HEIDENHAIN TNC 426, User Manual

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HEIDENHAIN TNC 426, TNC 430 93
4.13 P
a
llet Oper
ation with T
ool-Or
ient
e
d Mac
h
ining
Sequence of tool-oriented machining
n
The entry TO or CTO in the Method field tells the TNC that the
oriented machining is valid beyond these lines.
n
The pallet management starts the NC program given in the line with
the entry TO.
n
The first workpiece is machined until the next tool call is pending.
Departure from the workpiece is coordinated by a special tool-
change macro.
n
The entry in the column W-STATE is changed from BLANK to
INCOMPLETE, and the TNC enters a hexadecimal value in the field
CTID.
n
All lines in the pallet file that contain the entry CTO in the Method
field are machined in the same manner as the first workpiece.
Workpieces in several fixtures can be machined.
n
The TNC uses the next tool for the following machining steps again
from the line with the entry TO if one of the following situations
applies:
n
If the entry PAL is in the PAL/PGM field in the next line.
n
If the entry TO or WPO is in the Method field in the next line.
n
If in the lines already machined there are entries under Method
which do not have the status EMPTY or ENDED.
n
The NC program is continued at the stored location based on the
value entered in the CTID field. Usually the tool is changed for the
first piece, but the TNC suppresses the tool change for the following
workpieces.
n
The entry in the CTID field is updated after every machining step. If
an END PGM or M02 is executed in an NC program, then an existing
entry is deleted and ENDED is entered in the Machining Status field.
The TNC only carries out tool-oriented machining if the
TOOL ORIENTED method was selected, and TO or CTO is
entered in the table.
The value entered in the field CTID is a unique identifier of
the machining progress for the TNC. If these value is
deleted or changed, machining cannot be continued, nor is
mid-program startup or resumption of machining possible.