HEIDENHAIN CNC Pilot 4290 V7.1 Description of B and Y axes - Manual (Page 40)

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.7 DIN PLUS: W
o
rk
ing Planes
1.7 DIN PLUS: Working Planes
When programming drilling or milling operations with the Y axis, you
need to define the working plane.
If no working plane is programmed, the CNC PILOT assumes a turning
operation or a milling operation with the C axis (G18 XZ plane).
As of software version 625 952-05: At the end of a machining program
(M30, M99) the working plane is reset to G18.
G17 XY plane (front or back)
Milling cycles are executed in the XY plane, with the depth feed for
milling and drilling cycles in the Z direction.
G18 XZ plane (turning)
In the XZ plane, “normal turning operations” as well as drilling and
milling operations are executed with the C axis.
G19 YZ plane (side view/surface)
Milling cycles are executed in the YZ plane, with the depth feed for
milling and drilling cycles in the X direction.