HEIDENHAIN TNC 640, User Manual, Page: 162 / 948

Fundamentals, File Management | Creating and writing programs
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HEIDENHAIN | TNC 640 | Conversational Programming User's Manual | 10/2017
Defining the blank: BLK FORM
Immediately after initiating a new program, you define an
unmachined workpiece blank. If you wish to define the blank at
a later stage, press the
SPEC FCT
key, the
PROGRAM DEFAULTS
soft key, and then the
BLK FORM
soft key. The control needs this
definition for graphic simulation.
You only need to define the workpiece blank if you wish
to run a graphic test for the program!
The control can depict various types of blank forms:
Soft key Function
Define a rectangular blank
Define a cylindrical blank
Define a rotationally symmetric blank of any
shape
Rectangular blank
The sides of the cuboid lie parallel to the X, Y and Z axes. This
blank is defined by two of its corner points:
MIN point: the smallest X, Y and Z coordinates of the blank
form, entered as absolute values.
MAX point: the largest X, Y and Z coordinates of the blank form,
entered as absolute or incremental values
Example
0 BEGIN PGM NEW MM
Program begin, name, unit of measure
1 BLK FORM 0.1 Z X+0 Y+0 Z-40
Spindle axis, MIN point coordinates
2 BLK FORM 0.2 X+100 Y+100 Z+0
MAX point coordinates
3 END PGM NEW MM
Program end, name, unit of measure