Siemens SINUMERIK 828D Programming Manual page 415

Example 2: G751
Position X20 Z30 is to be approached first, followed by the fixed machine axis position 2.
Program code
...
N40 G751 X20 Z30 FP=2
...
Further information
G75
The axes are traversed as machine axes in rapid traverse. The motion is mapped internally
using the "SUPA" (suppress all frames) and "G0 RTLIOF" (rapid traverse motion with single-
axis interpolation) functions.
If the conditions for "RTLIOF" (single-axis interpolation) are not met, the fixed point is
approached as a path.
When the fixed point is reached, the axes come to a standstill within the "Exact stop fine"
tolerance window.
G751
The intermediate position is approached with rapid traverse and active offset (tool offset,
frames, etc.), and the axes move with interpolation. The next fixed-point approach is
executed as with
with
Additional axis movements
The following additional axis movements are taken into account at the point at which the
G75
● External work offset
● DRF
● Synchronization offset ($AA_OFF)
After this, the additional axis movements are not permitted to change until the end of
traversing is reached by the
Additional movements following interpretation of the
the fixed point accordingly.
The following additional movements are not taken into account, irrespective of the point at
which interpolation takes place, and will offset the target position accordingly.
● Online tool offset
● Additional movements from compile cycles in the BCS and machine coordinate system
Active frames
All active frames are ignored. Traversing is performed in the machine coordinate system.
Fundamentals
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
. Once the fixed point has been reached the offsets are reactivated (as
G75
).
G75
/ block is interpolated:
G751
Comment
; Position X20 Z30 is approached first in rapid
traverse as a path. Then the distance from X20 Z30 to
the second fixed point in the X and Y axis is
traversed, as with G75.
/ block.
G75 G751
Supplementary commands
14.5 Fixed-point approach (G75, G751)
/ block will offset the approach to
G75 G751
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