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Okuma America Corporation
MACHINE DEFINITIONMACHINE DEFINITION
MACHINE DEFINITIONMACHINE DEFINITION
MACHINE DEFINITION
Rev. 8-21-01
MACHINING CENTERMACHINING CENTER
MACHINING CENTERMACHINING CENTER
MACHINING CENTER
A machining center is an NC machine that can perform milling, drilling, boring, and tapping
operations. On machining centers, the rotating tool machines the workpiece as it moves
across the face of the tool. The workpiece moves due to the movement of the table. The
rotational axis is perpendicular to the table on vertical machining centers and parallel to the
table on horizontal machining centers. The origin of the coordinate system is the center of
the table.
Figure 3-2 shows the axis nomenclature for the vertical machining center. The X axis is the
table longitudinal movement and is positive when fed left. The Y axis is the saddle cross-
wise movement and is positive when fed towards the operator. The Z axis is the spindle head
vertical movement and is positive when fed upward.
Figure 3-3 shows the axis nomenclature for the horizontal machining center. The X axis is
the table longitudinal movement and is positive when fed right. The Y axis is the spindle
head vertical movement and is positive when fed upward. The Z axis is the saddle crosswise
movement and is positive when fed towards the operator. The rotating motion of a rotary
table is positive when fed clockwise.
Fig. 3-4 shows the axis nomenclature for the traveling column type machining center. Fig. 3-
5 shows the axis nomenclature for the double column type machining center.
VERVER
VERVER
VER
TICAL MACHINING CENTERTICAL MACHINING CENTER
TICAL MACHINING CENTERTICAL MACHINING CENTER
TICAL MACHINING CENTER
X axis: Longitudinal movement of the table (positive when fed to the left)
Y axis: Crosswise movement of saddle (positive when fed toward the operator)
Z axis: Vertical movement of Spindlehead (positive when fed upward)
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