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Re: Is this a "digital sextant"?
From: Brad Morris
Date: 2019 Aug 16, 13:42 -0400
From: Brad Morris
Date: 2019 Aug 16, 13:42 -0400
Hi Bill
The limitation will not be a rotary encoder. In the 1980's, I used many rotary encoders with over 1M counts (divisions) per revolution. That is dwarfed by current Hiedenhein encoders at 2^29 counts per revolution (536M)
That kind of resolution is far beyond anything a sextant could require. 0'.1 micrometer sextants are the equivalent of 216,000 counts per revolution, when extended to a full circle.
Brad
On Fri, Aug 16, 2019, 1:18 PM Bill Lionheart <NoReply_Lionheart@fer3.com> wrote:
Found on the online collection of the Royal Greenwich Museum https://collections.rmg.co.uk/collections/objects/256558.html The description says the micrometer is motorized. My first thought was it was a rotary encoder rather than a motor. Any ideas?
Bill L.
