Nodding Compensation; Measuring Technique And Machine Data - Siemens SINUMERIK 840D sl Commissioning Manual

NC commissioning

8.5 Nodding compensation

8.5 Nodding compensation
8.5.1

Measuring technique and machine data

Benefits
The nodding compensation enhances precision for machining of the workpiece by
compensating for compliance within the machine and is beneficial for traveling column
machines, for example, in that it improves machining accuracy and surface quality.
Call the function at the control in the "Commissioning" → softkey "NC" → softkey "Nodding
compensation" operating area. The softkey is not shown until the option has been set.
Example
Nodding motion in the Z axis when accelerating in the X axis:
Definition of compliance
From the acceleration or deceleration of an axis as the cause for nodding - and the deviation
of an axis as compliance at the position - a factor can be determined, which describes the
interrelationship between the accelerating or decelerating axis motion, and the position
deviation in the compensated axis. No mass is included in the calculation. The compliance
factor is the inverse value of the stiffness.
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Software option
You need licenses for the following options in order to use this function:
● To tune a machine axis with a compensation relationship and position-
dependent adaptation:
"Nodding compensation ECO" (6FC5800-0_S20-0YB0)
● For the optimization of more than one compensation relationship:
"Nodding compensation ADVANCED" (6FC5800-0_S21-0YB0)
CNC Commissioning: NC, PLC, Drive
Commissioning Manual, 12/2019, A5E48312804B AA