HEIDENHAIN TNC 620 (340 56x-01) - Manual (Page 462)

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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.
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 time that the TNC calculates from the duration
of tool movements. The time calculated by the TNC can only
conditionally be used for calculating the production time because the
TNC does not account for the duration of machine-dependent
interruptions, such as tool change.
Activating the stopwatch function
Shift the soft-key rows until the TNC displays the following soft keys
with the stopwatch functions:
Function Soft key
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 BLANK FORM soft key the TNC
returns the graphic of the workpiece blank to its originally
programmed dimensions.
Stopwatch functions Soft key
Store displayed time
Display the sum of stored time
and displayed time
Clear displayed time