HEIDENHAIN TNC 640, User Manual, Page: 488 / 948

Miscellaneous Functions | Miscellaneous functions for path behavior
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
Feed rate factor for plunging movements: M103
Standard behavior
The control moves the tool at the last programmed feed rate,
regardless of the direction of traverse.
Behavior with M103
The control reduces the feed rate when the tool moves in the
negative direction of the tool axis. The feed rate for plunging
FZMAX is calculated from the last programmed feed rate FPROG
and a factor F%:
FZMAX = FPROG x F%
Programming M103
If you program
M103
in a positioning block, the control continues
the dialog by prompting you for the F factor.
Effect
M103
becomes effective at the start of the block.
To cancel
M103
, program
M103
once again without a factor.
The
M103
is also effective with an active tilted working
plane coordinate system. The feed rate reduction is
then effective in the negative direction when moving the
tilted tool axis.
Example
The feed rate for plunging is to be 20% of the feed rate in the plane.
...
Actual contouring feed rate (mm/min):
17 L X+20 Y+20 RL F500 M103 F20
500
18 L Y+50
500
19 L IZ-2.5
100
20 L IY+5 IZ-5
141
21 L IX+50
500
22 L Z+5
500