
OPERATION
B–63534EN/02
11. SETTING AND DISPLAYING DATA
1063
Workpiece
Measurement
surface
OFSL Tool
01
OFSL Tool
T01
Hm
Zm
Zm
L
!Hm
Reference block
Base measure-
ment surface
L : Distance from the reference tool tip position to the base measurement surface (machine coordinate
of the measurement surface)
Hm : Distance from the base measurement surface to the actual measurement surface
Zm : Distance from the tip of the tool to be measured to the measurement surface when the tool is
positioned to the machine zero point
(Zt : Distance from the tip of the tool to be measured to the base measurement surface when the tool is
positioned to the machine zero point)
OFSL : Tool length offset value (OFSL = Zm – Hm – L)
Zt
Machine table Machine table
(Reference tool
tip position)
Machine zero
point
Measurement
surface
Defining the actual tool length as the tool length offset has the
advantage of eliminating the need for remeasuring, even if the
workpiece is changed, provided the tool is not worn. Another
advantage is that the tool length offset need not be re–set when
multiple workpieces are machined. In this case, assign a workpiece
coordinate system to each workpiece, using G54 to G59, and set the
workpiece origin offset for each workpiece. For an explanation of how
to measure the workpiece origin offset, see ”Measuring the workpiece
origin offset”, below.