HEIDENHAIN TNC 640 (34059x-05) - Manual (Page 101)

Opening programs and entering 3.2
3
TNC 640 | User's Manual
HEIDENHAIN Conversational Programming | 1/2015
101
3.2 Opening programs and entering
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 of a part program 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 calls
Approaching a safe position
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.
After each tool call, HEIDENHAIN recommends
always traversing to a safe position from which the
TNC can position the tool for machining without
causing a collision!
Block number
Path functions Words
Block