
B-63784EN-1/01 OPERATION 9.SETTING AND DISPLAYING DATA
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Description
- Definition of the tool length offset
The tool length offset can generally be defined in two methods, as
described below. The two methods share a single view that a tool
length offset is the distance between the tool tip of a target tool and the
tool tip of a reference tool.
(1) Method 1
The actual tool length is used as the tool length offset. In this
method, the reference tool is a virtual tool of which tip is on the
machine zero point when the machine is on the zero point on the
Z-axis of the machine coordinate system. The tool length offset is
the difference between the tool tip position of the target tool and
the tool tip position of the reference tool, or the distance along the
Z-axis between the machine zero point and the tool tip position of
the target tool when the machine is at the machine zero point of the
Z-axis.
When a tool length is measured, the tool is manually moved until
the tool tip comes into contact with the top surface of a workpiece
or reference block. This surface is referred to as the measurement
surface. This measurement surface cannot be the top surface of
the machine table because doing so would cause the machine to be
damaged. However, suppose that the top surface of the machine
table is used as the measurement surface. The distance between
the machine zero point and the top surface of the machine table is
a machine-specific value that is referred to as distance L. Given
that distance L is set in parameter 6024 and that the measurement
surface is the top surface of the machine table, tool length offset
OFSL can be easily obtained from L and the machine coordinates
Zt of the tool when the tool touches the top surface of the machine
table. Since the actual measurement surface cannot be the top
surface of the machine table, the top surface of the machine table
is defined as a reference measurement surface, and the distance
Referen
ce tool
(Tool tip position of
reference tool)
Machine zero point
OFSL03
OFSL02
OFSL01: Tool length offset of tool T01
OFSL02: Tool length offset of tool T02
OFSL03: Tool length offset of tool T03
OFSL01
Tool
T01
Tool
T02
Tool
T03