
7. COORDINATE SYSTEMS
B–63502EN/01
NC FUNCTION
64
Set the reference point on the tool holder or turret as shown in the figure
below, then specify G92 at the beginning of the program. By specifying
an absolute command in this condition, the reference point is moved to
a specified position. To move the tool tip to a specified position,
compensate the distance between the reference point and the tool tip by
using tool length compensation (for the M system) or tool offset (for the
T system).
Z
700.0
φ1200.0
X
600.0
1200.0
0
G92 600.0 Z1200.0 ;
Setting the start point at a given
reference point on the tool hold-
er
Reference
point
G92 1200.0Z700.0 ;
(diameter programming)
Setting the start point at a given reference
point on the turret
Start point
= reference
position
T seriesM series
When a new workpiece coordinate system is created by specifying G92,
it is determined so that a given point on the tool has a given coordinate
value. So, there is no need to be concerned with old workpiece coordinate
systems. Particularly when the start point for machining is determined
based on the workpiece, the G92 command is useful. In this case, a desired
coordinate system can newly be created even if an old workpiece
coordinate system is invalid.
A workpiece coordinate system can be shifted by using the following
command:
When this command is specified, a new coordinate system is created so
that the current coordinate value (x, z) at a given point on the tool (for
example, the tool tip) becomes (x+u, z+w).
For the x and u values, diameters must be set if diameter programming
is specified, or radii must be set if radius programming is specified.
(G91) G92 X(u) Z(w) ;
With G code system A: G50U(u)W(w);
D Example 2
D Example 3
(Shift of a workpiece
coordinate system)
T series
Format