HEIDENHAIN TNC 410 ISO Programming - Manual (Page 97)

HEIDENHAIN TNC 410, TNC 426, TNC 430 71
4.6 Cr
eating
and
W
riting
Pr
ogr
ams
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 numbers the blocks in ascending sequence.
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:
n The workpiece blank
n Tool definitions, tool calls
n Feed rates and spindle speeds, as well as
n
Path contours, cycles and other functions
The last block of a program is identified by N999999, %, the program
name and the active unit of measure (G70/G71).
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 lie parallel to the
X, Y and Z axes and may be up to 100 000 mm long (TNC 410: 30 000
mm). The blank form is defined by two of its corner points:
n
MIN point G30: the smallest X, Y and Z coordinates of the blank
form, entered as absolute values.
n MAX point G31: the largest X, Y and Z coordinates of the blank form,
entered as absolute or incremental values (with G91).
N10 G00 G40 X+10 Y+5 F100 M3
Block number
Path function Words
Blocks
You only need to define the blank form if you wish to run
a graphic test for the program!
The TNC can display the graphic only if the ratio of the
shortest to the longest side of the blank form is less than
1 : 64.