HEIDENHAIN TNC 620 (340 56x-02) - Manual (Page 304)

304 Programming: Miscellaneous Functions
9.4 Miscellaneous F
unctions f
o
r Cont
our
ing Beha
vior
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 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 enter M103 in a positioning block, the TNC continues the dialog
by asking you 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.
M103 is also effective in an active tilted working plane.
The feed rate reduction is then effective during traverse in
the negative direction of the tilted tool axis.
... 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