HEIDENHAIN TNC 320 (77185x-01) - Manual (Page 173)

Tool data 5.2
5
TNC 320 | User's Manual
HEIDENHAIN Conversational Programming | 3/2014
173
Enter the respective tool life after which machining is to be
continued with a replacement tool in the
TIME2 column of the tool
table. In the CUR_TIME column the TNC enters the current tool life.
If the current tool life is higher than the value entered in the TIME2
column, a replacement tool will be inserted at the next possible
point in the program no later than one minute after expiration of
the tool life. The change is made only after the NC block has been
completed.
The TNC performs the automatic tool change at a suitable point in
the program. The automatic tool change is not performed:
During execution of machining cycles
While radius compensation is active (
RR/RL)
Directly after an approach function APPR
Directly before a departure function DEP
Directly before and after CHF and RND
During execution of macros
During execution of a tool change
Directly after a
TOOL CALL or TOOL DEF
During execution of SL cycles
Caution: Danger to the workpiece and tool!
Switch off the automatic tool change with M102 if
you are working with special tools (e.g. side mill
cutter) because the TNC at first always moves the
tool away from the workpiece in tool axis direction.
Depending on the NC program, the machining time can increase as
a result of the tool life verification and calculation of the automatic
tool change. You can influence this with the optional input element
BT (block tolerance)
If you enter the
M101 function, the TNC continues the dialog by
requesting the BT. Here you define the number of NC blocks (1
- 100) by which the automatic tool change may be delayed. The
resulting time period by which the tool change is delayed depends
on the content of the NC blocks (e.g. feed rate, path). If you do not
define
BT, the TNC uses the value 1 or, if applicable, a default value
defined by the machine manufacturer.
The more you increase the value of BT, the smaller
will be the effect of an extended program duration
through
M101. Please note that this will delay the
automatic tool change!
To calculate a suitable output value for
BT use the
formula BT = 10 : Average machining time of an
NC block in seconds . Round up to the next odd
integer. If the calculated result is greater than 100,
use the maximum input value of 100.
If you want to reset the current age of a tool (e.g.
after changing the indexable inserts), enter the value
0 in the CUR_TIME column.