Hej Bruce,
Bruce Griffiths wrote:
Hej Magnus
No one bothers with such gear ratios for a modern telescope as its
cheaper to use a computer than have a set of custom gears made.
In any case, direct drive of the axes is sometimes used - no gears:
http://www.halfmann-teleskoptechnik.com/e_index.htm
Calculating the time is just the beginning if you want to point to
Saturn for which the RA and DEC vary over time and the simple model
isn't very accurate:
http://ssd.jpl.nasa.gov/horizons.cgi
I was meaning mathematical gears, not mechanical gears.
The simplified approach was just to present an alternative for those in
need of a little less precission as their scopes and associated pointing
needs is a little less than the large scopes. Just as an idea. The main
idea was that the open-loop calculations could be simplified if a
calibration would create a closed-loop for the offset part and remaining
open-loop errors would be relative negligable for the application.
Cheers,
Magnus
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