Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site cbscc.UUCP Path: utzoo!watmath!clyde!cbosgd!cbsck!cbscc!blt 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.