HEIDENHAIN TNC 410 - Manual (Page 127)

7 Programming: Miscellaneous Functions 114
Feed rate factor for plunging movements: M103
Standard behavior
The TNC moves the tool at the last programmed feed rate,
regardless of the direction of traverse.
Behavior with M103
The TNC reduces the feed rate when the tool moves in the negati-
ve direction of the tool axis (defined in machine parameter 7440).
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 press the soft key M103 in a positioning block (with the dialog
”Miscellaneous function?”), the TNC then continues the dialog by
asking you for the factor F.
Effect
M103 becomes effective at the start of block.
To cancel M103, program M103 once again without a factor.
Example NC blocks
The feed rate for plunging is to be 20% of the feed rate in the
plane.
...
17 L X+20 Y+20 RL F500 M103 F20
18 L Y+50
19 L IZ–2.5
20 L IY+5 IZ–5
21 L IX+50
22 L Z+5
Actual contouring feed rate (mm/min):
500
500
100
141
500
500
7.
4 Miscellaneous F
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