HEIDENHAIN TNC 620 (73498x-01) ISO programming - Manual (Page 39)

HEIDENHAIN TNC 620 39
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Program layout
NC programs should be arranged consistently in a similar manner. This
makes it easier to find your place and reduces errors.
Recommended program layout for simple, conventional contour
machining
1 Call tool, define tool axis
2 Retract the tool
3 Pre-position the tool in the working plane near the contour starting
point
4 In the tool axis, position the tool above the workpiece, or pre-
position immediately to workpiece depth. If required, switch on
the spindle/coolant
5 Move to the contour
6 Machine the contour
7 Leave the contour
8 Retract the tool, end the program
Further information on this topic:
„ Contour programming: See "Tool movements" on page 166
Recommended program layout for simple cycle programs
1 Call tool, define tool axis
2 Retract the tool
3 Define the fixed cycle
4 Move to the machining position
5 Call the cycle, switch on the spindle/coolant
6 Retract the tool, end the program
Further information on this topic:
„ Cycle programming: See User’s Manual for Cycles
Example: Layout of contour machining programs
%BSPCONT G71 *
N10 G30 G71 X... Y... Z... *
N20 G31 X... Y... Z... *
N30 T5 G17 S5000 *
N40 G00 G40 G90 Z+250 *
N50 X... Y... *
N60 G01 Z+10 F3000 M13 *
N70 X... Y... RL F500 *
...
N160 G40 ... X... Y... F3000 M9 *
N170 G00 Z+250 M2 *
N99999999 BSPCONT G71 *
Example: Cycle program layout
%BSBCYC G71 *
N10 G30 G71 X... Y... Z... *
N20 G31 X... Y... Z... *
N30 T5 G17 S5000 *
N40 G00 G40 G90 Z+250 *
N50 G200... *
N60 X... Y... *
N70 G79 M13 *
N80 G00 Z+250 M2 *
N99999999 BSBCYC G71 *