HEIDENHAIN TNC 640 User Manual page 240

7
Fixed Cycles: Contour Pocket | CONTOUR TRAIN (Cycle 25, DIN/ISO: G125)
Q18 Coarse roughing tool? or QS18: Number or
name of the tool with which the TNC has already
coarse-roughed the contour. You are able to apply
the coarse roughing tool via soft key directly
from the tool table. In addition, you can enter
the tool name via the soft key tool name. The
TNC automatically inserts the closing quotation
mark when you exit the input field. If there was
no coarse roughing, enter "0"; if you enter a
number or a name, the TNC will only rough-
out the portion that could not be machined with
the coarse roughing tool. If the portion that is
to be roughed cannot be approached from the
side, the TNC will mill in a reciprocating plunge-
cut; for this purpose you must enter the tool
length LCUTS in the tool table TOOL.T and define
the maximum plunging ANGLE of the tool. The
TNC will otherwise generate an error message.
Input range 0 to 99999 if a number is entered;
maximum 16 characters if a name is entered.
Q446 Accepted residual material? Define to
which value in mm you accept residual material on
your contour. If you enter 0.01 mm for example,
the TNC no longer performs machining of residual
material from a residual material thickness of 0.01
mm. Input range 0.001 to 9.999
Q447 Maximum connection distance? Maximum
distance between two areas to be fine roughed.
Within this distance the TNC traverses without a
lifting movement along the contour at machining
depth. Input range 0 to 999.999
Q448 Path extension? Length by which the
tool path is extended at the start and end of the
contour. The TNC always extends the tool path
parallel to the contour. Input range 0 to 99.999
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HEIDENHAIN | User's manual for cycle programming | 10/2017