
A-79344E
Title
Draw
No.
Ed. Date Design Description
Date Jan.06.’04 Design. Apprv.
6/24
page
FANUC Series 30i-MODEL A
Input of tool offset value measured B
Example 2
The measuring reference point may be an imaginary point (imaginary zero point), as shown
in the figure below. The difference between the imaginary zero point and the measuring tool
nose tip position at the mechanical reference point can be set as the tool offset value of the
measuring tool, by setting the distances from the imaginary zero point to the respective
contact faces in parameters.
+X
Measuring tool nose
position at the mechani
cal reference position
(0,0)
Zt
Zm
Zp
Xp
Xm
OFSx
OFSZ
Xt
+Z
Machine zero
point
Measuring reference position
(Imaginary zero point)
When the imaginary zero position is set as the measuring reference position
・Setting the workpiece coordinate system shift amount
The workpiece coordinate system shift amount for the Z-axis can be set as follows: Bring the
tool to touch the workpiece end face. Subtract the tool geometry offset value of the tool (the
value shifted in the coordinate system by the tool geometry offset) from the machine
coordinate value (the distance from the measuring tool nose tip position at the mechanical
reference position (machine zero point) to the workpiece end face).The result is set as the
workpiece coordinate system shift value.
(Z axis workpiece coordinate system shift amount to be set
(EXOFSz) )
= (Z axis tool geometry offset value of the corresponding tool
(OFSz)) – (Z axis machine coordinate value(Zt))
Using the above methods, the workpiece coordinate system is set with the workpiece end face
(the contact point of the sensor) specified as the programmed zero point of the workpiece
coordinate system of the Z-axis.