The positional relation between these two coordinate systems is
determined when a workpiece is set on the table.
Coordinate system spe-
cified by the CNC estab-
lished on the table
Coordinate system on
part drawing estab-
lished on the work-
Fig. 1.3.2 (c) Coordinate system specified by CNC and coordinate
systemon part drawing
The tool moves on the coordinate system specified by the CNC in
accordance with the command program generated with respect to the
coordinate system on the part drawing, and cuts a workpiece into a shape
on the drawing.
Therefore, in order to correctly cut the workpiece as specified on the
drawing, the two coordinate systems must be set at the same position.
To set the two coordinate systems at the same position, simple methods
shall be used according to workpiece shape, the number of machinings.
(1)Using a standard plane and point of the workpiece.
Bring the tool center to the workpiece standard point.
And set the coordinate system specified by CNC at this position.
D Methods of setting the
two coordinate systems
in the same position