Siemens SINUMERIK 840C - Manual (Page 966)

09.95 12 Functional Descriptions
12.19.5 Interpolation and compensation with tables
12.19.5 Interpolation and compensation with tables
The INTERPOLATION AND COMPENSATION WITH TABLES
(IKA and IKA stage 2) functions are available as options.
This function can be used to establish dependencies between an input quantity and an
associated output quantity.
Example of application of IKA:
Compensation of a hanging axis (machine-defining IKA)
The position of a (basic) axis can influence the absolute position of another (compensation)
axis without being detected by the measuring system. This influence can be compensated by
the "Interpolation and compensation with tables" function.
-Y
Z
Z
-Y
X
The further the machining head traverses in the negative Y direction, the more the cantilever
arm sags in the negative Z direction.
The Z value (output quantity) must therefore be corrected as a function of the current Y
position (input quantity). For this purpose, correction values for the Z axis are recorded for a
number of interpolation points of the Y axis and stored as a table in the control.
Example of application of IKA Stage 2:
Implementation of geometric profiles and velocities (workpiece-defining IKA)
If a workpiece has a complicated geometric profile (e.g. a cam shaft) which can only be
obtained by complicated, sophisticated DIN programming, the function IKA Stage 2 can be
used to break the profile down into interpolation points and to store the values of these points
in a table.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 12–191
SINUMERIK 840C (IA)