The point is the self-centering action which allows positioning down to
one arcsec.
See https://de.wikipedia.org/wiki/Hirth-Verzahnung
Peter
Am 28.08.2020 um 12:54 schrieb andy pugh:
On Fri, 28 Aug 2020 at 11:21, Thomas J Powderly <[email protected]> wrote:
Gene an old client called about using a Newbould indexer on his machine.
That's rather clever, using a differential indexer to get finer graduations.
The idea goes back a long time, the same principle was used for
magneto couplings in the early days of motoring:
https://commons.wikimedia.org/wiki/File:Vernier_coupling_(Manual_of_Driving_and_Maintenance).jpg
Though the example in the video seems different, and in fact _appears_
to be using a non-integer number of teeth in the bottom interface...
Another unexpected place that you might find a Hirth coupling is in
the middle of a set of bicycle cranks:
https://www.parktool.com/blog/calvins-corner/campagnolo-ultra-torque-and-record-group
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