Defining The Workpiece Blank: Blk Form - HEIDENHAIN TNC 620 User Manual

Fundamentals | Creating and entering NC programs

Defining the workpiece blank: BLK FORM

Immediately after creating a new NC program, you define an
unmachined workpiece blank. If you wish to define the blank at a
later stage, then press the SPEC FCT key, the PROGRAM DEFAULTS
soft key, and then the BLK FORM soft key. The control needs this
definition for its graphical simulations.
You only need to define the workpiece blank if you
wish to run a graphic test for the NC program.
In order for the control to show the workpiece blank
in the simulation, the workpiece blank must have
minimum dimensions. The minimum dimensions are
0.1 mm or 0.004 inches in all axes as well as in the
radius.
The Advanced checks function in the simulation uses
the information from the workpiece blank definition
for workpiece monitoring. The control can monitor
only the active workpiece blank, even if several
workpieces are clamped in the machine!
Further information: User's Manual for Setup, Testing
and Running NC Programs
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
Load STL file as workpiece blank
Optionally load an additional STL file as finished
part
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
1 BLK FORM 0.1 Z X+0 Y+0 Z-40
2 BLK FORM 0.2 X+100 Y+100 Z+0
3 END PGM NEW MM
HEIDENHAIN | TNC 620 | Klartext Programming User's Manual | 01/2022
Program beginning, name, unit of measure
Spindle axis, MIN point coordinates
MAX point coordinates
Program end, name, unit of measure
3
91