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Richard,
A quick way to graduate a large circle is to use an old tape
measure blade.
Wrap it around your base circle for example and read off degrees
at the appropriate intervals.
Obviously if you have access to a few power tools you can do
an even better job. IE cut an exact circumference disk to
match, say, the tape measure blade with 360mm...gives you
nice 1 degree accuracy.....720mm gives you half degree accuracy etc.
Same for the Alt bearing. You could attach a similar disk to the hub
and read off sub-degree alt measurements...
My first GEM setting circles were made this way.
Steve
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