Contour Accuracy, Cprecon, Cprecof - Siemens SINUMERIK 840DE Programming Manual

Path Action

5.7 Contour accuracy, CPRECON, CPRECOF

Note:The type of feedforward control and the path axes to which feedforward is to be applied
are determined via machine data.
Default: Velocity-dependent feedforward control
Option: Acceleration-dependent feedforward control (not possible with 810D)
Example
N10 FFWON
N20 G1 X... Y... F900 SOFT
5.7 Contour accuracy, CPRECON, CPRECOF
Function
In machining operations without feedforward control (FFWON), errors may occur on curved
contours as the result of speed-related differences between setpoint and actual positions.
The programmable contour accuracy CPRCEON makes it possible to store a maximum
permissible contour error in the NC program which must never be smoothed. The magnitude
of the contour error is specified with setting data $SC_CONTPREC.
The Look Ahead function allows the entire path to be traversed with the programmed contour
accuracy.
Programming
CPRECON
Or
CPRECOF
Parameters
CPRECON
CPRECOF
5-22
Activate programmable contour accuracy
Deactivate programmable contour accuracy
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals