Understanding Frequently Used Programming Instructions - Siemens SINUMERIK 808D User Manual

N o te
When you perform editing operations such as renumbering, searching, and saving of an external program file larger than
4 MB, a message appears reminding you that it will take a long time to complete the operations.
To ensure that the program editor works properly, you are recommended to edit an external program file smaller than
200 MB.
7.2.3

Understanding frequently used programming instructions

7.2.3.1 Inch or metric dimensions (G70/G71)
D e scription
G7 1 :
With G71 at the program start, both the geometrical data
and the feedrates are evaluated as metric units.
G7 0 :
With G70 at the program start, the geometrical data is eval-
uated as inches, but the feedrates are not affected and
remain as metric units.
For more information, see Section "Dimensions in metric units and inches: G71, G70, G710, G700 (Page 82)".
7.2.3.2 Definition of work offset (G54 to G59, G500, G90/G91)
D e scription
G5 00:
All absolute path data corresponds to
the current position. The position val-
ues are written in the G500 (basic) zero
offset.
G5 4 to G59:
With G500 = 0, the offset for the work-
piece can be stored in the workpiece
offsets G54 to G59.
Programming and Operating Manual (Milling)
6FC5398-4DP10-0BA6, 09/2017
Programming example
N10 G17 G90 G54 G7 1
N20 T1 D1 M6
N30 S5000 M3 G94 F300
N40 G00 X1 00 Y100 Z5
N50 G01 Z-5
N60 Z5
N70 G00 Z5 0 0 D0
N10 G17 G90 G54 G7 0
N20 T1 D1 M6
N30 S5000 M3 G94 F300
N40 G00 X3 .93 Y3.93 Z5
N50 G01 Z-0 .787
N60 Z0 .196
N70 G00 Z1 9 .68 D0
Il lustration Programming example
N10 G17 G90 G5 0 0 G71
N20 T1 D1 M6
N30 S5000 M3 G94 F300
N40 G00 X5 0 Y50 Z5
N50 G01 Z-2 0
N60 Z5
N70 G00 Z5 0 0 D0
N10 G17 G90 G5 4 G71
N20 T1 D1 M6
N30 S5000 M3 G94 F300
N40 G00 X0 Y0 Z5
N50 G01 Z-2 0
N60 Z5
N70 G00 Z5 0 0 D0
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