HEIDENHAIN TNC 410 ISO Programming - Manual (Page 185)

HEIDENHAIN TNC 410, TNC 426, TNC 430 159
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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 (not TNC 410)
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
With the introduction of software 280 476-xx, the unit of
measure used for miscellaneous function M136 has
changed from µm/rev. to mm/rev. If you are using
programs in which you have programmed M136 and
which you have written on a previous TNC software, you
need to reduce the value entered for the feed rate by the
factor 1000.