Recording a teach-in cut, H-in step ("recording a teach-in cut – HEIDENHAIN TNC 640 (34059x-05) ISO programming User Manual

Page 388

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Programming: Special functions

11.3

Adaptive feed control AFC (Option #45)

388

TNC 640 | User's ManualDIN/ISO 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>.I.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>.I.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>.I.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 386, the TNC saves the following additional information in the

<name>.I.AFC.DEP file:

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