HEIDENHAIN TNC 640 User Manual page 529

Special Functions | Global Program Settings (option 44)
Control display
Like a shift in the NC program, the Mirroring (W-CS) of the
Global Program Settings function has no effect on the actual
position display.
The general status display shows the following icons:
Mirroring in the NC program active
Mirroring (W-CS) function active (default icon of the
Global Program Settings function)
The values Mirroring (W-CS) values are displayed on the GS tab
of the additional status display, the values from the NC program
on the TRANS tab.
Application example
Mirroring the CAM output:
CAM output for right mirror cap
The workpiece datum is centered on the workpiece blank
NC program set to the center of the ball-nose cutter and TCPM
function with spatial angles
The left mirror cap is to be machined (X axis mirroring)
Open the Global Program Settings function
Activate Mirroring (W-CS) with marked X
Run the NC program
The control takes the Mirroring (W-CS) value for the X axis and
the required rotary axes into account.
Shift (mW-CS)
Refer to your machine manual.
Your machine tool builder can also disable individual
settings possibilities within the Global Program Settings
function.
The Shift (mW-CS) option of the Global Program Settings function
provides a coordinate transformation in the mW-CS (modified
workpiece coordinate system).
The W-CS workpiece coordinate system is modified with active
Shift (W-CS) or active Mirroring (W-CS). Without this preceding
coordinate transformation, the Shift (mW-CS) option would be
effective directly in the W-CS workpiece coordinate system and
would thus be identical to Shift (W-CS).
Further information: "Workpiece coordinate system W-CS",
page 151
The Shift (mW-CS) option in the Global Program Settings function
takes effect on an axis-by-axis basis. The value is added to the shift
that takes place before the machining plane is tilted as defined in
the NC program (e.g. Cycle 7 DATUM SHIFT), the same way as it is
done for an active Shift (W-CS).
HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
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