HEIDENHAIN ITNC 530 - CONVERSATIONAL PROGRAMMING User Manual page 412

11.6 Adaptive Feed Control
Software Option (AFC)
Application
The AFC feature must be enabled and adapted by the
machine tool builder. Refer to your machine tool manual.
Your machine tool builder may also have specified
whether the TNC uses the spindle power or any other
value as the input value for the feed control.
Adaptive feed control is not intended for tools with
diameters less than 5 mm. This limit diameter might also
be greater if the spindle's rated power is very high.
Do not work with adaptive feed control in operations in
which the feed rate and spindle speed must be adapted to
each other, such as tapping.
In adaptive feed control the TNC automatically controls the feed rate
during program run as a function of the current spindle power
consumption. The spindle power required for each machining step is
to be recorded in a teach-in cut and saved by the TNC in a file
belonging to the part program. When each machining step is started,
which is normally when the spindle is switched on with M3, the TNC
controls the feed rate so that it remains within the limits that you have
defined.
This makes it possible to avoid negative effects on the tool, the
workpiece, and the machine that might be caused by changing cutting
conditions. Cutting conditions are changed particularly by:
Tool wear
Fluctuating cutting depths that occur especially with cast parts
Fluctuating hardness caused by material flaws
412 Programming: Special Functions