HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 75)

59 HEIDENHAIN TNC 410, TNC 426, TNC 430
4.6 Creating and Writing Programs
Organization of an NC program in ISO format.
A part program consists of a series of program blocks. The figure at
right illustrates the elements of a block.
The TNC automatically numbers the program blocks in ascending
sequence, if you have set a block number increment in MP7220
(see „14.1 General User Parameters“)
The first block of a program is identified by “%” the program name
and the active unit of measure G70/G71.
The subsequent blocks contain information on:
■ The blank form:
■ Tool definitions and tool calls,
■ Feed rates and spindle speeds as well as
■ Path contours, cycles and other functions
The last block of a program begins with N999 999 and is identified
with ”%”, the program name and the active unit of measure.
Define blank form: G30/G31
Immediately after initiating a new program, you define a cuboid
workpiece blank. This definition is needed for the TNC’s graphic
simulation feature. The sides of the workpiece blank may be max.
100 000 mm long (TNC 410: 30 000 mm) and lie parallel to the axes
X, Y and Z. The ratio of the side lengths must be less than 200:1. The
blank form 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.
You only need to define the blank form if you wish to run
a graphic test for the program!
Block:
N100 G00 G40 X+10 Y+5 M3
Path function Words
Block number
Y
X
Z
MAX
MIN
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