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Define the blank: g30/g31 – HEIDENHAIN TNC 320 (77185x-01) ISO programming User Manual

Page 88

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Programming: Fundamentals, file management

3.2

Opening programs and entering

3

88

TNC 320 | User's Manual for DIN/ISO Programming | 3/2014

Define the blank: G30/G31

Immediately after initiating a new program, you define a cuboid,

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 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 workpiece 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 G30: the smallest X, Y and Z coordinates of the blank

form, entered as absolute values
MAX point G31: 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

%NEW G71 *

Program begin, name, unit of measure

N10 G30 G17 X+0 Y+0 Z-40 *

Spindle axis, MIN point coordinates

N20 G31 X+100 Y+100 Z+0 *

MAX point coordinates

N99999999 %NEW G71 *

Program end, name, unit of measure