HEIDENHAIN iTNC 530 (340 422) ISO programming - Manual (Page 203)

HEIDENHAIN iTNC 530 203
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Example NC blocks
The feed rate for plunging is to be 20% of the feed rate in the plane.
Feed rate in millimeters per spindle revolution:
M136
Standard behavior
The TNC moves the tool at the programmed feed rate F in mm/min.
Behavior with M136
With M136, the TNC does not move the tool in mm/min, but rather at
the programmed feed rate F in millimeters per spindle revolution. If
you change the spindle speed by using the spindle override, the TNC
changes the feed rate accordingly.
Effect
M136 becomes effective at the start of block.
You can cancel M136 by programming M137.
... Actual contouring feed rate (mm/min):
N107 G01 G41 X+20 Y+20 F500 M103 F20 * 500
N180 Y+50 * 500
N190 G91 Z–2.5 * 100
N200 Y+5 Z–5 * 141
N210 X+50 * 500
N220 G90 Z+5 * 500