HEIDENHAIN TNC 128 (77184x-02) - Manual (Page 84)

Programming: Fundamentals, file management
3.2 Opening and entering programs
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TNC 128 | User's Manual HEIDENHAIN Conversational Programming | 5/2014
3.2 Opening and entering 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 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
Movements, 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!
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