Siemens SINUMERIK Series Function Manual page 253

Input of compensation values in a grid structure
The compensation values of the Z axis sag on flat bed machines are often measured in
practice at various points as a function of the X and Y coordinates. Under these
preconditions, it is useful to enter the measured compensation values according to a grid-
type distribution. The interpolation points with the relevant compensation values are
positioned at the intersections of the grid (X-Y plane). Compensation values between these
interpolation points are interpolated linearly by the control.
The following example explains in more detail how sag and angularity compensation can be
implemented by a grid of 4 x 5 (lines x columns) in size. The size of the whole grid is
2000 x 900 mm
the X axis and 300 mm along the Y axis.
Note
The following interdependencies apply for the maximum dimension of the grid (number of
lines and columns):
• The number of lines depends on the number of axes in the system (dependent on the
• The number of columns is dependent on the maximum number of values which can be
The number of lines and columns is set via the following machine data:
MD18342 $_MN_MM_CEC_MAX_POINTS (maximum number of interpolation points for sag
compensation)
Memory-configuring machine data
Settings made to the MD18342 machine data cause the non-volatile NC user memory to be
automatically re-allocated on system power-on. All the user data in the NC user memory
(e.g. drive and HMI machine data, tool offsets, part programs, etc.) is deleted.
Save the user data before setting the machine data.
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
. The compensation values are each measured in steps of 500 mm along
2
NCU type).
entered in a compensation table (up to a total of 2000 values).
CAUTION
K3: Compensations
4.4 Interpolatory compensation
253