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About the A-axis Coordinate
A-axis location
In actual cutting operations, consideration must also be given to the location of the A-axis center. When you're using the rotary
axis unit, instead of simply setting the origin to match the location of the workpiece, the origin location must be determined
with consideration also given to the location of the center around which the workpiece rotates. It is most common to align
the Y- and Z-axis origins with the center of the A axis, although this may vary according to the cutting method.
P. 42, "4-1 A Different Way of Thinking for the Y- and Z-axis Origins"
A-axis origin (0˚)
The location of the A axis is indicated as an angle of
rotation. In this way it differs from how the X, Y, and Z
axes are indicated.
A-axis center
Despite this difference between angles and distances,
in other respects it is treated the same as X-, Y-, and
Z-axis coordinates. As with any of the other axes, you
can freely set location of the origin (despite it being
an "angle" and not strictly a "point") and select the
coordinate system.
The unit of measurement used to indicate A-axis co-
ordinates is the degree, and this cannot be changed.
3-1 Moving the A Axis
A-axis coordinate
Chapter 3 Basic Operation
33
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