
16.COORDINATE SYSTEM CONVERSION FUNCTION NC FUNCTIONS B-63782EN/01
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In three-dimensional coordinate conversion mode, the following two
types of manual interruption are supported:
(1) Operation in a workpiece coordinate system (with three-
dimensional coordinate conversion not applied)
(2) Operation in a program coordinate system (with three-dimensional
coordinate conversion applied)
- Three-dimensional rigid tapping
Rigid tapping in three-dimensional coordinate conversion mode
enables three-dimensional rigid tapping.
- Coordinate system during three-dimensional coordinate conversion
Format
G68 Xp x
1
Yp y
1
Zp z
1
I i
1
J j
1
K k
1
Rα
αα
α ; Starting three-dimensional coordinate conversion
G68 Xp x
2
Yp y
2
Zp z
2
I i
2
J j
2
K k
2
Rβ
ββ
β ; Second three-dimensional coordinate conversion
: Three-dimensional coordinate conversion mode
:
G69 ; Canceling three-dimensional coordinate conversion
Symbol
Xp, Yp, Zp : Center of rotation (absolute coordinates) on the X, Y, and Z axis or parallel axes
I, J, K : Direction of the axis of rotation
R : Angular displacement
The above command places the machine in three-dimensional
coordinate conversion mode. The following coordinate systems are
used in three-dimensional coordinate conversion mode.
Coordinate system definition
Coordinate system X, Y, Z :
Original workpiece coordinate system
Coordinate system X', Y', Z' :
Coordinate system after the first coordinate conversion
N1 specifies the rotation center, rotation center axis
direction, and angular displacement of the first rotation. As
a result of the first rotation, coordinate system X', Y', and Z'
is produced which has its center shifted by (x1,y1,z1) with
respect to the original workpiece coordinate system, and is
rotated about (i1,j1,k1) by α.
Coordinate system X", Y", Z" : Program coordinate system
N2 specifies the rotation center, rotation center axis
direction, and angular displacement of the second rotation.
As a result of the second rotation, coordinate system X", Y",
and Z" is produced which has its center shifted by (x2,y2,z2)
with respect to coordinate system X', Y', Z', and is rotated
about (i2,j2,k2) by β
Note that Xp, Yp, Zp, I, J, K, and R in N2 are the coordinates
and angle in the coordinate system produced by conversion
by N1.
Programmed values Xp, Yp, and Zp in N3 are regarded as being the
coordinates in program coordinate system X", Y", and Z".