Siemens SINUMERIK 840D sl Function Manual page 382

Compensations (K3)
Interpolatory compensation
To implement compensation, the compensation values of the X1 and Z1 axes must be
multiplied according to the following equation:
ΔX1 = Z1 * sinβ(X1) ≈ Z1 * β(X1)
Figure 5-11
Compensation table 1 (table index = 0) describes the reaction of axis X1 on axis X1 (sine of
the position-dependent tilting angle β(X1)).
Compensation table 2 (table index = 1) describes the reaction of axis Z1 on axis X1 (linear).
In table 1, the multiplication of table 1 (index = 0) with table 2 is to be selected:
$AN_CEC_MULT_BY_TABLE[0] = 2
Figure 5-12
Example: 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. Where such conditions
need to be met, 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 on the intersections of the grid (x-y plane). Compensation values between these
interpolation points are interpolated linearly by the control.
382
Table multiplication
Compensation of sag in a foundation
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions