HEIDENHAIN TNC 640, User Manual, Page: 493 / 948

Miscellaneous Functions | Miscellaneous functions for path behavior
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
493
Superimposing handwheel positioning during
program run: M118
Standard behavior
In the Program Run operating modes, the control moves the tool as
defined in the NC program.
Behavior with M118
M118
permits manual corrections by handwheel during the
program run. For this purpose, you program
M118
and enter an
axis-specific value (linear or rotary axis).
The
M118
handwheel superimpositioning function, in
combination with the
Dynamic Collision Monitoring
(DCM)
function, can only be used at a standstill.
The
M118
handwheel superimpositioning function
cannot be used in combination with the
Dynamic
Collision Monitoring (DCM)
function and the additional
TCPM
or
M128
function.
In order to use
M118
without restrictions, either
deselect the
Dynamic Collision Monitoring (DCM)
function using the soft key from the menu or activate a
kinematics operation without collision objects (CMOs).
NOTICE
Danger of collision!
If you use the
M118
function to modify the position of a
rotary axis with the handwheel and then execute the
M140
function, the control ignores the superimposed values with the
retraction movement. This results in unwanted and unpredictable
movements, especially when using machines with head rotation
axes. There is a danger of collision during these compensating
movements!
Do not combine
M118
with
M140
when using machines with
head rotation axes.
Input
If you enter
M118
in a positioning block, the control continues the
dialog for this block by prompting you for the axis-specific values.
The coordinates are entered with the orange axis direction buttons
or the ASCII keyboard.
Effect
To cancel handwheel positioning, program
M118
once again
without coordinate input.
M118
becomes effective at the start of the block.