HEIDENHAIN TNC 426 B User Manual page 303

Repeating graphic simulation
A part program can be graphically simulated as often as desired,
either with the complete workpiece or with a detail of it.
Function
Restore workpiece blank to the detail
magnification in which it was last shown
Reset detail magnification so that the machined
workpiece or workpiece blank is displayed as it
was programmed with BLK FORM
With the WINDOW BLK FORM soft key, you return the
displayed workpiece blank to its originally programmed
dimensions, even after isolating a detail - without
TRANSFER DETAIL.
Measuring the machining time
Program run modes of operation
The timer counts and displays the time from program start to
program end. The timer stops whenever machining is interrupted.
Test run
The timer displays the approximate time which the TNC calculates
from the duration of tool movements. The time calculated by the
TNC cannot be used for calculating the production time because
the TNC does not account for the duration of machine-dependent
interruptions, such as tool change.
To activate the stopwatch function
Shift the soft-key rows until the TNC displays the following soft keys
with the stopwatch functions:
Stopwatch functions
Store displayed time
Display the sum of stored time
and displayed time
Clear displayed time
The soft keys available to the left of the stopwatch
functions depend on the selected screen layout.
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Soft key
Soft key
11 Test Run and Program Run