HEIDENHAIN iTNC 530 (340 422) - Manual (Page 110)

110 4 Fundamentals of NC, File Management, Programming Aids, Pallet Management
4.5 Cr
eating and W
riting Pr
ogr
a
ms
4.5 Creating and Writing Programs
Organization of an NC program in HEIDENHAIN
conversational 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 BEGIN PGM, the program
name and the active unit of measure.
The subsequent blocks contain information on:
„ The workpiece blank
„ Tool definitions, tool calls
„ Feed rates and spindle speeds, as well as
„ Path contours, cycles and other functions
The last block of a program is identified by END PGM, the program name
and the active unit of measure.
Defining the blank form –
BLK FORM
Immediately after initiating a new program, you define a cuboid
workpiece blank. If you wish to define the blank at a later stage, press
the BLK FORM soft key. 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 can be up to 100 000 mm long. The blank
form 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.
10 L X+10 Y+5 R0 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!