Programming principles
1.3 Axis movements
Turning Part 2: Programming (Siemens instructions)
50 Programming and Operating Manual, 05/2012, 6FC5398-5DP10-0BA0
1.3.12 Reference point approach: G74
Functionality
The reference point can be approached in the NC program with G74. The direction and
speed information of each axis is stored in the machine data.
G74 needs a separate block and is active based on the block mode. The machine axis
identifier must be programmed!
In the block after G74, the previous G command of the "Interpolation type" group (G0,
G1,G2, ...) is active again.
Programming example
N10 G74 X1=0 Z1=0
Remark: The programmed position values for X1, Z1 (here = 0) are ignored, but must still be
written.
1.3.13 Exact stop / continuous-path control mode: G9, G60, G64
Functionality
G functions are provided for optimum adaptation to different requirements to set the
traversing behavior at the block borders and for block advancing. For example, you would
like to quickly position with the axes or you would like to machine path contours over multiple
blocks.
Programming
G60 ; Exact stop, modal
G64 ; Continuous-path mode
G9 ; Exact stop, non-modal
G601 ; Exact stop window fine
G602 ; Exact stop window coarse
Exact stop G60, G9
If the exact stop function (G60 or G9) is active, the velocity for reaching the exact end
position at the end of a block is decelerated to zero.
Another modal G group can be used here to set when the traversing movement of this block
is considered ended and the next block is started.
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