[GreenKeys] Nylon and fiber gears

[Jerry Murphy]

Teletype Corp. tried nylon gears that were embedded with molybdenum disulfide
in the hopes of getting lower friction in the gear train.  The treated element
was always the pinion - the small gear.  The large gear was always just plain
nylon.  Easy to tell the molybdenum pinions because they were always dark gray 
while 'untreated' gears were white.  For whatever reason, this trial did not 
work out and pinions went back to being made out of plain (white) nylon.  The
added cost of molybdenum disulfide pinions may not have been justified by any
performance gain.  The gray and the white pinions had the same part number. 

Here's a link to the notification where the molybdenum disulfide pinions are
being dropped:

     http://www.navy-radio.com/manuals/tty/573-115-800-ch-04-25.pdf

There are several changes in this link.  The specific one covering the pinions 
is here:     573-115-800.19      See page 15 of 24.  Note that the only gears 
that are mentioned are the 75 and 100 WPM pinions.  At some point, the 60 WPM 
pinion was also dropped from the molybdenum disulfide experiment.

Jerry Murphy