HEIDENHAIN TNC 620 User Manual page 190

5
Programming: Tools
5.2 Tool data
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 entry 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
NC block in
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.
Prerequisites for NC blocks with surface-normal vectors and
3-D compensation
The active radius (R + DR) of the replacement tool must not differ
from the radius of the original tool. You can enter the delta values
(DR) either in the tool table or in the TOOL CALL block. If there
are any deviations, the TNC displays an error message and does
not replace the tool. You can suppress this message with the M
function M107, and reactivate it with M108.
Further Information:
9), page 462
190
BT = 10 : Average machining time of an
seconds. Round up to the next odd
Three-dimensional tool compensation (option
HEIDENHAIN | TNC 620 | Conversational Programming User's Manual | 10/2015