
3.DESCRIPTION OF COORDINATE OPERATION B-63344EN/02
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3.2 WORKPIECE COORDINATE SYSTEM
The machine coordinate system previously mentioned is peculiar to a
specific machine. It is determined uniquely regardless of
theworkpieces and tools used.
Another coordinate system is required for each tool to prevent
programmed positions from changing between tools because of the
difference in tool dimensions. This coordinate system must be set
with respect to the dimensions of a specific tool. Such coordinate
systems are called Workpiece Coordinate System.
A workpiece coordinate system is determined using the Tool
Geometry Offset. For details of it, refer to the CNC Operator’s
Manual.
The origin of the workpiece coordinate system is set on the end face
of workpiece always in MANUAL GUIDE.
In the following sample drawing, OFS
X
and OFS
Z
means the distance
with sigh between 2 points, 1st is the position at the tool post is at the
machine zero point, 2nd is the position at the imaginary nose is at the
center of the end face of the workpiece (origin of the workpiece
coordinate). These distance data are set into the geometry offset
amount.
Spindle
Chuck
Workpiece
OFS
X
OFS
Z
Imaginary nose
Machine
zero point
+Z
Origin of the Workpiece
Coordinate
+X