HEIDENHAIN TNC 426 (280 476) - Manual (Page 136)

HEIDENHAIN TNC 426, TNC 430 109
5.2 T
ool D
a
ta
Manual tool change
To change the tool manually, stop the spindle and move the tool to the
tool change position:
7 7 7 7 Move to the tool change position under program control.
7 7 7 7 Interrupt program run, see “Interrupting machining,” page 409
7 7 7 7 Change the tool.
7 7 7 7 Resume the program run, see “Resuming program run after an
interruption,” page 411
Automatic tool change
If your machine tool has automatic tool changing capability, the
program run is not interrupted. When the TNC reaches a TOOL CALL, it
replaces the inserted tool by another from the tool magazine.
Automatic tool change if the tool life expires: M101
The TNC automatically changes the tool if the tool life TIME2 expires
during program run. To use this miscellaneous function, activate M101
at the beginning of the program. M101 is reset with M102.
The tool is not always changed immediately, but, depending on the
workload of the control, a few NC blocks later.
Prerequisites for standard NC blocks with radius compensation
R0, RR, RL
The radius of the replacement tool must be the same as that of the
original tool. If the radii are not equal, the TNC displays an error
message and does not replace the tool.
Prerequisites for NC blocks with surface-normal vectors and 3-D
compensation
See “Three-Dimensional Tool Compensation,” page 114The radius of
the replacement tool can differ from the radius of the original tool. The
tool radius is not included in program blocks transmitted from CAD
systems. You can enter the delta value (DR) either in the tool table or
in the TOOL CALL block.
If DR is positive, 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 function of M101 can vary depending on the individual
machine tool. The machine tool manual provides further
information.