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This is an explanation of our 4 axis milling center with a rotary table.

The C-axis control the rotation of the table. The direction of motion is defined by the sign of the C value. Since the table rotates the workpiece, the table must rotate clockwise to achieve a counterclockwise tool motion and vice versa.

C+ = Counterclockwise workpiece rotation (viewing in the Z+ direction).
C- = Clockwise workpiece rotation.

G90 Absolute Mode

In the absolute mode (G90), the C-word value defines the final position between
0 and 360. The + or - signs define the direction of rotation. The + sign causes
counterclockwise workpiece rotation, the - sign causes the clockwise rotation to
the indicated degree. There are two possible ways to get to a position on the
rotary table in absolute: by rotating either from the positive or negative
direction.

G91 Incremental Mode

In the incremental mode (G91), the C axis value defines the direction and
number of degrees to rotate. A C+90, causes the workpiece to rotate
counterclockwise 90 degrees. If the next move were a C-90, the workpiece
would rotate clockwise to the original position.

For G00 and G01 only

The C-axis in this machine will work in conjunction with linear moves (G00 and G01) only.
Arcs (G02 and G03) will not work with the C-axis.

Program Example