Recording a teach-in cut – HEIDENHAIN TNC 640 (34059x-05) User Manual

Page 404

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Programming: Special functions

11.3

Adaptive feed control AFC (Option #45)

404

TNC 640 | User's Manual

HEIDENHAIN Conversational Programming | 1/2015

Recording a teach-in cut

The TNC provides several cycles that enable you to start and stop a
teach-in step:

FUNCTION AFC CTRL: The AFC CTRL function activates closed-
loop mode starting with the place at which this block is run
(even if the teach-in phase has not yet been completed)
FUNCTION AFC CUT BEGIN TIME1 DIST2 LOAD3: The TNC
starts a sequence of cuts with active AFC. The switch from
the teach-in cut to closed-loop mode begins as soon as the
reference load was determined in the teach-in phase, or once
one of the conditions TIME, DIST or LOAD is fulfilled. With
TIME you define the maximum duration in seconds of the teach-
in phase. DIST defines the maximum distance for the teach-in
cut. With LOAD you can set a reference load directly.
FUNCTION AFC CUT END: The AFC CUT END function
deactivates the AFC control

The defaults TIME, DIST and LOAD are modally
effective. They can be reset with the entry 0.

Programming AFC

To program the AFC functions for starting and ending the teach in
cut, proceed as follows:

In the

Programming mode, press the SPEC FCT key

Select the

PROGRAM FUNCTIONS soft key

Select the

FUNCTION AFC soft key

Select the function

With a teach-in cut the TNC firstly copies the basic settings defined
in the AFC.TAB table into the file

<name>.H.AFC.DEP for each

machining step.

<name> is the name of the NC program for which

you have recorded the teach-in cut. In addition, the TNC measures
the maximum spindle power consumed during the teach-in cut and
saves this value in the table.
Each line in the

<name>.H.AFC.DEP file stands for a machining

section, that you start with

FUNCTION AFC CUT BEGIN and

complete with

FUNCTION AFC CUT END. You can edit all data

of the

<name>.H.AFC.DEP file if you wish to optimize them. If

you have optimized the values in comparison with the values
in the AFC.TAB table, the TNC places an asterisk

* in front

of the control settings in the AFC column. Besides the data
from the AFC.TAB table see "Defining the AFC basic settings",
page 402, the TNC saves the following additional information in the
<name>.H.AFC.DEP file:

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