Siemens SINUMERIK 802D sl Programming And Operating Manual page 243

For non-tangential transitions (corners), the velocity can be reduced rapidly enough so that
the axes are subject to a relatively high velocity change over a short period of time. This may
lead to a significant jerk (acceleration change). The size of the jerk can be limited by
activating the SOFT function.
Programming example
N10 G64 G1 Z... F...
N20 Y..
...
N180 G60 ...
Look-ahead velocity control:
In the continuous-path control mode with G64, the control system automatically determines
the velocity control for several NC blocks in advance. This enables acceleration and
deceleration across multiple blocks with approximately tangential transitions. For paths that
consist of short travels in the NC blocks, higher velocities can be achieved than without look
ahead.
Figure 10-26 Comparison of the G60 and G64 velocity behavior with short travels in the blocks
Surface grinding
Programming and Operating Manual, 11/2012, 6FC5398-5CP10-3BA0
; Continuous-path mode
; Continuous-path control mode continues to be active
; Switching over to exact stop
Programming
10.3 Axis movements
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