K3: Compensations; Introduction - Siemens SINUMERIK 840D sl Function Manual

K3: Compensations

5.1

Introduction

Accuracy errors
The accuracy of machine tools is impaired as a result of deviations from the ideal geometry,
power transmission faults and measuring system errors. Temperature differences and
mechanical forces often result in great reductions in precision when large workpieces are
machined.
Compensation functions
Some of these deviations can usually be measured during commissioning and then
compensated for during operation on the basis of values read by the positional actual-value
encoder and other sensory devices. State-of-the-art CNC controls have compensation
functions that are active on an axis for axis basis.
Parameterization
These compensation functions can be set for each machine individually with axis-specific
machine data.
Activation
The compensations are active in all operating modes of the control as soon as the input data
are available. Any compensations that require the position actual value are not activated until
the axis reaches the reference point.
Position display
The normal actual-value and setpoint position displays ignore the compensation values and
show the position values of an ideal machine. The compensation values are output in the
"Diagnosis" operating area of the "Axis/Spindle Service" window.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
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