specifications) either via the setting data $SC_CONTPREC or via the programmed contour
tolerance CTOL. The smaller the value and the smaller the K
V
factor of the geometry axes, the
greater the path feedrate is reduced on curved contours.
The "Programmable contour accuracy" function is activated or deactivated via the operations
CPRECON and CPRECOF in the NC program.
Syntax
CPRECON
...
CPRECOF
Meaning
CPRECON:
G command call: Switch "Programmable contour accuracy" on
Effectiveness: Modal
CPRECOF:
G command call: Switch "Programmable contour accuracy" off
Effectiveness: Modal
Together CPRECON and CPRECOF form the G function group 39 (programmable contour
accuracy).
Note
The user can specify a minimum velocity for the path feedrate via the setting data
$SC_MINFEED (minimum path feedrate with CPRECON).
The feedrate is not limited below this value, unless a lower F value has been programmed or
the dynamic limits of the axes require a lower path velocity.
Note
The "Programmable contour accuracy" function only considers the geometry axes of the path.
It has no effect on the velocities of positioning axes.
Example
Program code Comment
N10 G0 X0 Y0
N20 CPRECON ; Activate the "programmable contour accuracy".
N30 G1 G64 X100 F10000 ; Machining with 10 m/min in the continuous-path
mode.
N40 G3 Y20 J10 ; Automatic feed limitation in circular block.
N50 G1 X0 ; Feedrate again without limitation (10 m/min).
...
Work preparation
3.14 Path traversing behavior
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0 845
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