UUCP (Brian L. Tymchak)
Newsgroups: net.auto
Subject: Re: speedo rates, Chevy style
Message-ID: <4576@cbscc.UUCP>
Date: Fri, 11-Jan-85 08:16:04 EST
Article-I.D.: cbscc.4576
Posted: Fri Jan 11 08:16:04 1985
Date-Received: Sat, 12-Jan-85 07:52:17 EST
References: <3101@ucla-cs.ARPA> Having put a little stint in at a local Chevy dealer parts department
Organization: AT&T Bell Laboratories , Columbus
Lines: 11

before moving into a real job, I know that Chevrolet speedometer gears
are differentiated by the number of teeth on the gear; I imagine this
is true in most other makes of vehicles.  A variation of one tooth on
this gear will result in a variance of the speedometer anywhere from
~3 to ~4.5 mph.  The range is dependent upon the other tolerances in
the system.
   Putting finer teeth on the gear to cut this range down leads to
much quicker failure rates of the gear since this gear actually takes
quite a beating.  Hence, 2.8% variation, or a couple mph isn't really
all that bad.  If someone finds or knows of a supplier that handles
precision plastic gears, spread the word.