HEIDENHAIN TNC 620 (81760x-02) - Manual (Page 100)

Programming: Fundamentals, file management
3.2 Opening programs and entering
3
100
TNC 620 | User's Manual
HEIDENHAIN Conversational Programming | 2/2015
Define 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 soft key, and then the
BLK FORM soft key. The TNC 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 TNC can depict various types of blank forms.
Soft key Function
Define a rectangular blank
Define a cylindrical blank
Define a rotationally symmetric blank
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: Display the BLK FORM in the NC program
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
Cylindrical blank
The cylindrical blank form is defined by the dimensions of the
cylinder:
Rotation axis X, Y or Z
R: Radius of the cylinder (with positive sign)
L: Length of the cylinder (with positive sign)
DIST: Shifting along the rotational axis
RI: Inside radius for a hollow cylinder
The DIST and RI parameters are optional and do not
need to be programmed.