HEIDENHAIN TNC 620 User Manual page 569

Example
The power failed while a thread cutting cycle in the tilted working
plane was being performed. You have to retract the tap:
Switch on the power supply for control and machine. The TNC
starts the operating system. This process may take several
minutes. Then the TNC will display the message "Power
interrupted" in the screen header
Activate the Retraction mode: Press the RETRACT
soft key. The TNC displays the message RETRACT
Acknowledge the power interruption: Press the CE
key. The TNC compiles the PLC program.
Switch on machine control voltage: The TNC
checks the emergency stop switch. If at least one
axis is not referenced, then you must compare
the displayed position values with the actual
axis values and confirm a match and follow any
instructions given in the dialog.
Check the preselected traverse mode: If required, select
THREAD
Check the preselected thread pitch: If required, enter the thread
pitch
Check the pre-selected rotation direction: if necessary select
the direction of rotation of the thread
Right-handed thread: The spindle turns in clockwise direction
when moving into the workpiece and counterclockwise
when retracting Left-handed thread: The spindle turns in
counterclockwise direction when moving into the workpiece
and clockwise when retracting
Activate retraction: Press the RETRACT soft key
Retraction: Retract the tool with the axis direction keys or the
electronic handwheel
Axis key Z+: Retraction from the workpiece
Axis key Z-: Moving into the workpiece
Exit retraction: Return to the original soft-key level
End the Retraction mode: Press the END
RETRACTION soft key. The TNC checks whether
the Retract mode can be exited, following any
instructions given in the dialog
Answer the confirmation request: If the tool was not correctly
retracted, press the NO soft key. If the tool was correctly
retracted, press the YES soft key. The TNC hides the Retraction
Selected dialog.
Initialize the machine: if required, cross the datums
Establish the desired machine condition: If required, reset the
tilted working plane
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2015
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