HEIDENHAIN TNC 620 (340 56x-03) - Manual (Page 153)

HEIDENHAIN TNC 620 153
5.2 T
ool D
a
ta
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.
Prerequisites for NC blocks with surface-normal vectors and 3-D
compensation
See "Three-Dimensional Tool Compensation (Software Option 2)" on
page 378. 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.
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!
If you want to reset the current life of a tool (e.g. after
changing the indexable inserts), enter the value 0 in the
CUR_TIME
column.
The M101 function is not available for turning tools and in
turning mode.