NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: New ways to create false horizons?
From: Pete Solon Palmer
Date: 2017 Jul 22, 21:12 -0400
From: Pete Solon Palmer
Date: 2017 Jul 22, 21:12 -0400
Hi Don,
<< high precision rotary encoders (14 bits or more) >>
Encoder (rotary & linear) is the term I was looking for. It's amazing how if I use the right term in a search engine, then the info spills out.
Just to throw up stupid ideas for everyone to knock down: The rotary encoder seems to be rated by resolution per turn. In the sextant we only need 1/4 turn so maybe we could gear it up 1:4 to increase the rez? Cons would include the complication of gears and gear lash. Linear encoder is lookin' good. Maybe have a low rez solution for degrees and a higher rez for the minutes?
<< incremental optical or magnetic encoders along the scale >>
That's what I'm thinking. Maybe something like a strut with a ball joint at each end. Could be immune to rough seas?
<< high precision rotary encoders (14 bits or more) >>
Encoder (rotary & linear) is the term I was looking for. It's amazing how if I use the right term in a search engine, then the info spills out.
Just to throw up stupid ideas for everyone to knock down: The rotary encoder seems to be rated by resolution per turn. In the sextant we only need 1/4 turn so maybe we could gear it up 1:4 to increase the rez? Cons would include the complication of gears and gear lash. Linear encoder is lookin' good. Maybe have a low rez solution for degrees and a higher rez for the minutes?
<< incremental optical or magnetic encoders along the scale >>
That's what I'm thinking. Maybe something like a strut with a ball joint at each end. Could be immune to rough seas?
Regards,
Pete
Pete
