Feed Rate Factor For Plunging Movements: M103 - HEIDENHAIN TNC 640 User Manual

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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.
...
N170 G01 G41 X+20 Y+20 F500 M103 F20*
N180 Y+50*
N190 G91 Z-2.5*
N200 Y+5 Z-5*
N210 X+50*
N220 G90 Z+5*
466
Miscellaneous Functions | Miscellaneous functions for path behavior
Actual contouring feed rate (mm/min):
500
500
100
141
500
500
HEIDENHAIN | TNC 640 | ISO Programming User's Manual | 10/2017