Why use a Y axis?
On the face of the part there isn’t any reason to use the Y
axis in theory. The machine with a G101 map could very easily
hit every angle, and cut every feature. However Angular
accuracy is decreased as the machine gets further away from
the center of rotation.
The Y axis is a True linear move, and will cut a true flat and
will help eliminate angular inaccuracies.
The C axis with the G101 map will cut a flat surface,
however it is polar interpolation and may not be as flat as a
surface cut with the linear Y axis in the G103 map. The
inaccuracy from the G101 map will be very small and in some
instances very difficult to measure.
If the work is small, smaller than 2 inches, and the tool will
be traveling close to center it may be best to use the G103 map
so the C axis isn’t rotating around as much. This really is
personal preference.
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