HEIDENHAIN TNC 640 - Page 534

Special Functions | Global Program Settings (option 44)
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
Operating notes:
In the fillable form the control grays out any axes that
are not active on your machine.
Entered values (e.g. offset values or values for
Handwheel superimp.:) are defined in the unit
of measure (mm or inch) selected in the position
display. Angles are always entered in degrees.
If you want to use Handwheel superimp.: while
machining with Dynamic Collision Monitoring
(DCM), then the control must be in a stopped or
interrupted state.
Further information: "General status display",
page 98
As an alternative, you can deactivate Dynamic
Collision Monitoring (DCM).
Further information: "Activating and deactivating
collision monitoring", page 512
Control display
Both methods for Handwheel superimp.: have an effect on the
actual position display.
The general status display shows the following icons:
No icon is displayed for the M118 function in the
NC program!
Handwheel superimp.: function active (default icon
of the Global Program Settings function)
The control displays the values of the two methods for
Handwheel superimp.: on the POS HR tab of the additional
status display.
Virtual axis VT
You can execute Handwheel superimp.: also in the currently active
tool axis direction. Here, the current tool axis is the virtual axis VT,
which does not correspond to the original tool axis direction Z. For
activating this function, the VT (Virtual Tool axis) line is available in
the form.
Values traversed with the handwheel in a virtual axis remain active
in the default setting (check box unchecked) even after a tool
change. The Reset VT value function allows you to change this
behavior.
The virtual axis VT is frequently needed for machining operations
with inclined tools, e.g. for manufacturing oblique holes without
using a tilted working plane.
Handwheel superimp.: in virtual axis direction VT
requires neither one of the PLANE functions nor the
TCPM function.